JPH094883A - Air conditioning system - Google Patents

Abstract

PURPOSE: To provide an inexpensive air conditioning system capable of performing cooling operation while performing a heat accumulation by enabling both an ice making operation and a cooling operation to be carried out with the same refrigerant. CONSTITUTION: An indoor side heat exchanger 1, an outdoor side heat exchanger 4 and a compressor 2 are connected through refrigerant pipes R1... to cause refrigerant of which phase can be changed into gas and liquid to be flowed. Bypass pipes B1, B2 are connected in parallel with the indoor side heat exchanger 1 at the refrigerant pipes R1... and concurrently a heat exchanger 5 is connected to the bypass pipes B1, B2 and then its heat exchanger 5 is provided with a heat accumulating tank 9. Along with this arrangement, a head difference sufficient to transfer the refrigerant of which phase is changed into liquid to the indoor side heat exchanger 1 is provided between the heat exchanging means 5 and the indoor side heat exchanger 1 so as to enable an ice making, a cooling with forced circulating flow of the refrigerant under an operation of the compressor 2 and a cooling under an automatic circulating flow of the refrigerant to be carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system that cools air while storing heat using nighttime electric power.

[0002]

2. Description of the Related Art As an air conditioning system as described above, there has conventionally been a system generally configured as shown in the overall system configuration diagram of the conventional example of FIG. In this conventional example, an ice making device 01 and an ice heat storage tank 02 for storing the ice made by the ice making device 01 are provided on the roof of a building, while the cooling coil 03, the heating coil 04, and the blower fan are provided in the interior of the building. And an indoor heat exchanger 06 having a heat exchanger 05.

A condenser 08 is connected to the ice heat storage tank 02 via a cold water pipe 07, a condenser 08 and a cooling coil 03 are connected via a cooling refrigerant pipe 09, and the condenser 08 and a cooling chamber are connected. The refrigerant that changes from gas to liquid with heat exchange in the condenser 08 and changes from liquid to gas with heat exchange in the cooling coil 03 is hermetically sealed across the coil 03 and the cooling refrigerant pipe 09. In addition, a head difference sufficient to transfer the refrigerant that has changed into a liquid phase to the cooling coil 03 is provided between the condenser 08 and the cooling coil 03. The cooling water is configured to naturally circulate and cool using cold water.

Further, in the exhaust heat recovery section of the ice making device 01, an evaporator 010 installed in the basement of the building is provided with a hot water pipe 011.
And the evaporator 010 and the heating coil 04 are connected via the heating refrigerant pipe 012, and the evaporator 010, the heating coil 04, and the heating refrigerant pipe 01 are connected.
2 is configured such that the refrigerant that changes from liquid to gas in phase with heat exchange in the evaporator 010 and that changes in phase from gas to liquid with heat exchange in the heating coil 04 circulates in a sealed state. In addition, a head difference sufficient to transfer the refrigerant that has changed into a liquid phase to the evaporator 010 is provided between the evaporator 010 and the heating coil 04, and the exhaust discharged along with the ice making in the ice making device 01 is provided. It is configured such that the refrigerant can be naturally circulated and heated by using hot water obtained by heat to perform heating. Cold water pipe 07 and hot water pipe 01
1 The piping configuration of each return side is omitted in the drawing.

[0005]

However, in the air conditioning system of the conventional example as described above, the refrigerant circuit is configured for ice making in the ice making device 01 in addition to the refrigerant circuit for natural circulation. There is a drawback in that the number of pipes forming the refrigerant circuit is large. Further, in the indoor heat exchanger 06, it is necessary to provide the cooling coil 03 and the heating coil 04 dedicated for cooling and heating, respectively, to form a four-tube structure, and the indoor heat exchanger 06 becomes expensive, and In order to take out hot water, a large-scale piping structure and a pump from the roof of the building to the basement and the like are required, which makes the system expensive and the entire system has a drawback.

The present invention has been made in view of the above circumstances, and the air conditioning system according to the first aspect of the present invention makes it possible to perform the ice making operation and the cooling operation with the same refrigerant to store heat. While aiming to be able to build an air conditioning system that performs cooling, etc. at low cost,
The air conditioning system of the invention according to claim 2 aims at downsizing the compressor and the heat storage tank so that the cost can be further reduced, and the air conditioning system of the invention according to claim 3 has a simple configuration. The air conditioning system of the invention according to claim 4 is divided into an interior zone and a perimeter zone, and air-conditioning is achieved. The purpose is to be able to comfortably perform.

