JPH0814401B2 - Operation control device for regenerative air conditioner - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a heat storage type air conditioner provided with a heat storage tank that stores ice as a heat storage medium, and particularly to measures for ice making during cold storage heat operation. It is about.

(Prior Art) In a heat storage type air conditioner that has been developed in recent years, various means have been developed so far, particularly as a means for setting the amount of ice generated as a heat storage medium in the summer.
As one example thereof, as disclosed in Japanese Patent Laid-Open No. 61-289249, there is one in which a target heat storage amount for nighttime heat storage operation is set based on an average value around the maximum load value on the previous day. That is, when the cooling load on the previous day was large, the cooling load on the next day is also often large.Therefore, by setting a large night heat storage amount, a large amount of ice is generated and stored in the heat storage tank during the night heat storage operation. The stored heat is contributed to the cooling operation on the next day to improve the cooling capacity of the air conditioner. On the contrary, when the cooling load on the previous day was small, the cooling load on the next day is often small, so by setting the night heat storage amount to a small value, the amount of ice generated in the heat storage tank during night heat storage operation The amount of remaining ice after the cooling operation on the next day is reduced to secure the reference water level in the heat storage tank.

(Problems to be Solved by the Invention) However, the above-described conventional apparatus may not be able to obtain an optimum amount of heat storage when the cooling load greatly changes depending on the day. That is, when the cooling load on the previous day is small and the cooling load on the next day is large, the nighttime heat storage amount is small based on the cooling load on the previous day, so the heat storage amount that contributes to the cooling operation on the next day is insufficient. The cooling capacity of the air conditioner becomes insufficient.

In order to eliminate such a problem, it is possible to set the nighttime heat storage amount to a large value in advance, but in this case, if the daytime cooling load is small and the amount of defrosting is small, the residual ice in the heat storage tank If the amount of ice becomes large and there is residual ice over a long period of time, the decrease in water volume cannot be recognized, resulting in excessive ice making, which leads to deformation and damage of various equipment such as heat storage tanks and heat storage heat exchangers. Further, there is also a system in which the residual ice is forcibly thawed, but this is not preferable because it requires energy for thawing and thus causes energy loss.

Therefore, the present invention sets the required ice-making amount according to the outside air temperature, and determines the amount of ice-making during nighttime heat storage operation depending on the presence or absence of residual ice in the heat storage tank. The purpose is to obtain an operation control device for an air conditioner.

(Means for Solving the Problems) The solving means of the present invention for achieving the above object will be described below.

The invention according to claim (1), as shown in FIG. 1, is a compressor (1), a heat source side heat exchanger (3), and a main pressure reducing mechanism (6).
And a main refrigerant circuit (10) in which the use side heat exchanger (7) is sequentially connected by a refrigerant pipe (9), and a heat storage tank (11) for storing ice for cold storage heat, while the heat storage tank is provided. A heat storage heat exchanger (12) arranged in (11) and connected to the main refrigerant circuit (10) for exchanging heat between the refrigerant and ice;
It has a basic structure with the decompression mechanism for cold storage heat (14), and the liquid refrigerant condensed in the heat source side heat exchanger (3) during operation, at least during normal cooling operation, is the main refrigerant circuit (10).
It circulates so as to flow only in the main decompression mechanism (6), is evacuated in the utilization side heat exchanger (7) and returns to the compressor (1), and during the cold storage heat operation, the heat source side heat exchanger (3). ), The liquid refrigerant condensed in) is reduced in pressure by the cold storage heat decompression mechanism (14), circulates so as to evaporate in the heat storage heat exchanger (12) and then returns to the compressor (1). After the liquid refrigerant condensed in the side heat exchanger (3) is supercooled in the heat storage heat exchanger (12) from the main refrigerant circuit (10), the use side heat exchanger (7) of the main refrigerant circuit (10) The heat storage type air conditioner is provided with a switching means (51) for switching the circuit connection so as to evaporate and return to the compressor (1).

Then, the outside air temperature detecting means (Tha) for detecting the outside air temperature
And a residual ice detection means (Th) for detecting residual ice in the heat storage tank (11).
w) and the outside air temperature detection means (T
The ice-making amount calculation means (6) that estimates the outside air temperature during the cold storage heat recovery operation by calculating the outside air temperature detected by ha) and calculates the required ice-making amount during the cold storage heat operation based on this.
1) and the residual ice detection means (Thw) detect residual ice in the heat storage tank (11), the correction means (62) for reducing and correcting the calculated ice making amount of the ice making amount calculating means (61), and the ice making amount calculation A cold storage heat control means (60) for controlling the operation during cold storage heat so that predetermined ice is made in the heat storage tank (11) in response to the output signals of the means (61) and the correction means (62). ing.

