JPH0968366A - Air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit room cooling utilizing midnight power effectively by a method wherein a past cold heat storage level in a cold heat storage tank is stored and the starting time of using stored cold heat is determined in accordance with the past cold heat storage level upon employing the cold heat storage tank in the cooling on the day. SOLUTION: A cold heat storage level is detected by a temperature sensor 6b in a cold heat storage tank 6 and the detected cold heat storage level is stored in a CPU 9. When the stored cold heat storage level of a previous day is high, the CPU 9 judges that the temperature of previous day was not raised so much and the peak temperature of the day will be comparatively low and the starting of using stored cold energy (midnight power for example) is determined so 'as to be started from morning by the CPU 9 to control the stored cold heat energy so as to be consumed within the day. On the other hand, when the cold heat storage level of a previous day is low, the CPU 9 judges that the temperature of previous day was high and the peak temperature of the day will be comparatively high and determines the beginning time of using the cold heat storage energy as noon to prepare for the peak. According to this method, the cold heat storage energy can be employed effectively for cooling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs cooling and heating by performing heat exchange between a heat pump, a water heat exchanger and an air heat exchanger using a heat medium, and storing cold heat in a cold heat storage tank. It relates to the hot water supply / air conditioning system.

[0002]

2. Description of the Related Art Conventionally, there is a system that uses a heat pump (heat source) for air conditioning and hot water supply. Heat pump
It has a compressor (compressor) and an expansion valve inside, and uses a heat exchanger such as a water heat exchanger, an air heat exchanger, piping connecting these, and a CFC flowing in the piping. The direction is controlled by a valve installed on the pipe, and heat is released or absorbed to perform air conditioning or hot water supply.

[0003]

However, the above heat pump can utilize outside air or exhaust heat as a heat source,
Although it is a heat source with high energy-saving effect, there was no one who tried to use the night power effectively for cooling.

The present invention has been made in view of the above points, and an object of the present invention is to provide an air conditioning system for effectively utilizing nighttime electric power for cooling.

[0005]

The invention according to claim 1 is
A heat storage having a compressor, a heat pump, a water heat exchanger, and an air heat exchanger are connected by a first pipe, heat is exchanged by a heat medium flowing in the pipe, and cold heat is stored for cooling and heating. A heat tank, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, and cooling or air conditioning is performed by water or an antifreeze liquid flowing in the second pipe, and the operation of each device is controlled by a controller. In the air conditioning system configured to do, the control unit stores the past cold storage heat level in the cold storage heat storage tank, and when using the cold storage heat storage tank in cooling on the day, depending on the past cold storage heat level. It is characterized in that the use start time of the cold storage heat storage tank is determined.

A second aspect of the present invention is characterized in that, in the first aspect of the invention, the use start time of the cold storage heat storage tank is determined based on the cold storage heat level of the previous day.

According to a third aspect of the invention, in the first aspect of the invention, the use start time of the cold storage heat storage tank is determined based on the average value of the cold storage heat level in the past predetermined period. To do.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioning system showing an example of an embodiment of the present invention. 1 is a heat pump (heat source device), a compressor (compressor)
1a, expansion valve 1b, piping 1c, heat pump controller 1d, compressor controller 1e.
2 is a water heat exchanger on the hot water storage side, 3 is a water heat exchanger on the air conditioning side, and 4 is an air heat exchanger. Each exchanger and the heat pump 1 are connected by a pipe 1c. A heat medium such as CFC flows in the pipe 1c, and heat exchange is performed by compression, expansion, liquefaction, and vaporization of the heat medium, and functions such as cooling and heating and boiling water are performed. In addition, in this Embodiment, although the piping 1c is simplified and described for convenience,
Actually, the direction of the flow of the heat medium can be changed during cooling, heating or hot water storage, and the heat exchanger 2 used depending on the situation.
In order to change the combination of 4 to 4, a large number of valves are provided and the structure is complicated. The compressor controller 1e controls the inverter frequency of the compressor 1a.