[0007]

In order to achieve the above-mentioned object, an air conditioning system according to a first aspect of the present invention includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, and a gas. And a liquid via a refrigerant pipe for flowing a phase-changeable refrigerant, to the refrigerant pipe, while connecting the bypass pipe in parallel with the indoor heat exchanger, the heat exchange means to the bypass pipe, A heat storage tank is attached to the heat exchanging means, and between the heat exchanging means and the indoor heat exchanger, a head difference sufficient to transfer the refrigerant phase-changed to a liquid to the indoor heat exchanger is provided, and An ice-making operation state in which a low-temperature refrigerant that has passed through an outdoor heat exchanger from a compressor is supplied to the heat exchange means to make ice and the ice produced is stored in a heat storage tank, and a low-temperature refrigerant that passes through the outdoor heat exchanger from the compressor Air conditioner that supplies the heat to the indoor heat exchanger When, constituting includes a refrigerant flow path switching means for switching the heat storage cooling operation state to natural circulation flow of the refrigerant across the heat exchange means and the indoor heat exchanger.

Further, the air conditioning system of the invention according to claim 2 is the same as that of claim 1 in order to achieve the above object.
In the air conditioning system of the invention according to the invention, the low-temperature refrigerant that has passed through the outdoor heat exchanger from the compressor, and the low-temperature refrigerant that has been condensed and liquefied by the heat exchange means are combined and supplied to the indoor heat exchanger. It can be switched to and.

In order to achieve the above-mentioned object, the air conditioning system of the invention according to claim 3 is the same as that of claim 1.
Alternatively, a hot water heat storage operation state in which hot water is supplied from the outdoor heat exchanger through the compressor to the heat exchange means to obtain hot water and the hot water is stored in the heat storage tank, and the compressor With this, it is possible to switch to the heat storage heating operation state in which the refrigerant is supplied from the heat exchange means to the indoor heat exchanger.

In order to achieve the above-mentioned object, the air conditioning system of the invention according to claim 4 is characterized by
The refrigerant pipe in the air conditioning system according to any one of items 1 to 3 is composed of first and second refrigerant pipes that are parallel to the compressor, the outdoor heat exchanger, and the bypass pipe, and is installed in the perimeter zone. The first indoor heat exchanger is connected to the first refrigerant pipe, and the second indoor heat exchanger installed in the interior zone is connected to the second refrigerant pipe.

[0011]

According to the structure of the air conditioning system of the present invention as defined in claim 1, the same refrigerant capable of phase change into gas and liquid is made to flow in the same refrigerant pipe and bypass pipe, and the flow path of the refrigerant. The ice making operation in which the refrigerant is forced to circulate and flow between the outdoor heat exchanger and the heat exchange means by the evaporation and condensation of the refrigerant, and the heat exchange means acts as an evaporator to store ice in the heat storage tank. A state, a cooling operation state in which the refrigerant is forcedly circulated over the outdoor heat exchanger and the indoor heat exchanger by the compressor to supply the refrigerant condensed and liquefied in the outdoor heat exchanger to the indoor heat exchanger, The ice stored in the heat storage tank causes the heat exchange means to act as a condenser to obtain a heat storage cooling operation state in which the refrigerant naturally circulates and flows between the heat exchange means and the indoor heat exchanger.

Further, according to the configuration of the air conditioning system of the present invention as claimed in claim 2, when the cooling load is high, the refrigerant is forcedly circulated by the compressor to be supplied to the indoor heat exchanger and at the same time the heat exchange means is provided. The refrigerant can be supplied to the indoor heat exchanger by natural circulation.

According to the structure of the air conditioning system of the third aspect of the present invention, the compressor forcibly circulates the refrigerant between the outdoor heat exchanger and the heat exchange means, and the heat exchange means acts as a condenser. The hot water heat storage operation state in which the hot water obtained by this is stored in the heat storage tank, and the heat storage heating operation state in which the hot water in the heat storage tank is used to cause the heat exchange means to act as an evaporator to supply the high-temperature refrigerant to the indoor heat exchanger. And you can get

Further, according to the structure of the air conditioning system of the fourth aspect of the present invention, the cooling for each of the perimeter zone and the interior zone can be individually performed by the natural circulation flow or the forced circulation flow of the refrigerant.

[0015]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall system configuration diagram showing a first embodiment of an air conditioning system according to the present invention, in which a plurality of indoor side heat exchangers 1 ...
The suction side pipe R1 and the discharge side pipe R2 are connected via the four-way switching valve 3 and the first pipe R3, and
The four-way switching valve 3 and the outdoor heat exchanger 4 form the second pipe R4.
Connected through. The outdoor heat exchanger 4 and the indoor heat exchanger 1 ... Are connected to each other via a third pipe R5 in which a first expansion valve F1 and a second expansion valve F2 ... Are connected in series. . The refrigerant pipe is formed by the suction side pipe R1, the discharge side pipe R2, and the first, second and third pipes R3, R4 and R5.

The first expansion valve F1 in the third pipe R5
Between the second expansion valve F2 and the suction side pipe R
1 is connected to a third expansion valve F3 and a one-way valve C1 in parallel with each other and is connected via a first bypass pipe B1 having a first opening / closing valve V1. The heat exchange means 5 is provided in the bypass pipe B1 of the first bypass pipe B1, and the portion between the first on-off valve V1 of the first bypass pipe B1 and the heat exchange means 5 and the middle portion of the first pipe R3 are Second bypass pipe B with the second opening / closing valve V2 interposed
It is connected via 2. The thing consisting of the 1st bypass piping B1 and the 2nd bypass piping B2 is called a bypass piping.