The invention according to claim (2) is the operation control device of the heat storage type air conditioner according to claim (1), wherein the correction means (62) is based on the required ice making amount calculated by the ice making amount calculating means (61). The required amount of ice making is reduced and corrected with a predetermined reduction rate, and when the remaining ice detecting means (Thw) continuously detects the remaining ice during each ice making, the reduction rate is gradually increased from the required amount of ice making. Residual ice detection means (Thw) while changing the rate
Is configured to return the reduction rate to zero when no residual ice is detected.

The invention according to claim (3) is based on the above claim (1).
Similar to the operation control device of the heat storage type air conditioner according to the described invention, the outside air temperature detecting means (Tha) for detecting the outside air temperature.
According to the outside ice temperature detection means (Thw) that detects the presence or absence of residual ice in the heat storage tank (11) at each start of the cold storage heat operation, and the outside air temperature detected by the outside air temperature detection means (Tha). Ice-making amount calculation means (61) for calculating the required ice-making amount during cold storage operation
When the remaining ice detecting means (Thw) detects that there is residual ice in the heat storage tank (11), the required ice making amount is calculated from the necessary ice making amount calculated by the ice making amount calculating means (61) at a predetermined reduction rate. When the remaining ice detection means (Thw) continuously detects that there is residual ice each time the cold heat storage operation is started, the reduction rate is changed so that the rate of decrease from the required ice making amount gradually increases. On the other hand, when the cold storage operation starts, the residual ice detection means (Thw)
Correcting means (62) for returning the reduction rate to zero when detecting that there is no remaining ice, and an ice making amount calculating means (61) and a correcting means (62).
And a cold storage heat control means (60) for controlling the operation during the cold storage heat so that a predetermined ice is produced in the heat storage tank (11) in response to the output signal of the above.

The invention according to claim (4) is the operation control device of the heat storage type air conditioner according to claim (3), wherein the ice making amount calculation means (61) is an outside air temperature detection means (Tha) during the cold storage operation. The outside air temperature detected during the cold storage heat recovery operation is estimated by calculating the outside air temperature detected by, and the required ice making amount during the cold storage heat operation is calculated based on the estimated outside air temperature.

(Operation) With the above configuration, in the invention of claim (1), the circuit connection is switched by the switching means (51), and the normal cooling operation, the cold storage heat operation, and the cold storage heat recovery operation are appropriately performed. Then, the outside air temperature during the cold storage heat recovery operation is estimated by calculating the outside air temperature detected by the outside air temperature detection means (Tha) during the cold storage heat operation, and based on this, the ice making amount calculation means (61) stores the cool air. Calculate the required amount of ice making during thermal operation. Then, when the residual ice in the heat storage tank (11) is detected by the residual ice detecting means (Thw), the necessary ice making amount is reduced and corrected by the correcting means (62). After that, the above-mentioned ice making amount calculation means (6
The output signals of 1) and the correction means (62) are the cold storage heat control means (6
0), the ice storage operation is performed under the control of the cold storage heat control means (60), and a predetermined amount of ice is stored. Therefore, the correction of the required amount of ice making by the correction means (62) suppresses the amount of ice making more than necessary, and if there is no residual ice, the amount of ice making is set only by the outside air temperature, so that the required amount of ice making is set. Is suppressed, and deformation and damage of the device due to the increase in the amount of remaining ice are avoided. In addition, the calculation of the required ice making amount is performed by estimating the outside air temperature during the cold storage heat recovery operation from the outside air temperature during the cold storage heat operation, so the outside air temperature is detected during the cold storage heat recovery operation and this outside air temperature is stored. Since a storage means for storing until the time of thermal operation is not required, the signal processing operation and the signal processing circuit can be simplified.

According to the invention of claim (3), the necessary ice making amount is reduced and corrected at a predetermined reduction rate from the necessary ice making amount calculated by the ice making amount calculating means (61), and the residual ice detecting means (Thw) is provided at each ice making time. When the residual ice is continuously detected, the decreasing rate is changed so that the decreasing rate from the required ice making amount is gradually increased, and the decreasing rate is returned to zero when the residual ice detecting means (Thw) does not detect the residual ice. As a result, the rate of decrease from the required ice-making amount will gradually increase until the remaining ice is exhausted, so heat recovery without residual ice will always occur, and an accurate required amount of ice-making that suppresses the remaining ice amount must be set. When the remaining ice is exhausted, a sufficient amount of ice can be obtained. Further, the residual ice detecting means (Thw) only detects the presence or absence of residual ice in the heat storage tank (11), and does not detect the amount of residual ice.
A detection means having a simple structure can be applied.