Reference numeral 5 denotes a hot water storage tank, which is connected to the water heat exchanger 2 through a pipe 18 and performs a hot water storage operation with the heat pump 1 through the water heat exchanger 2. In the heat pump 1, a high-temperature and high-pressure heat medium is sent to the water heat exchanger 2 by the compressor 1a. On the hot water storage tank 5 side, water flowing through the hot water storage tank 5 and the pipe 18 is sent to the water heat exchanger 2 by the hot water storage pump 11. In FIG. 1, from the bottom of the hot water storage tank 5 to the hot water storage tank 5
The water inside is taken up by the hot water storage pump 11, and the valve 1
It is sent to the water heat exchanger 2 via 2. In the water heat exchanger 2,
The heat exchange with the high-temperature heat medium of the heat pump 1 is performed, and the water from the hot water storage tank 5 receives the heat here and becomes hot water, which is returned to the upper part of the hot water storage tank 5 and the hot water is stored in the hot water storage tank 5.
The valve 12 is a proportional valve for temperature adjustment, and is for controlling the amount of water flowing through the pipe 18 in order to keep the hot water produced at a constant temperature. That is, the outlet temperature of the hot water of the water heat exchanger 2 is detected by the sensor 12c, and the opening rate of the valve 12 is changed by the valve opening / closing controller 12a based on this information. For example, if the temperature of the hot water is lower than the set value, the outlet temperature of the water heat exchanger 2 is increased by decreasing the flow rate, and if the temperature of the hot water is higher than the set value, the outlet rate of the heat exchanger 2 is increased by increasing the flow rate. Try to lower the temperature. To use the hot water, the hot water is taken out from the upper part of the hot water storage tank 5 in FIG.
The hot water temperature during use is adjusted by mixing with the tap water 22. Then, a pumping pump 25 is provided as needed to send hot water to a faucet 26 in a sink 27, a bathtub, a wash basin 27 or the like. Here, the amount of hot water used in the hot water storage tank 5 is constantly supplied from the water supply 22 connected to the lower portion of the hot water storage tank 5. In addition, the water shutoff valve 2 between the water supply 22 and the hot water storage tank 5
No. 3 is normally open.

Next, the air conditioning operation will be described. In the air conditioning operation, heat energy is exchanged between the heat pump 1, the cold storage tank 6 and the air conditioner (fan coil unit: FCU) 7 via the water heat exchanger 3. First, the operation during cooling will be described. In the heat pump 1, the heat medium atomized at low pressure by the expansion valve 1b is sent to the water heat exchanger 3. On the air conditioning side where the cold storage heat storage tank 6 is provided, the cold storage heat storage tank 6, the pipe 19,
The water flowing through the mixing tank 21 (however, the inside of the cold storage heat tank 6 needs to be kept at 0 degrees or less during cooling, and an antifreeze liquid (brine water) is used here) is sent to the water heat exchanger 3 on the air conditioning side. In the water heat exchanger 3, the atomized heat medium takes heat from the brine water in the pipe 19 and vaporizes it. As a result, the brine water in the pipe 19 is cooled. Is the cooled brine water once stored in the cold storage tank 6?
Alternatively, it is directly sent to the mixing tank 21. The mixing tank 21 further includes an FCU 7 and pipes 19a, 19b and F.
A CU pump 15 is provided, and cold water is sent from the pipe 19a to the FCU 7 by the pump 15 and allowed to cool,
The warmed water returns to the mixing tank 21 through the pipe 19b. In the mixing tank 21, the water heat exchanger 3 and the cold storage heat tank 6
The brine water on the FCU 7 side is mixed with the brine water on the FCU 7 side, and the brine water sent to the FCU 7 side is obtained by mixing the cooling water directly from the water heat exchanger 3 or the cooling water from the cold storage heat tank 6. Is cooled to an appropriate temperature and cooled. Generally, the temperature of the brine water cooled by the water heat exchanger 3 is about -3 degrees, and the temperature of the water mixed in the mixing tank 21 and sent to the FCU 7 side is adjusted to about 5 to 7 degrees. Further, during cooling, since the bag 6a containing water in the cold storage heat tank 6 freezes below the freezing point, cold energy can be stored as latent heat. Switching from the water heat exchanger 3 directly to the mixing tank 21 or once storing in the cold storage heat tank 6, that is, switching between direct air conditioning and indirect air conditioning
The directional valve 13 is used.