A heat storage tank 9 is connected to the heat exchanging means 5 via a feed pipe 7 and a return pipe 8 having a pump 6 interposed therebetween, and the heat exchanging means 5 acts as an evaporator to produce ice. At the same time, the ice is stored in the heat storage tank 9, while hot water is obtained by operating the heat exchange means 5 as a condenser, and the hot water can be stored in the heat storage tank 9.

Although it is simplified in FIG. 1, the indoor heat exchanger 1 is, as shown in the schematic configuration diagram of FIG.
Inside the casing 10, the heat exchange coil 11 and the blower fan 1
2 is provided.

As the refrigerant, a refrigerant capable of changing the phase between liquid and gas is used, and the refrigerant that has changed to the liquid phase between the heat exchanging means 5 and the indoor heat exchanger 1 ... A head difference sufficient to transfer to the exchanger 1 ... Is provided, the refrigerant is naturally circulated and flows between the heat exchange means 5 and the indoor heat exchanger 1, and the ice stored in the heat storage tank 9 is used to heat the indoor heat. It is configured such that the exchanger 1 can perform cooling. In the above-mentioned embodiment, well-known constituent members such as a receiver for accumulating the refrigerant liquid, an accumulator, a suction heat exchanger, etc. provided for pressure adjustment are omitted. As the refrigerant, for example, harmless Freon gas R22 or Freon gas R134A containing no chlorine is used.

Although not shown in FIG. 1, as shown in the schematic configuration diagram of the main part of FIG. 2 (b), the connecting portion of the compressor 2, the suction side pipe R1 and the first bypass pipe B1. And a pressure sensor S for detecting the pressure in the suction side pipe R1, a controller C is connected to the pressure sensor S, and a controller for an electric motor M of a variable rotation speed type of the compressor 2. C is connected.

In the controller C, the pressure detected by the pressure sensor S is compared with the set pressure set by a pressure setter (not shown), and when the detected pressure is larger than the set pressure, the driver of the electric motor 15 ( An increase signal is output to (not shown) to increase the rotation speed, and when the detected pressure is smaller than the set pressure, a decrease signal is output to the driver (not shown) of the electric motor M to decrease the rotation speed. It is like this.

That is, in the refrigerant merging operation state, which will be described later, the controller C is automatically started to detect the evaporation amount of the refrigerant in the indoor heat exchangers 1 ... The rotation speed of the electric motor M is changed according to the pressure change, and the pressure of the refrigerant supplied to the heat exchange means 5 is controlled to be constant. However, the compressor 2 is stopped when the rotational speed is changed to be less than the set rotational speed.

Thus, when the cooling load is low, the compressor 2 is driven or stopped at a low rotation speed, while when the cooling load is high, the compressor 2 is driven at a high rotation speed, and the electric power consumption of the electric motor M is reduced. It is possible to cope with a case where the cooling load is high while saving the amount as much as possible.

With the above construction, the four-way switching valve 3 and the first and second on-off valves V1 and V2 are opened or closed artificially or automatically to operate the ice making operation, the ice making heating operation, and the heat storage cooling operation. State, cooling operation state, refrigerant merging / cooling operation state, hot water heat storage operation state, heat storage heating operation state, and heating operation state, respectively, which will be described below. 3 to 10, the white open / close valve is
The open state shows the state in which the refrigerant flows, while the black and white open / close valve shows the closed state (including the state in which the refrigerant does not substantially flow even in the open state) and the state in which the refrigerant does not flow. The four-way switching valve 3 and the first and second opening / closing valves V1 and V2 are referred to as a refrigerant flow path switching means.

(1) Ice-making operation state As shown in the system configuration diagram of FIG. 3, the first on-off valve V1
Open to close the second on-off valve V2, and then the compressor 2 → the discharge side pipe R2 → the four-way switching valve 3 → the second pipe R4 → the outdoor heat exchanger 4 → the part of the third pipe R5 → the second Bypass pipe B1
→ Heat exchange means 5 → First bypass pipe B1 → Part of suction side pipe R1 → Compressor 2 is circulated and circulated in order of refrigerant,
At night or the like, the night heat power is used to cause the heat exchanging means 5 to act as an evaporator to produce ice, and the ice is stored in the heat storage tank 9.