In the inventions of claims (2) and (4), the effects of the inventions of claims (1) and (3) described above can be obtained together. That is, it is possible to suppress the excess and deficiency of the required ice making amount, simplify the signal processing operation and the signal processing circuit, and obtain the optimum setting of the ice making amount by changing the reduction rate of the ice making amount.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings starting from FIG.

FIG. 2 shows the overall configuration of the air conditioner according to the present embodiment. A so-called multi-type air conditioner in which a plurality of indoor units (A), (B), ... Are connected to an outdoor unit (X). Is.

In the outdoor unit (X), (1) is a compressor,
(2) is a four-way switching valve that switches during cooling operation as shown by the solid line in the figure, and during heating operation as shown by the broken line in the figure,
(3) an outdoor heat exchanger as a heat source side heat exchanger functioning as a condenser during a cooling operation and as an evaporator during a heating operation, and (4) adjusting a refrigerant flow rate during a cooling operation and depressurizing the refrigerant during a heating operation. (5) is a receiver for storing the condensed liquid refrigerant, and (8) is an accumulator for removing liquid components in the suction refrigerant.

On the other hand, each of the indoor units (A), (B), ... Has the same structure, and (6) functions as a pressure reducing mechanism during the cooling operation and is electrically driven indoors as the main pressure reducing mechanism that adjusts the refrigerant flow rate during the heating operation. The expansion valve (7) is an indoor heat exchanger as a utilization side heat exchanger that functions as an evaporator during cooling operation and as a condenser during heating operation.

And each said apparatus (1)-(8) is a refrigerant pipe (9).
A main refrigerant circuit (10) having a heat pump function of radiating the heat obtained by heat exchange with the outdoor air to the indoor air is formed, which are sequentially connected so that the refrigerant can flow.

Further, (Y) stores cold heat or warm heat by exchanging heat with the refrigerant flowing through the main refrigerant circuit (10), or the cold heat,
It is a heat storage unit for utilizing heat storage heat. In the heat storage unit (Y), (11) is a heat storage tank that stores water (W), which is a heat storage medium capable of storing cold heat and warm heat, (12)
Is a heat storage heat exchanger arranged in the heat storage tank (11) for exchanging heat between water (W) and the refrigerant, and the heat storage heat exchanger (12) and the main refrigerant circuit (10) are A first bypass portion (13a) and a second bypass passage (13) are provided between the outdoor electric expansion valve (4) and the liquid line (9a) between the indoor electric expansion valve (6).
By b), the refrigerant is communicatably connected in order from the indoor electric expansion valve (6) side. Then, in the first bypass passage (13a), a heat storage electric expansion valve (14) as a cold storage heat reducing mechanism for reducing the pressure of the refrigerant when storing cold heat in the water (W).
Is installed in the second bypass path (13b).
A first opening / closing valve (15) for opening / closing the bypass path (13b) is provided.

Further, the first on-off valve (1
5) The piping between the heat storage heat exchanger (12) and the main refrigerant circuit (1
The gas line (9b) of (0) is connected by a third bypass passage (13c) so that the refrigerant can flow therethrough, and the third bypass passage (13c) is connected to the second bypass passage (13c) for opening and closing the second passage. An on-off valve (16) is provided.

On the other hand, in the liquid line (9a) of the main refrigerant circuit (10), between the two joints of the first and second bypass passages (13a) and (13b), a flow rate for variably adjusting the flow rate of the refrigerant is provided. A control valve (17) is provided. That is, the switching means (51) for switching the circuit connection according to each operating state is the first opening / closing valve (1).
5), a second on-off valve (16), and a flow rate control valve (17), and these valves (15), (16) and (17) are controlled by a control signal output from a controller (C). Is configured.

Further, sensors are arranged in the main refrigerant circuit (10) and the like, (Thw) is arranged in the water of the heat storage tank (11),
The water temperature sensor (Tha) as a residual ice detecting means for detecting the presence or absence of residual water in the heat storage tank (11) by detecting the water temperature Tw, (Tha) is arranged at the air intake port of the outdoor heat exchanger (3), and temperature
An outside air temperature sensor as an outside air temperature detecting means for detecting Ta,
(Thi) is a cooling inlet sensor arranged on the upstream side of the junction of the liquid line (9a) with the second bypass passage (13b) during cooling operation, and (Tho) is the first bypass passage of the liquid line (9a). (Thd) is a suction outlet (9d), which is a cooling outlet sensor arranged on the downstream side at the time of cooling operation of the joint with (13a).
The suction pipe sensor for detecting the suction pipe temperature, (Sp) is arranged in the gas line (9b), and has a high pressure Tc during the heating cycle and a low pressure (suction pressure) during the cooling cycle.
The pressure sensor that detects Te, (Cl) is a water level sensor that is installed near the water surface in the heat storage tank (11) and detects the amount of ice making in the heat storage tank (11) by the vertical movement of the water surface during ice making. Yes, each is configured to output a detection signal to the controller (C).