In the FCU 7, cold water (brine water) sent through the pipe 19a is sent into the coil 7b. The room air 34 is sucked in through the intake port 7f by the fan 7a, passes through the coil 7b, and is again sent into the room through the blow port 7g. Here, the room air 34 is cooled when passing through the coil 7b cooled by cold water. The valve 7d is opened when used and closed when not used. In this way, by applying cooling energy to the air, the warmed brine water returns to the mixing tank 21, is mixed and cooled with the cooled brine water from the water heat exchanger 3 or the cold storage heat tank 6, and is again cooled. FCU by pump 15
Sent to 7.

On the other hand, during heating, the flow of the heat medium in the heat pump 1 is opposite to that during cooling, and the high-temperature heat medium from the compressor 1a is sent to the water heat exchanger 3 on the air conditioning side. As a result, the pipe 19 on the air conditioning side receives heat, and the hot brine water is sent to the FCU 7 for heating.
The other basic operations are the same as during cooling, so description will be omitted. In addition, the brine hot water at the time of heating is about 60 degrees, FCU
The water temperature sent to 7 is adjusted to about 45 degrees.

The control of the operation of each of the above devices is performed by the CPU 9 through the control line 10 based on the set value externally set by the control panel 8.
The CPU 9 has a storage function.

Reference numeral 28 is a room, 29 is a corridor, 30 is a ceiling, 31 is under the floor, 32 is a room ventilation port, and 33 is a central ventilation port.

According to the air conditioning system of the present embodiment, air conditioning and hot water supply can be performed by the same heat pump 1,
Since the hot water storage tank 5 is provided, the hot water produced can be stored. Since the cold storage heat tank 6 is provided, cooling energy can be stored in the summer and heating energy in the winter.

Here, in the present embodiment, the cold storage heat level is detected by the temperature sensor 6b in the cold storage heat tank 6, and the detected cold storage heat level is stored in the CPU 9. In summer, as shown in FIG. 2, for example, the peak temperature during the daytime is high from July to September, and operating the heat pump 1 during that time period consumes a lot of daytime electric power, which is not preferable. . Therefore, it is effective utilization of electric power to utilize the nighttime electric power by the cold energy storage tank 6 to generate ice in the cold energy storage tank 6 at night and use this cold energy for cooling during peak hours in the daytime. Is also desirable. Here, in order to correspond to the peak time of the daytime (12:00 to 17:00), the start time (melting start time of generated ice) is 1 when the cold storage tank 6 is used in cooling.
It is better to start from 2 o'clock. However, even if the peak temperature is low, if it is started from 12:00, the cold energy will not be used up and will be exhausted that day, which is not effective.

Therefore, in the control by the CPU 9, the stored cold storage heat level value of the previous day is used, and when the cold storage heat level of the previous day is high, it is determined that the temperature of the previous day does not rise so much and the peak temperature is relatively low on the day. , Start using the cold energy from the morning, and use the cold energy within the day. Further, when the cold storage heat level of the previous day is low, it is determined that the temperature of the previous day is high and the peak temperature of the day is relatively high, and the use start time of the cold storage energy is set to 12:00 to prepare for the peak time.

In the present embodiment, the use start time of the cold storage heat tank 6 is determined based on the cold storage heat level of the previous day, but the average value or the cold storage heat level of the cold storage heat level for the number of days in the past predetermined period is determined. The use start time of the cold storage tank 6 may be determined based on the tendency of the change. In this case, the peak temperature of the day is predicted from the average value of the cold storage heat level or the tendency of the change in the cold storage heat level to predict the cold storage heat tank 6
Will determine the start time of use. By doing so, even if the abnormal temperature only occurs on the previous day, it is possible to appropriately use the cold energy without misjudging the peak temperature of the day.