(2) Ice-making / heating operation state As shown in the system configuration diagram of FIG. 4, the first opening / closing valve V1
To open the second on-off valve V2 and the first expansion valve F1 and close the compressor 2 → discharge side pipe R2 → four-way switching valve 3 → first pipe R3 → indoor side heat exchanger 1 ... → third A part of the pipe R5 of the first → the first bypass pipe B1 → the heat exchange means 5 → the first bypass pipe B1 → a part of the suction side pipe R1 → the compressor 2 in order to circulate and flow the refrigerant and perform the heating operation. Make ice. That is, when there is a possibility of freezing in the outdoor heat exchanger 4 when the outdoor temperature is low in winter, when attempting a heating operation while sufficiently recovering heat in the outdoor heat exchanger 4, in the initial stage of operation, It is necessary to perform defrost operation for a long time, and during that defrost operation, cold air is blown on the indoor side heat exchangers 1 ... side, and further, defrost operation is required during the heating operation, Similarly, there is a problem that cold air is blown, but in such a case,
By performing the heating operation by operating the heat exchange means 5 as an evaporator, the defrost operation is unnecessary and the heating can be comfortably performed. Along with this, ice will be stored in the heat storage tank 9, but at night, it is sufficient to use nighttime electric power and operate at a temperature at which the outdoor heat exchanger 4 does not freeze to melt the ice. .

(3) Heat storage cooling operation state (natural circulation) As shown in the system configuration diagram of FIG. 5, the second on-off valve V2
To open the first on-off valve V1 and close the heat exchange means 5 → first
Bypass pipe B1 → part of third pipe R5 → indoor heat exchanger 1 ... → part of first pipe R3 → second bypass pipe B2 → first bypass pipe B1 → heat exchange means 5 The refrigerant is allowed to naturally circulate and flow in order, the ice stored in the heat storage tank 9 is supplied to the heat exchange means 5, the heat exchange means 5 acts as a condenser to liquefy the refrigerant, and the liquefied refrigerant is subjected to indoor heat exchange. Is supplied to the vessel 1 ... and evaporated in the indoor heat exchanger 1 ,.
The vaporized refrigerant is returned to the heat exchange means 5, and the cooling operation is performed by the natural circulation flow of the refrigerant.

(4) Cooling operation state (forced circulation) As shown in the system configuration diagram of FIG. 6, the first and second on-off valves V1 and V2 are closed, and the compressor 2 → the discharge side pipe R2 →
Four-way switching valve 3 → second pipe R4 → outdoor heat exchanger 4 → third pipe R5 → indoor heat exchanger 1 ... → first pipe R3 →
The refrigerant is forcibly circulated and flowed in the order of the four-way switching valve 3 → the suction side pipe R1 → the compressor 2, and the outdoor heat exchanger 4 acts as a condenser to perform the cooling operation.

(5) Refrigerant merging / cooling operation state (natural circulation and forced circulation) As shown in the system configuration diagram of FIG. 7, for example, when it is determined that the cooling load is high beforehand in summer, Open the second on-off valves V1 and V2, compressor 2 → discharge side pipe R2 → four-way switching valve 3 → second pipe R4 → outdoor heat exchanger 4 → third pipe R5 → indoor heat exchanger 1 ... → Part of the first pipe R3 → Second bypass pipe B2 → Part of the first bypass pipe B1 → Part of the suction side pipe R1 → Compressor in order of forced circulation of the refrigerant, A part of the refrigerant is supplied from the second bypass pipe B2 to the first bypass pipe B2.
1 part → heat exchange means 5 → first bypass pipe B1 → third pipe R5, and while cooling the liquid liquefied in the outdoor heat exchanger 4, it is cooled by a combination of natural circulation and forced circulation. Drive.

(6) Hot water heat storage operation state As shown in the system configuration diagram of FIG. 8, the second on-off valve V2
Open to close the first on-off valve V1, compressor 2 → discharge side pipe R2 → four-way switching valve 3 → part of the first pipe R3 → second bypass pipe B2 → first bypass pipe B1 → Heat exchange means 5 → first bypass pipe B1 → part of the third pipe R5 → outdoor heat exchanger 4 → second pipe R4 → four-way switching valve 3 →
The refrigerant is forcibly circulated and flowed in the order of the suction side pipe R1 → the compressor 2, and at night time, the night heat power is used to cause the heat exchange means 5 to act as a condenser to obtain hot water, and the hot water is stored in the heat storage tank 9. .

(7) Heat storage heating operation state As shown in the system configuration diagram of FIG. 9, the first on-off valve V1
Open to close the second on-off valve V2, and then the compressor 2 → discharge side pipe R2 → four-way switching valve 3 → first pipe R3 → indoor heat exchanger 1 ... → third pipe R5 → first Bypass pipe B1 → heat exchange means 5 → first bypass pipe B1 → part of suction side pipe R1 → compressor 2 is forcedly circulated and flowed in the order of compressor 2,
The heating operation is performed using the hot water stored in the heat storage tank 9.

(8) Heating operation state As shown in the system configuration diagram of FIG. 10, first and second
The on-off valves V1 and V2 of the compressor are closed, and the compressor 2 → the discharge side pipe R2
→ four-way switching valve 3 → first pipe R3 → indoor heat exchanger 1 ...
→ Third pipe R5 → Outdoor heat exchanger 4 → Second pipe R4
-> The four-way switching valve 3-> the suction side pipe R1-> the compressor 2 is forcibly circulated and flowed in order, and the outdoor heat exchanger 4 acts as an evaporator to perform heating.