Here, the opening / closing (or opening degree adjustment) of each valve and the circulation path of the refrigerant in each operation mode of the apparatus will be described based on FIGS. 3 to 11.

During normal cooling operation, as shown by the arrow in FIG. 3, the four-way switching valve (2) is switched as shown by the solid line in the figure, and the outdoor electric expansion valve (4), flow control valve (17), indoor electric expansion valve (6), ... are opened, and the other valves are all closed, and the refrigerant condensed in the outdoor heat exchanger (3) circulates only in the main refrigerant circuit (10). Expansion valve (6),
, And evaporates in each indoor heat exchanger (7), and returns to the compressor (1).

During the cold storage heat operation, as shown by the arrow in FIG. 4, the outdoor electric expansion valve (4), the flow control valve (17), the heat storage electric expansion valve (14) and the second opening / closing valve (16) are opened, and the indoor electric expansion is performed. The operation is performed with the valves (6), ... And the first on-off valve (15) closed, and the liquid refrigerant connected by the outdoor heat exchanger (3) bypasses the first bypass passage (13a). The flow is reduced by the heat storage electric expansion valve (14), evaporated in the heat storage heat exchanger (12), and circulated so as to return to the compressor (1). At that time, the heat storage heat exchanger (12) exchanges heat with the refrigerant to make water (W), which is a heat storage medium, into ice to store cold heat.

Further, this aeration apparatus is capable of performing normal cooling and simultaneous cold heat storage operation, and at the time of this simultaneous operation, as shown by the arrow in FIG. 5, the outdoor electric expansion valve (4) and the flow control valve (1
7), indoor electric expansion valve (6), ..., heat storage electric expansion valve (1
4) and the second opening / closing valve (16) are opened, the first opening / closing valve (15) is closed, and part of the liquid refrigerant condensed in the outdoor heat exchanger (3) flows through the main refrigerant circuit (10). , Indoor electric expansion valve (6),
Is depressurized and vaporized in the indoor heat exchanger (7), while the rest of the liquid refrigerant flows to the first bypass passage (13a) side,
Heat storage Heat exchanger (12) decompressed by heat storage electric expansion valve (14)
Evaporates at. Then, the refrigerant in the gaseous state merges in the gas line (9b) and circulates back to the compressor (1).

During the cold storage heat recovery operation using the cold heat stored in the cold storage heat operation, the outdoor electric expansion valve (4), the flow control valve (17), the indoor electric expansion valve (6),
The liquid refrigerant condensed in the outdoor heat exchanger (3) is operated with the heat storage electric expansion valve (14) and the first opening / closing valve (15) open and the second opening / closing valve (16) closed. Part of the refrigerant flows from the main refrigerant circuit (10) to the second bypass passage (13b) side, and is supercooled by heat exchange with water (W) (or ice) in the heat storage heat exchanger (12). While returning from the first bypass path (13a) to the main refrigerant circuit (10), the rest of the liquid refrigerant passes through the flow rate control valve (17) and remains in the liquid line (9) of the main refrigerant circuit (10).
a) flowing. After the merging, the pressure is reduced by the indoor electric expansion valves (6),..., The refrigerant is evaporated by the indoor heat exchangers (7),. At that time, the partial flow rate of the refrigerant is adjusted by adjusting the relative opening of the flow control valve (17) and the heat storage electric expansion valve (14), and is detected by the cooling inlet sensor (Thi) and the cooling outlet sensor (Tho). The subcooling degree of the refrigerant as the temperature ΔTl of the liquid refrigerant temperatures Tl1 and Tl2 is appropriately adjusted.

Next, in the normal heating operation, as shown by the arrow in FIG. 7, the four-way switching valve (2) is switched to the broken line side in the figure, and each indoor electric expansion valve (6), ..., Flow control valve (17). ), The outdoor electric expansion valve (4) is opened, and the operation is performed with all the other valves closed, and the discharge gas is condensed in the indoor heat exchangers (7), ... ), Is decompressed, evaporated in the outdoor heat exchanger (3), and then circulated so as to return to the compressor (1).