Therefore, in the air conditioning system of the present embodiment, the cold energy stored in the cooling can be effectively utilized.

In the present embodiment, the system capable of both hot water supply and air conditioning has been described, but it goes without saying that the present invention may be a system without hot water supply.

[0021]

As described above, according to the first aspect of the invention, the heat pump having the compressor, the water heat exchanger and the air heat exchanger are connected by the first pipe, and the heat flowing in the pipe is connected. In addition to performing heat exchange by a medium, a cool storage tank for storing cool heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, and the inside of the second pipe is Performing cooling and heating air conditioning by flowing water or antifreeze, in the air conditioning system to control the operation of each device by the control unit, in the control unit, stores the past cold storage heat level in the cold storage heat tank, When using the cold storage heat tank in the cooling on the day, the start time of use of the cold storage heat tank was determined according to the past cold heat storage level, so the nighttime electricity was used effectively to perform cooling. System There was able to be provided.

According to the invention of claim 2, in the invention of claim 1, the use start time of the cold storage heat tank is determined based on the cold storage heat level of the previous day. The peak temperature of the day can be predicted, and the cold storage tank can be used effectively during cooling.

According to the invention of claim 3, in the invention of claim 1, the use start time of the cold storage heat storage tank is determined based on the average value of the cold storage heat level in the past predetermined period. Even if only the previous day happened to be an abnormal temperature, the peak temperature of the day will not be predicted incorrectly,
When cooling, the cold storage heat storage tank can be effectively used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioning system showing an example of an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram according to the above.

[Explanation of symbols]

 1 Heat Pump 1a Compressor 1b Expansion Valve 1c Piping 1d Heat Pump Controller 1e Compressor Operating Frequency Controller 2 Water Heat Exchanger 3 Water Heat Exchanger 4 Air Heat Exchanger 5 Hot Water Tank 6 Cold Storage Heat Tank 7 FCU (Fan Coil Unit) 7a Fan 7b Coil 7c FCU controller 7d Open / close valve 7e FCU control panel 7f Inlet port 7g Blower port 8 Control panel 9 CPU 10 Control line 11 Hot water pump 12 Temperature proportional valve 12a Valve controller 12c Temperature sensor 13 Direct switching 3-way valve 13a Valve controller 14 Cold storage tank outlet valve 14a Valve controller 15 FCU pump 15a FCU pump controller 16 Ventilation fan 16a Ventilation fan controller 17 Heater Knit 17a Heater 17b Heater pump 17c Heater controller 18 Hot water storage side pipe 19 Air conditioning side pipe 19a FCU side forward pipe 19b FCU side return pipe 20 Circulation pump 20a Circulation pump controller 21 Mix tank 22 Water supply 23 Water stop valve 24 Mixing valve 25 For pumping Pump 26 Faucet 27 Sink, bathtub, washbasin, etc. 28 Room 29 Corridor 30 Ceiling 31 Underfloor 32 Room ventilation port 33 Central ventilation port 34 Indoor air 35 Indoor air 36 Air heat exchange air flow

Claims (3)

[Claims] 1. A heat pump having a compressor, a water heat exchanger, and an air heat exchanger are connected by a first pipe,
While performing heat exchange by the heat medium flowing in the pipe, a cool storage tank for storing cold heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, In the air conditioning system in which cooling and heating air conditioning is performed by water or antifreeze liquid flowing in the second pipe, and the operation of each of the devices is controlled by the control unit, the control unit controls the past cold storage heat level in the cold storage heat tank. The air conditioning system is characterized in that, when the cold storage heat tank is used for cooling on the day, the use start time of the cold storage heat tank is determined according to the past cold storage heat level. 2. The air conditioning system according to claim 1, wherein the use start time of the cold storage heat tank is determined on the basis of the cold storage heat level of the previous day. 3. The air conditioning system according to claim 1, wherein the start time of use of the cold storage heat tank is determined based on an average value of the cold storage heat level in a predetermined period in the past.