FIG. 11 is a system configuration diagram showing a second embodiment of the air conditioning system according to the present invention. The differences from the first embodiment are as follows. That is, the first
The indoor heat exchangers 1 ... In the embodiment correspond to the first indoor heat exchangers 1a ... Installed in the interior zone, while the second indoor heat exchangers 1b ... Are installed in the perimeter zone. The second indoor heat exchanger 1b ... And a portion of the third pipe R3 between the outdoor heat exchanger 4 and the first expansion valve F1 are provided with a third opening / closing valve V3. Fourth pipe R
6, and a fourth opening / closing valve V4 is interposed between the fourth pipe R6 and the outdoor heat exchanger 4.

Further, the portion between the four-way switching valve 3 of the first pipe R3 and the second bypass pipe B2 and the second indoor heat exchanger 1b are connected via the fifth pipe R7. A fifth opening / closing valve V5 is interposed in the first pipe R3 between the connection point of the fifth pipe R7 and the connection point of the second bypass pipe B2.

In addition, the first bypass pipe B1 of the second bypass pipe B2 and the portion between the second bypass valve V2 and the first bypass pipe B1
Is connected via a sixth pipe R8 in which a sixth on-off valve V6 and a pressure adjusting valve 13 are interposed, and
A seventh opening / closing valve V7 is provided in the suction side pipe R1. The other configuration is the same as that of the first embodiment, and the same drawing number is assigned and the description is omitted. A first pipe R3 and a third pipe R5, which are connected in parallel to the first and second bypass pipes B1 and B2 and are connected to the first indoor heat exchanger 1a ... And is referred to as a first refrigerant pipe.
In addition, a configuration including a fourth pipe R6 and a fifth pipe R7 connected in parallel to the first and second bypass pipes B1 and B2 and connected to the second indoor heat exchanger 1b ... And is referred to as a second refrigerant pipe.

With the above structure, the four-way switching valve 3 and the first to seventh opening / closing valves V1, V2, V3, V4, V5, V
6 and V7 are artificially or automatically opened and closed to operate ice making operation, ice making heating operation state, heat storage cooling operation state, cooling operation state, heating operation state, heating / cooling operation state, hot water heat storage operation state, heat storage Each heating operation state can be obtained, which will be described below. 12 to 22, a white open / close valve indicates a state in which the refrigerant flows in the open state, while a black / white open / close valve includes a closed state (including a state in which the refrigerant does not substantially flow even in the open state). ) Indicates that the refrigerant does not flow. The four-way switching valve 3 and the first to seventh opening / closing valves V1, V2
A configuration including V3, V4, V5, V6 and V7 is referred to as a refrigerant flow path switching means.

(1) Ice-making operation state As shown in the system configuration diagram of FIG. 12, the first and the fourth
Open the on-off valves V1 and V4 of the compressor, compressor 2 → discharge side pipe R2
→ four-way switching valve 3 → second pipe R4 → outdoor heat exchanger 4 →
Part of the third pipe R5 → first bypass pipe B1 → heat exchange means 5 → first bypass pipe B1 → suction side pipe R5
Refrigerant is circulated in the order of part 1 → compressor 2, and at nighttime, night heat power is used to cause the heat exchange means 5 to act as an evaporator to produce ice, and the ice is stored in the heat storage tank 9. .

(2) Ice heating and heating operation state As shown in the system configuration diagram of FIG.
Open the on-off valves V1 and V3 of the compressor, and press the compressor 2 → discharge side pipe R2
→ four-way switching valve 3 → part of the first pipe R3 → fifth pipe R
7 → second indoor heat exchanger 1b ... → fourth pipe R6 → part of third pipe R5 → first bypass pipe B1 → heat exchange means 5 → first bypass pipe B1 → suction side pipe R1
Part of the compressor → the compressor 2 is circulated in order, the second indoor heat exchanger 1b ... Is made to act as a condenser, and before the dawn or the like, while making ice by using night power,
A heating operation is performed for the perimeter zone, that is, heat is stored in the body. In this case, the fifth on-off valve V5 can be opened to allow the refrigerant to flow through the first indoor heat exchangers 1a ... Also,
This operating state can also be applied when the outdoor temperature is low in winter and there is a possibility of freezing in the outdoor heat exchanger 4. The effect in this case is the same as that in the ice making heating operation state in the first embodiment.

(3) Heat storage cooling operation state (natural circulation) As shown in the system configuration diagram of FIG. 14, the second on-off valve V
2 is opened and the heat exchange means 5 → first bypass pipe B1 →
Part of the third pipe R5 → first indoor heat exchanger 1a ... →
Part of first pipe R3 → second bypass pipe B2 → first
Bypass pipe B1 → heat exchange means 5 is allowed to naturally circulate and flow, the ice stored in heat storage tank 9 is supplied to heat exchange means 5, and heat exchange means 5 acts as a condenser to liquefy the refrigerant. , The liquefied refrigerant to the first indoor heat exchanger 1a
Is supplied to the heat exchange means 5, and the vaporized refrigerant is returned to the heat exchange means 5, and the heat storage tank 9 is supplied.
Cooling operation is performed for the interior zone by the natural circulation flow of the refrigerant using the ice stored in.