During the warm storage operation, as shown by the arrow in FIG. 8, the second opening / closing valve (16), the heat storage electric expansion valve (14), the flow control valve (1
7), the outdoor electric expansion valve (4) is opened, the indoor electric expansion valves (6), ..., The first opening / closing valve (15) are closed, and the operation is performed, and the discharge gas is the main refrigerant circuit (10). From the first bypass passage (13a) to the main refrigerant circuit (10) after being condensed by the heat storage heat exchanger (12). It is decompressed in 4), evaporated in the outdoor heat exchanger (3), and then circulated so as to return to the compressor (1). At that time, water (W) in the heat storage tank (11) is warmed by heat exchange with the refrigerant in the heat storage heat exchanger (12),
Insulation is stored.

During normal heating and warm storage heat simultaneous operation, as shown by the arrows in FIG. 9, each indoor electric expansion valve (6), ..., Second opening / closing valve (16), heat storage electric expansion valve (14), flow control valve ( 17), the outdoor electric expansion valve (4) is opened, the operation is performed with the first opening / closing valve (15) closed, and a part of the discharge gas is discharged from the main refrigerant circuit (1).
0) to the third bypass (13c) side,
While being condensed in the heat storage heat exchanger (12), the remaining part of the discharged gas flows through the main refrigerant circuit (10) and flows into each indoor heat exchanger (7),
... condensed. Then, after the two are merged, the pressure is reduced by the outdoor electric expansion valve (4), the refrigerant is evaporated by the outdoor heat exchanger (3), and then circulates back to the compressor (1).

Further, during the storage warming heat recovery defrost operation, as shown by the arrow in FIG. 10, the four-way switching valve (2) is switched to the solid line side in the figure, and the outdoor electric expansion valve (4), the flow control valve (17), Each indoor electric expansion valve (6), ..., Heat storage electric expansion valve (14), second
The operation is performed with the on-off valve (16) opened and the first on-off valve (15) closed, and the discharged gas is condensed in the outdoor heat exchanger (3), and a part of the condensed liquid refrigerant becomes the main refrigerant. The refrigerant flows from the circuit (10) to the first bypass passage (13a) by bypass, is decompressed by the heat storage electric expansion valve (14), and is evaporated by the heat storage heat exchanger (12), while the remainder of the liquid refrigerant is the main refrigerant. The pressure is reduced at each indoor electric expansion valve (6),... Of the circuit (10) and evaporated at each indoor heat exchanger (7),. Then, they are circulated so as to join each other in the gas line (9b) and return to the compressor (1).
At this time, the outdoor gas exchanger (3) is defrosted by the discharge gas (hot gas), and the condensation capacity of the outdoor heat exchanger (3) is increased by using the heat storage and warming heat of the heat storage tank (11). At the very least, the defrost operation time is reduced.

The feature of the present invention relates to the control of the ice making amount setting during the cold storage heat operation described above.

The controller (C) has an outside air temperature sensor (Tha)
Ice-making amount calculation means (61) for calculating the required ice-making amount based on the detection signal, the correction means (62) for correcting the necessary ice-making amount by the detection signal of the water temperature sensor (Thw), and the ice-making amount calculation means (61). ) And a cool storage heat control means (60) for controlling the compressor (1) and the like by an output signal of the correction means (62). Therefore, the configuration and action of this ice making amount control will be described based on the flowchart of FIG.

During cold storage heat operation starts, the ice making amount calculating means (61) detects the outside air temperature T _GN during thermal storage operation (night) by the outside air temperature sensor (Tha) in step S _1, the sensed night air temperature T _GN Based on the outside temperature T _GN during recovery operation (daytime)
The outside air temperature T _GD is estimated, and the required ice making amount iPFs is calculated based on the estimated outside air temperature. That is, the outside air temperature T _GN during the heat storage operation (night) is processed to calculate the required ice making amount iPFs suitable for the outside air temperature T _GD during the recovery operation (daytime). The relationship between the outside air temperature T _GD and the required ice-making amount iPFs during this recovery operation is generally as shown in the graph of FIG. 12, and the required ice-making amount iPFs calculated in this step S ₁ is based on this graph. It is obtained by the following equation set by

iPFs = c ₁ · T _GN + c ₂ …… In other words, the required ice-making amount i based on the night outside temperature T _GN without detecting the outside temperature T _GD during the actual recovery operation (daytime) i
It is designed to calculate PFs.

The required ice-making amount iPFs obtained here has a lower limit of 15% and an upper limit of 55%. The required ice making amount is expressed as a volume percentage in the heat storage tank.

The constants c ₁ and c ₂ in the above equation are set to values that take into consideration the conversion from the outside air temperature T _GN during the heat storage operation to the outside air temperature T _GD during the recovery operation. That is, this constant
By setting c ₁ and c ₂ as experimentally obtained values, the above formula is used to determine the necessary ice-making amount iPFs suitable for the outside temperature T _GD during the recovery operation (daytime) according to the outside temperature T _GN at night. You can get it. For example, the detected outside temperature T at night
_The constants c ₁ and c ₂ are set so that the required ice-making amount iPFs suitable for the temperature obtained by adding 8 ° C to _GN can be obtained. In other words, in this case, the temperature obtained by adding 8 ° C to the outside temperature T _GN at night becomes a pseudo value of the outside temperature T _GD during the day, and the required ice-making amount iPFs is calculated. The set values of the constants c ₁ and c ₂ differ depending on the room in which the cooling operation is performed. That is, in a room such as a computer room where the influence of the outside temperature is relatively small, it is set as shown by H in Table 1 and the graph of FIG. 12 below, while it is affected by the outside temperature. In an easy room, it is set as indicated by M.

As described above, in this example, the required ice-making amount is calculated by the outside air temperature T _GD during the cold storage heat recovery operation based on the outside air temperature T _GN during the cold storage heat operation.
Since it is performed while estimating the temperature, the outside temperature T _GD is detected during the cold storage heat recovery operation, and there is no need for a storage means such as storing this outside air temperature T _GD until the cold storage heat operation. The circuit can be simplified.

Next, when the required ice amount is calculated, the flow proceeds to step S _2, for detecting the presence or absence of the remaining ice in the thermal storage tank (11). Detection of this Zankori is carried out in a water temperature sensor which is arranged in the thermal storage tank (11) (Thw), and, if there is a remaining ice, the initial value is set to 0 in step S ₃ 2 for constant c
Is added and the process proceeds to step S ₄ . In step S ₄ , the necessary amount of ice making when there is residual ice is corrected by the correction means (62).
After reducing the required ice making amount obtained in S ₁ by 2% to obtain the actual ice making amount, in step S ₆ , the ice storage operation by the cold storage heat control means (60) is started. That is, if there is residual ice, a value obtained by subtracting 2% from the required amount calculated by the ice making amount calculation means (61) is set as the actual required amount, and heat storage operation is performed for this required amount. The value of the constant c is configured so that the value of the previous day is stored and carried over to the constant c of the next day. On the other hand, when there is no remaining ice in step S ₂ is ice-making operation while the step S ₆ of the required ice quantity obtained in Step S ₁ is cleared constant c to zero in step S _5.

Furthermore, by controlling the setting of the amount of ice making in this way,
The amount of ice making is controlled not only by the setting of the amount of ice making by the outside air temperature, but also by the presence or absence of residual ice in the heat storage tank. Therefore, the amount of ice making is reduced, that is, the reduction rate is integrated as 2, 4, 6, ...%, and when there is no residual ice, the reduction rate is cleared (c = 0), and the amount of ice making is calculated by calculating only the outside temperature. become. Therefore, instead of setting the amount of ice making only by the outside air temperature at the time of cold storage heat recovery of the day as in the past, control is controlled to some extent by the reduction rate of the required amount of ice making from several days ago, so the cooling load on every other day It is possible to obtain an optimum amount of cold storage heat even in a room where the temperature fluctuates, and it is possible to avoid damage to the equipment due to insufficient heat storage amount or a large amount of residual ice.

The heat storage operation control based on the outside air temperature and the residual heat storage amount as in the present invention can be applied to a cooling only machine. Also,
Although the water temperature sensor that detects the temperature in the heat storage tank is used as the residual ice detecting means in this embodiment, the presence or absence of residual ice may be detected by other means. Further, in the case of this example, the necessary amount of ice making is reduced and corrected depending on the presence or absence of residual ice, but it is configured so that the amount of residual ice can be detected, and the necessary amount of ice making is corrected to be reduced according to the amount of remaining ice. You may