As shown in the system configuration diagram of FIG. 15, the third and fifth on-off valves V3 and V5 are further opened, and the second indoor heat exchanger is exchanged in parallel with the first indoor heat exchanger 1a. Bowl 1
The refrigerant is also naturally circulated and flowed in b, and the ice stored in the heat storage tank 9 is used to perform the cooling operation also in the perimeter zone.

(4) Cooling operation state (natural circulation and forced circulation) Further, as shown in the system configuration diagram of FIG. 16, the second, third, fourth and seventh on-off valves V2, V3, V4, V7. , The refrigerant is naturally circulated to the first indoor heat exchanger 1a to perform the cooling operation for the interior zone, while the compressor 2 → the discharge side pipe R2 → the four-way switching valve 3 →
2nd piping R4-> outdoor heat exchanger 4-> 4th piping R6->
2nd indoor side heat exchanger 1b ...-> 5th piping R7-> a part of 1st piping R3-> four-way switching valve 3-> suction side piping R1 and a forced circulation flow of the refrigerant, and for the perimeter zone The refrigerant is forced to circulate and flow, and the cooling operation for the perimeter zone is performed.

(5) Cooling Operation State (Forced Circulation) In the case where the ice stored in the heat storage tank 9 is insufficient, as shown in the system configuration diagram of FIG. The fifth and seventh on-off valves V3, V4, V5, and V7 are opened, and the refrigerant liquefied from the compressor 2 through the outdoor heat exchanger 4 is passed through the third and fourth pipes R5 and R6, respectively. The first indoor heat exchanger 1a is supplied to the second indoor heat exchangers 1a, ..., 1b.
The first and fifth pipes R for the refrigerant vaporized in ...
3, the refrigerant is returned to the compressor 2 via R7, the refrigerant is forced to circulate and flow, and the outdoor heat exchanger 4 acts as a condenser to perform the cooling operation for the interior zone and the perimeter zone.

(6) Cooling operation state (forced circulation / body cooling heat storage) As shown in the system configuration diagram of FIG. 18, first, third, fourth, fifth and sixth on-off valves V1, V3, V4 , V5, V6
, And the liquefied refrigerant from the compressor 2 through the outdoor heat exchanger 4 is transferred to the first and second indoor heat exchangers 1a ..., 1b ... Via the third and fourth pipes R5 and R6, respectively. While supplying the refrigerant, the refrigerant vaporized in the first and second indoor heat exchangers 1a, 1b, ... Is connected to the first and fifth pipes R3 and R7 and the sixth pipe R8 to the second bypass pipe B2. Part → Part of the first bypass pipe B1 → Return to the compressor 2 via part of the suction pipe R1 to forcibly circulate the refrigerant, and perform outdoor heat exchange by using nighttime electric power before dawn The container 4 is operated as a condenser to perform cooling operation for the interior zone and the perimeter zone. Further, at the same time, by the action of the pressure adjusting valve 13 provided in the sixth pipe R8, a part of the refrigerant from the outdoor heat exchanger 4 is supplied to the heat exchange means 5 to perform ice making. As a result, both the body heat storage for preliminarily lowering the temperature of the body with inexpensive power and the heat storage of ice in the heat storage tank 9 can be performed, and the amount of ice stored in the heat storage tank 9 to cover the daytime cooling load is small. The heat storage tank 9 can be downsized, and the initial cost and running cost can be reduced.

(7) Heating operation state As shown in the system configuration diagram of FIG. 19, the third, fourth, fifth and seventh on-off valves V3, V4, V5 and V7 are opened, and the compressor 2 → the discharge side Pipe R2 → four-way switching valve 3 → first and fifth
Piping R3, R7 → first and second indoor heat exchangers 1
a ..., 1b ... → third and fourth pipes R5, R6 → outdoor heat exchanger 4 → second pipe R4 → four-way switching valve 3 → suction side pipe R1 → compressor in order of forced circulation of refrigerant It is made to flow and the outdoor heat exchanger 4 is made to act as an evaporator to perform the heating operation for the interior zone and the perimeter zone.

(8) Heating / Cooling Operation State When heating is performed in the perimeter zone in the winter, but there is a device such as a computer having a large heat radiation amount in the interior zone and cooling is required, as shown in FIG.
As shown in the system configuration diagram of No. 0, the first expansion valve F1 is closed and the second, third, fourth, and seventh on-off valves V2,
V3, V4, V7 are opened, and the heat exchange means 5 → first bypass pipe B1 → part of the third pipe R5 → first indoor heat exchanger 1a ... → part of the first pipe R3 → the first 2 bypass pipe B2 → first bypass pipe B1 → heat exchanging means 5 is allowed to naturally circulate and flow, and ice stored in heat storage tank 9 is supplied to heat exchanging means 5 by using night-time power to perform heat exchange. The means 5 is made to act as a condenser to liquefy the refrigerant, and the liquefied refrigerant is supplied to the first indoor heat exchangers 1a ... Downwardly to be evaporated in the first indoor heat exchangers 1a. The formed refrigerant is returned to the heat exchange means 5, and the ice stored in the heat storage tank 9 is used to perform the cooling operation for the interior zone by the natural circulation flow of the refrigerant. On the other hand, the compressor 2 → the discharge side pipe R2 → the four-way switching valve 3 → a part of the first pipe R3 → the fifth pipe R7 →
Second indoor heat exchanger 1b ... → Part of the fourth pipe R6 →
Part of the third pipe R5 → outdoor heat exchanger 4 → second pipe R4 → four-way switching valve 3 → suction side pipe R1 → compressor 2 is forced to circulate and flow in order of the outdoor heat exchanger. 4 acts as an evaporator to perform heating operation for the perimeter zone.

(9) Hot water heat storage operation state As shown in the system configuration diagram of FIG. 21, the second, fourth, fifth and seventh open / close valves V2, V4, V5 and V7 are opened, and the compressor 2 → discharge Side pipe R2 → four-way switching valve 3 → first pipe R3
Part → second bypass pipe B2 → first bypass pipe B1 → heat exchange means 5 → first bypass pipe B1 → part of third pipe R5 → outdoor heat exchanger 4 → second pipe R4 →
The four-way switching valve 3 → suction-side pipe R1 → compressor 2 is forced to circulate and flow in the order of night, and at nighttime, the night heat power is used to cause the heat exchange means 5 to act as a condenser to obtain hot water. Is stored in the heat storage tank 9.

(10) Heat storage heating operation state As shown in the system configuration diagram of FIG. 22, the first, third and fifth on-off valves V1, V3 and V5 are opened, and the compressor 2 → the discharge side pipe R2 → Four-way switching valve 3 → first and fifth piping R
3, R7 → first and second indoor heat exchangers 1a ..., 1
b ... → third and fourth pipes R5, R6 → first bypass pipe B1 → heat exchange means 5 → first bypass pipe B1 →
The refrigerant is forcibly circulated and flowed in the order of a part of the suction side pipe R1 → the compressor 2, and the heating operation is performed using the hot water stored in the heat storage tank 9.

In the above embodiment, the heat exchange means 5 and the heat storage tank 9
Are connected via a feed pipe 7 and a return pipe 8 with a pump 6 interposed therebetween. According to the present invention, as shown in the schematic cross-sectional view of the modified example of FIG. The heat exchange coil 5a may be directly provided in the heat storage tank 9a, and the feed pipe 7 and the return pipe 8 having the pump 6 may be omitted.

[0050]

As described above, according to the air conditioning system of the present invention as defined in claim 1, the compressor is forced to circulate and flow the refrigerant for the ice making operation and the cooling operation, and the refrigerant is naturally circulated. Each of the heat storage cooling operation states performed by flowing can be performed by a rational configuration in which the same refrigerant flows in the same refrigerant pipe and the bypass pipe. The number of pipes can be reduced as compared with the case where the refrigerant circuit for natural circulation is configured by separate refrigerant pipes, and it has become possible to inexpensively construct an air conditioning system that performs cooling while storing heat.

According to the air conditioning system of the second aspect of the present invention, when the cooling load is high such as in the summer, the ice stored in the heat storage tank is used by the night power and the compressor is driven to cool the refrigerant. Is supplied to the indoor heat exchanger by both natural circulation and forced circulation, the amount of ice stored in the heat storage tank can be small, so the heat storage tank can be downsized and compressed compared to the case of using only a compressor. The machine itself can also be made smaller and cheaper.

According to the air conditioning system of the third aspect of the present invention, when the heating load is high such as in the winter, hot water is stored in the heat storage tank by the night power, and the stored hot water is used for heating. In addition, by switching the flow path of the refrigerant, heating can be performed in the same indoor heat exchanger that is used for cooling, so the heat storage tank can be used not only for storing ice heat and hot water, but also for cooling and Compared with the conventional case in which a dedicated heat exchanger is provided for each heating, the number of refrigerant pipes can be reduced by half, and the simple configuration makes it cheaper, and heating can be performed while storing heat with hot water.

According to the air conditioning system of the fourth aspect of the present invention, the refrigerant is naturally circulated individually to the first and second indoor heat exchangers installed in the perimeter zone and the interior zone, respectively. Since it can be flowed or forcedly circulated, for example, while heating the perimeter zone in the winter, cooling can be performed in the interior zone equipped with heat dissipation equipment such as a computer, and air conditioning is comfortable. I can do it now.

[Brief description of drawings]

FIG. 1 is an overall system configuration diagram showing a first embodiment of an air conditioning system according to the present invention.

FIG. 2A is a schematic configuration diagram of an indoor heat exchanger, and FIG.
Is a schematic configuration diagram of a main part.

FIG. 3 is an overall system configuration diagram for explaining an ice making operation state of the first embodiment.

FIG. 4 is an overall system configuration diagram for explaining an ice making and heating operation state of the first embodiment.

FIG. 5 is an overall system configuration diagram for explaining a heat storage cooling operation state of the first embodiment.

FIG. 6 is an overall system configuration diagram for explaining a cooling operation state of the first embodiment.

FIG. 7 is an overall system configuration diagram for explaining a cooling operation state of the first embodiment.

FIG. 8 is an overall system configuration diagram for explaining a hot water heat storage operation state of the first embodiment.

FIG. 9 is an overall system configuration diagram for explaining a heat storage heating operation state of the first embodiment.

FIG. 10 is an overall system configuration diagram for explaining a heating operation state of the first embodiment.

FIG. 11 is an overall system configuration diagram showing a second embodiment of the air conditioning system according to the present invention.

FIG. 12 is an overall system configuration diagram for explaining an ice making operation state of a second embodiment.

FIG. 13 is an overall system configuration diagram for explaining an ice making and heating operation state of a second embodiment.

FIG. 14 is an overall system configuration diagram for explaining a heat storage cooling operation state of a second embodiment.

FIG. 15 is an overall system configuration diagram for explaining a heat storage cooling operation state of a second embodiment.

FIG. 16 is an overall system configuration diagram for explaining a cooling operation state of the second embodiment.

FIG. 17 is an overall system configuration diagram for explaining a cooling operation state of the second embodiment.

FIG. 18 is an overall system configuration diagram for explaining a cooling operation state of the second embodiment.

FIG. 19 is an overall system configuration diagram for explaining a heating operation state of the second embodiment.

FIG. 20 is an overall system configuration diagram for explaining a heating / cooling operation state of the second embodiment.

FIG. 21 is an overall system configuration diagram for explaining a hot water heat storage operation state of a second embodiment.

FIG. 22 is an overall system configuration diagram for explaining a heat storage heating operation state of a second embodiment.

FIG. 23 is a schematic cross-sectional view of a modified example.

FIG. 24 is an overall system configuration diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Indoor heat exchanger 1a ... 1st indoor heat exchanger 1b ... 2nd indoor heat exchanger 2 ... Compressor 3 ... Four way switching valve 4 ... Outdoor heat exchanger 5 ... Heat exchange means 9 ... Heat storage tank B1 ... First bypass pipe B2 ... Second bypass pipe R1 ... Suction side pipe R2 ... Discharge side pipe R3 ... First pipe R4 ... Second pipe R5 ... Third pipe R6 ... Fourth Piping R7 ... Fifth piping R8 ... Sixth piping

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Yoshitake 4-1-1-13 Honmachi, Chuo-ku, Osaka Stock Company Takenaka Corporation Osaka Main Store

Claims (4)

[Claims] 1. An indoor heat exchanger, an outdoor heat exchanger, and a compressor are connected via a refrigerant pipe through which a phase-changeable refrigerant flows between gas and liquid, and the chamber is connected to the refrigerant pipe. While connecting the bypass pipe in parallel with the inner heat exchanger, the heat exchange means is connected to the bypass pipe, a heat storage tank is attached to the heat exchange means, and the heat exchange means and the indoor heat exchanger In the meantime, a head difference sufficient to transfer the refrigerant phase-changed to a liquid to the indoor heat exchanger, and
An ice making operation state in which a low temperature refrigerant that has passed through the outdoor heat exchanger from the compressor is supplied to the heat exchanging means to make ice and the produced ice is stored in the heat storage tank, and the outdoor heat exchange from the compressor Flow path switching that switches between a cooling operation state in which low-temperature refrigerant that has passed through the heat exchanger is supplied to the indoor heat exchanger and a heat storage cooling operation state in which refrigerant naturally circulates and flows between the heat exchange means and the indoor heat exchanger An air conditioning system comprising means. 2. A refrigerant confluence from the compressor according to claim 1, wherein the low-temperature refrigerant passed through the outdoor heat exchanger and the low-temperature refrigerant condensed and liquefied by the heat exchange means are combined and supplied to the indoor heat exchanger. An air conditioning system that is configured to be switchable to a cooling operation state. 3. A hot water heat storage operation state in which hot water is supplied from the outdoor heat exchanger according to claim 1 through the compressor to the heat exchange means to obtain hot water, and the hot water is stored in a heat storage tank. And the heat storage heating operation state in which the compressor supplies the refrigerant from the heat exchange means to the indoor heat exchanger. 4. The refrigerant pipe according to claim 1, comprising a first refrigerant pipe and a second refrigerant pipe in parallel with the compressor, the outdoor heat exchanger, and the bypass pipe.
The first indoor heat exchanger installed in the perimeter zone is connected to the first refrigerant pipe, and the second indoor heat exchanger installed in the interior zone is connected to the second refrigerant pipe. Air conditioning system.