(Effect of the invention) As described above, according to the invention of claim (1),
The outside air temperature during the cold storage heat recovery operation is estimated from the outside air temperature detected by the outside air temperature detection means during the heat storage operation, and the ice making amount calculation means calculates the required ice making amount based on this, while the residual ice detection means causes the heat storage tank When the residual ice in the inside is detected, the necessary ice making amount is corrected by the correcting means to be reduced, and the output signals of the ice making amount calculating means and the correcting means are sent to the cold storage heat control means, and the cold storage heat control means makes the ice making. Since the operation was controlled, the correction of the required amount of ice making by the correction means performed ice making in consideration of the remaining ice, suppressing unnecessary ice making, and when the remaining ice disappeared, only the outside temperature was reached. By setting the amount of ice making by, the excess and deficiency of the required amount of ice making is suppressed, and the reduction of the cooling capacity due to the shortage of the heat storage amount is avoided. In addition, since the generation of excess residual ice is reduced, the conventional means for forcibly thawing ice is not required, which not only simplifies the configuration and eliminates energy loss, but also increases the amount of residual ice. Deformation or damage of each device due to the situation is avoided. In addition, since it does not directly detect the outside air temperature during the cold storage heat recovery operation, it detects the outside air temperature during the cold storage heat recovery operation,
A storage means for storing the outside air temperature until the cold storage heat operation is not required. Therefore, the signal processing operation and the signal processing circuit can be simplified.

According to the invention of claim (3), the required ice-making amount is corrected to be reduced at a predetermined reduction rate from the required ice-making amount calculated by the ice-making amount calculating means, and the residual ice detecting means is continuously left at each ice making time. When ice is detected, the rate of decrease is changed so that the rate of decrease from the required ice-making amount increases sequentially. It is possible to set an accurate required amount of ice making while suppressing the amount of ice. Also, if the residual ice detecting means does not detect the residual ice, the reduction rate is reset to zero.
When the remaining ice is exhausted, a sufficient amount of ice making can be obtained, and an insufficient amount of ice making can be avoided. Furthermore, the residual ice detecting means only detects the presence or absence of residual ice in the heat storage tank,
Since the amount of remaining ice is not detected, a detection means having a simple structure can be applied.

According to the inventions of claims (2) and (4), the effects of the inventions of claims (1) and (3) described above can be obtained together. That is, it is possible to suppress the excess and deficiency of the required ice making amount, simplify the signal processing operation and the signal processing circuit, and obtain the optimum setting of the ice making amount by changing the reduction rate of the ice making amount.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 12 show an embodiment of the present invention, FIG. 2 is a refrigerant piping system diagram showing the overall configuration of the apparatus, and FIGS. 3 to 6 are diagrams showing respective operation modes in the cooling operation, 3 is a normal cooling operation, FIG. 4 is a cold storage operation, FIG. 5 is a normal cooling and cold storage simultaneous operation, and FIG. 6 is an explanatory diagram showing refrigerant circulation in the cold storage recovery operation. 7 to 10 show each operation mode in heating operation, FIG. 7 is a normal heating operation, FIG. 8 is a heat storage / heat storage operation, and FIG. 9 is a normal heating and heat storage / heat storage simultaneous operation, and FIG. Figure is an explanatory diagram showing the circulation path of the refrigerant in the stored warm heat recovery defrost operation, Figure 11 is a flow chart showing the control contents of the controller, Figure 12 is the outside air temperature at the time of cool heat recovery, and the amount of cool heat suitable for it It is the figure which showed the relationship of. (1) Compressor (3) Outdoor heat exchanger (heat source side heat exchanger) (6) Indoor electric expansion valve (main decompression mechanism) (7) Indoor heat exchanger (use side heat exchanger) (9) Refrigerant piping (10) Main refrigerant circuit (11) Heat storage tank (12) Heat storage heat exchanger (14) Heat storage electric expansion valve (decompression mechanism for cold storage heat) (51) Switching means (60) Cold storage heat control means (61) Calculation of ice making amount Means (62) Correction means (Thw) Water temperature sensor (remaining ice detection means) (Tha) Outside air temperature sensor (outside air temperature detection means)

Claims (4)

[Claims] 1. A main refrigerant circuit in which a compressor (1), a heat source side heat exchanger (3), a main pressure reducing mechanism (6) and a use side heat exchanger (7) are sequentially connected by a refrigerant pipe (9). (10) and a heat storage tank (11) for storing ice for cold storage, while being arranged in the heat storage tank (11) and having the main refrigerant circuit (1
0), a heat storage heat exchanger (12) for exchanging heat between the refrigerant and ice, and a cold storage heat decompression mechanism (14) are provided, and the heat source side heat exchanger (at least during normal cooling operation). 3)
The liquid refrigerant condensed in circulates only in the main refrigerant circuit (10), is decompressed in the main decompression mechanism (6), evaporates in the utilization side heat exchanger (7), and circulates so as to return to the compressor (1). During the cold heat storage operation, the liquid refrigerant condensed in the heat source side heat exchanger (3) is decompressed by the cold heat decompression mechanism (14), evaporated in the heat storage heat exchanger (12), and then stored in the compressor (1). During the cold heat recovery operation, the liquid refrigerant condensed in the heat source side heat exchanger (3) is supercooled in the heat storage heat exchanger (12) from the main refrigerant circuit, and then circulates so as to return to the main refrigerant. Use side heat exchanger (7) of circuit (10)
A heat storage type air conditioner equipped with a switching means (51) for switching the circuit connection so as to evaporate at a temperature and return to the compressor (1), the outside air temperature detecting means (Tha) detecting an outside air temperature, and a heat storage tank. (11) Residual ice detection means (Thw)
And the outside air temperature during the cold storage heat recovery operation is estimated by calculating the outside air temperature detected by the outside air temperature detection means (Tha) during the cold storage heat operation, and based on this, the required ice making during the cold storage heat operation When the ice making amount calculating means (61) for calculating the amount and the remaining ice detecting means (Thw) detect the remaining ice in the heat storage tank (11), the correction for correcting the calculated ice making amount of the ice making amount calculating means (61) is reduced. A cold storage that controls the operation during the cold storage heat so that a predetermined ice is made in the heat storage tank (11) by receiving the output signals of the means (62), the ice making amount calculation means (61) and the correction means (62). An operation control device for a heat storage air conditioner, comprising: a heat control means (60). 2. The operation control device for a heat storage type air conditioner according to claim 1, wherein the correction means (62) has a predetermined reduction rate from the required ice making amount calculated by the ice making amount calculating means (61). Accordingly, the necessary ice-making amount is reduced and corrected, and when the remaining ice detecting means (Thw) continuously detects the remaining ice during each ice-making, the decreasing rate is changed so that the decreasing rate from the required ice-making amount increases sequentially. An operation control device for a heat storage type air conditioner, wherein the residual ice detecting means (Thw) is configured to return the reduction rate to zero when the residual ice is not detected. 3. A main refrigerant circuit in which a compressor (1), a heat source side heat exchanger (3), a main pressure reducing mechanism (6) and a use side heat exchanger (7) are sequentially connected by a refrigerant pipe (9). (10) and a heat storage tank (11) for storing ice for cold storage, while being arranged in the heat storage tank (11) and having the main refrigerant circuit (1
0), a heat storage heat exchanger (12) for exchanging heat between the refrigerant and ice, and a cold storage heat decompression mechanism (14) are provided, and the heat source side heat exchanger (at least during normal cooling operation). 3)
The liquid refrigerant condensed in circulates only in the main refrigerant circuit (10), is decompressed in the main decompression mechanism (6), evaporates in the utilization side heat exchanger (7), and circulates so as to return to the compressor (1). During the cold heat storage operation, the liquid refrigerant condensed in the heat source side heat exchanger (3) is decompressed by the cold heat decompression mechanism (14), evaporated in the heat storage heat exchanger (12), and then stored in the compressor (1). During the cold heat recovery operation, the liquid refrigerant condensed in the heat source side heat exchanger (3) is supercooled in the heat storage heat exchanger (12) from the main refrigerant circuit, and then circulates so as to return to the main refrigerant. Use side heat exchanger (7) of circuit (10)
A heat storage type air conditioner equipped with a switching means (51) for switching the circuit connection so as to evaporate at a temperature and return to the compressor (1), the outside air temperature detecting means (Tha) detecting an outside air temperature, and the cold storage heat. During the cold storage operation according to the remaining ice detection means (Thw) that detects the presence or absence of residual ice in the heat storage tank (11) at each start of operation, and the outside air temperature detected by the outside air temperature detection means (Tha) When the ice making amount calculating means (61) for calculating the required ice making amount and the remaining ice detecting means (Thw) detect that there is residual ice in the heat storage tank (11), the ice making amount calculating means (61) calculates The required ice-making amount is corrected with a predetermined reduction rate from the required ice-making amount, and when the residual ice detection means (Thw) continuously detects that there is residual ice, the required ice-making amount is calculated from the required ice-making amount. The change rate is changed so that the decrease rate of the Detection means (Thw)
When it detects that there is no residual ice, the correction means (62) that returns the reduction rate to zero, and the output signals of the ice making amount calculation means (61) and the correction means (62) are received and a predetermined amount is stored in the heat storage tank (11). An operation control device for a heat storage type air conditioner, comprising: a cold storage heat control means (60) for controlling an operation during cold storage heat so that ice is made. 4. The operation control device for a heat storage type air conditioner according to claim 3, wherein the ice making amount calculation means (61) comprises:
The outside air temperature during the cold storage heat recovery operation is estimated by calculating the outside air temperature detected by the outside air temperature detection means (Tha) during the cold storage heat operation, and the required ice-making amount during the cold storage heat operation is calculated based on this. An operation control apparatus for a heat storage type air conditioner, which is configured to: