JPH05215490A - Air conditioner utilizing heat pump - Google Patents

Abstract

PURPOSE:To obtain an air conditioner in which a heat storage tank for holding water by various operations of a refrigerating display case device is used as a heat stored (heated) heat source or a cold source and the heat source of the tank can be utilized as room heating or cooling heat source of an indoor air conditioner. CONSTITUTION:The air conditioner utilizing a heat pump comprises a refrigerating display case device S1 and an indoor air conditioner S2. One end of a heat exchanger 4 in a store R, one end of a heat exchanger 2 installed out of room and one end of a heat exchanger 3 disposed in a heat storage tank 11 are connected to a discharge tube 1a of a first compressor 1 of the device S1. Further, one end of a heat exchanger 23 connected to an air conditioner in the store R, one end of a heat exchanger 21 installed out of room and one end of a heat exchanger 22 disposed in the tank 11 are connected to a discharge tube 20a of a second compressor 20 of the conditioner S2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a heat pump for heating and cooling in a sales floor in which a freezing showcase device for freezing an object to be frozen is arranged.

[0002]

2. Description of the Related Art Generally, a refrigerating showcase device arranged in a sales floor refrigerates by circulating a heat medium discharged from a compressor in a high temperature and high pressure state to a heat exchanger arranged in series in the device. It is known to use a refrigerating system that freezes a frozen material by causing a heat exchanger arranged inside a showcase to absorb heat. In addition, it is known that the air conditioning system installed in the sales floor uses a heat pump system, and there is a heat exchanger installed outside and a heat exchanger connected to the air conditioning equipment in the sales floor. In the meantime, the heat medium is reversibly circulated by the compressor, so that the heat exchanger in the room is operated as a radiator or a radiator to heat and cool the sales floor.

[0003]

By the way, the one shown in FIG. 2 shows the operating condition of the compressor used in the refrigeration showcase apparatus for one day. In this figure, since the refrigerating capacity during daytime (height of P) is extremely large compared to the operating state at midnight (height of Q), the running cost of the compressor was increased. Therefore, a large amount of electric power is required during the day, and it is necessary to equalize the operating state of the compressor and the electric power consumption during the day and night.

Further, in an air conditioner using a heat pump, there is a problem that the heating capacity becomes insufficient due to a decrease in the outside air temperature during the winter period and that it takes time to start the heating.

The present invention has been made in view of the above circumstances, and is a heat source in which a heat storage tank in which water is held by various operations of a freezing showcase device is stored (heated) or ice storage is stored. It is an object of the present invention to provide an air conditioner using a heat pump capable of using the heat source of the heat storage tank as a heat source for heating or cooling an indoor air conditioner.

[0006]

An air conditioner using a heat pump according to the present invention includes a heat storage tank and a heat exchanger arranged in a discharge pipe of a first compressor inside a refrigeration showcase in a sales floor. , One end of a heat exchanger installed outdoors, and one end of a heat exchanger disposed inside the heat storage tank are connected, and the other end of each of these heat exchangers is connected via an expansion valve to One end of a heat exchanger connected to the air conditioner in the sales floor, and a refrigeration showcase device connected to the suction pipe of the first compressor to reversibly circulate the heat medium, and to the discharge pipe of the second compressor. And one end of a heat exchanger installed outside the room and one end of a heat exchanger arranged inside the heat storage tank are connected, and the other end of each of these heat exchangers is connected to the second side via an expansion valve. An indoor air conditioner that reversibly circulates the heat medium by connecting to the suction pipe of the compressor It is an feature.

[0007]

According to the air conditioner using the heat pump of the present invention, the heat exchanger disposed inside the heat storage tank of the freezing showcase device is caused to absorb or radiate heat.
The water in the heat storage tank is used as a heated heat source or a cold heat source in which ice is stored.By using the heat source in the heat storage tank, running costs can be significantly reduced and the indoor air conditioner can be heated or cooled. Done.

Further, even if the heat absorption capacity of the heat exchanger installed outside the air conditioner is insufficient due to the decrease of the outside air temperature in the winter, and the heating capacity of the air conditioner in the sales floor is deteriorated, the air conditioner is also reduced. By using the heat source of the heat storage tank as the auxiliary heat source of the heating function, the shortage of heating capacity is solved, and further, the problem that it takes time to start heating is solved.

[0009]

EXAMPLES Examples of an air conditioner using a heat pump according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a schematic diagram of the present invention.

The present system is provided with a freezing showcase device S1 for freezing an object to be frozen, and an air conditioner S2 in a room (in a sales floor) in which the freezing showcase is installed.

The freezing showcase device S1 is the first
Compressor 1, heat exchangers 2, 3, 4, expansion valve 5, flow divider 7, first and second control valves, and third control valve 8,
9, 10 and the discharge pipe 1a of the first compressor 1,
A plurality of connecting pipes A, B, and C in which the first control valve 8, the heat exchangers 2, 3 and 4, and the expansion valve 5 are connected in series are connected. In addition, the expansion valve 5 side of these connecting pipes A, B, C is connected to a flow divider 7, and each connecting pipe A, B,
The diversion pipes D, E, and F equipped with the second control valve 9 are branched between the first control valve 8 of C and the heat exchangers 2, 3, and 4, and the suction pipe of the first compressor 1 is branched. It is connected to 1b. Also,
A branch pipe G in which the third control valve 10 and the check valve 6 are connected in series is connected to the expansion valve 5 side of the connection pipe A and the first control valve 8 side of the connection pipe B.

Of the heat exchangers 2, 3 and 4, the heat exchanger 2 is installed in the outdoor unit, and the heat exchanger 3 is installed inside the heat storage tank 11 storing water (hot water). .. Further, a plurality of heat exchangers 4 are arranged inside the showcase 12 in the sales floor. Further, inside the heat storage tank 11, a heater 30 that heats water by generating heat when energized is disposed.

The air conditioner S2 in the sales floor R has a second
Compressor 20, heat exchangers 21, 22, 23, expansion valve 24, flow divider 25, and fourth and fifth control valves 26, 27.
And a plurality of connecting pipes H, I, in which the fourth control valve 26, the heat exchangers 21, 22, 23, and the expansion valve 24 are connected in series to the discharge pipe 20a of the second compressor 20. J
Are connected. The expansion valves 24 of the connecting pipes H, I, and J are connected to the flow divider 25, and the first control valve 26 and the heat exchangers 21 and 2 of the connecting pipes H, I, and J are connected.
2 and 23, the branch pipes K, L, and M provided with the second control valve 27 are branched to draw the suction pipe 20 of the second compressor 20.
connected to b.

Of the heat exchangers 21, 22, 23,
The heat exchanger 21 is installed in the outdoor unit, and the heat exchanger 22 is
Like the heat exchanger 3 of the freezer showcase device S1, it is installed inside the heat storage tank 11 in which (hot water) is stored. Furthermore, the heat exchanger 23 is installed in the air conditioner in the sales floor. Next, the components of this embodiment will be specifically described.

First, the first and second compressors 1 and 20 are
It rotates at a predetermined frequency under the control of the inverters 15 and 28, compresses the heat medium, and pressure-feeds it from above to below. The heat medium discharged from this compressor 1 is
First and second control valves 8 and 9 and fourth and fifth control valves 2
The associated switching control of 6, 27 allows the heat exchangers 2, 3, 4, 21, 22, 23 to selectively act as heat sinks (coolers), heat radiators (heaters) or not. ing.

Next, the heat exchangers 2 and 21 installed outdoors
Is used as a heat absorber or radiator by heat exchange between the heat medium passing through the inside and the outside air.

Further, the heat exchangers 3 and 22 disposed inside the heat storage tank 11 have a structure in which the periphery is surrounded by a heat insulating material and water is stored therein. Ice-making is done. Also, hot water can be stored by the heat radiation operation. Further, the heat exchanger 4 arranged inside the showcase operates as a heat absorber to cool the object to be cooled displayed inside.

The expansion valves 5 and 24 are of the electronic type, and the heat exchangers 2, 3, 4, 21, 22, 2 are used.
It has a function of lowering the pressure of the heat medium passing through 3 through a narrow passage, and gradually and automatically adjusts the opening degree of the valve.

The flow dividers 7 and 25 are connected to the connecting pipes A,
One end of each of B, C, and H, I, and J is connected, and the heat medium that has passed through the heat exchanger that operates as a radiator is diverted toward the heat exchanger that operates as a heat absorber. Is becoming

Further, as the control valves 8, 9, 10, 26, 27, a flow rate control valve or the like which can continuously change the valve opening degree can be used. Next, regarding the extremely excellent function of the air conditioning system configured as described above, the heat exchangers 2, 3,
The heat absorption or heat dissipation operation of Nos. 4, 21, 22, and 23 will be described below. The description of the independent operation of the freezing showcase device S1 and the air conditioning device S2 is omitted.

(1) Heating function of air conditioner using only heat of heat storage tank This function is for heating the air conditioner by using only the heat source stored in the heat storage tank 11 in winter. As a method of storing a heat source in the heat storage tank 11, (a) a method using the operation of the freezing showcase device S1 and (b) a method using a midnight power heater can be considered. First, (a)
The heating operation of the air conditioner using the operation of the refrigeration showcase device will be described. In this case, the first control valve 8 of the connecting pipes A and C is closed, the first control valve 8 of the connecting pipe B is opened, and the second control valve 9 of the branch pipe E and the third control valve 8 are opened. The control valve 10 is closed and the second control valve 9 of the branch pipes D and F is opened. Further, the expansion valves 5 of the connecting pipes A, B and C are set to a predetermined opening. Further, the fourth control valve 26 of the connecting pipes H and I is closed, the fourth control valve 26 of the connecting pipe J is opened, and the fifth control valve of the branch pipes L and K is opened.
The control valve 27 is closed and the fifth control valve 27 of the branch pipe M is opened. Further, the expansion valve 2 of the connecting pipe J
4 is set to a predetermined opening.

As a result, the freezing showcase device S1
Is the outdoor heat exchanger 2 and the heat exchanger 4 of the showcase 12.
Operates as a heat absorber, and the heat exchanger 3 of the heat storage tank 11 operates as a radiator. The air conditioner S2 has a heat storage tank 11
The heat exchanger 22 disposed inside the unit operates as a heat absorber, and the heat exchanger 23 in the sales floor R operates as a radiator.

That is, the heat medium sent out from the first compressor 1 of the freezing showcase device S1 in a high temperature and high pressure state passes through the connecting pipe B and is condensed in the heat exchanger 3 of the heat storage tank 11 while being condensed with water. After heating by exchanging heat with the expansion valve 5
Is expanded under reduced pressure and flows into the heat exchangers 2 and 4. The heat medium flowing into the heat exchanger 4 exchanges heat with the air inside the showcase 12 to cool the object to be cooled. The heat medium passing through the heat exchanger 4 passes through the connecting pipe F, then passes through the connecting pipe 1b, and is fed into the compressor 1 again.

In the air conditioner S2, the heat medium is sent from the second compressor 20 to the heat exchanger 23 of the heat storage tank 11 and exchanges heat with the air in the sales floor R, so that the inside of the sales floor R is closed. Be heated. The heat medium whose pressure has been reduced by the thermal expansion valve 24 and which has passed through the flow divider 25 is transferred to the heat exchanger 2
After exchanging heat with the water heated in 2, that is, evaporating, the water passes through the connecting pipe 20b and is fed again to the second compressor 20.

As described above, in this operation, the heat in the heat storage tank 11 which has been stored (heated) by the operation of the freezing showcase device S1 is used for the air conditioner S2 to effectively perform heating. You can

Next, the heating operation of the air conditioner using the heat storage tank in which the heat source is stored by the midnight power of (b) will be described. In this case, the midnight power is supplied to the heater 30 to heat the water inside the heat storage tank 11 to a predetermined temperature. Then, during the daytime when the sales floor R is heated, the fourth control valve 26 of the connection pipes H and I of the air conditioner S2 is closed, the fourth control valve 26 of the connection pipe J is opened, and the branch pipe The fifth control valve 27 of L and K is closed, and the fifth control valve 27 of the branch pipe M is opened. Further, the expansion valve 24 of the connecting pipe J is set to a predetermined opening.

As a result, the heat exchanger 22 disposed inside the heat storage tank 11 operates as a heat absorber, and the heat exchanger 23 in the sales floor operates as a radiator. In this state,
In the air conditioner S2, the high-pressure and high-temperature gas heat medium from the second compressor 20 is sent to the heat exchanger 23. The heat medium exchanges heat with the air in the sales floor R, that is, it liquefies itself and radiates heat to heat the sales floor R. After that, the liquid heat medium is decompressed by the expansion valve 24 and flows into the heat exchanger 22, exchanges heat with the heated water in the heat storage tank 11, that is, absorbs heat and evaporates, and passes through the connecting pipes J and 20b. And is sent again to the second compressor 20.

As described above, in this function, the heat storage tank 11 is caused by the heat generating cord 30 that generates heat by using the midnight power.
Since a heat source can be obtained inside and this heat source can be used as a heating heat source for the air conditioner S2, the operating capacity of the second compressor 22 can be operated with a pump function. As a result, similarly to (1), it is possible to reduce the running cost by reducing the operating capacity of the second compressor 22.

(2) Heating operation of the air conditioner using the heat of the heat storage tank as an auxiliary heat source In this operation, the heat absorption capacity of the heat exchanger 21 installed outdoors is insufficient due to a decrease in the outside air temperature, and Due to this, the operation is performed when the heating capacity of the air conditioner S2 in the sales floor R is reduced. In this case, the first control valve 8 of the connecting pipes A and C is closed, the first control valve 8 of the connecting pipe B is opened, and the second control valve 9 of the branch pipe E and the third control valve 8 are opened.
The control valve 10 is closed and the second control valve 9 of the branch pipes D and F is opened. Furthermore, connecting pipes A, B, C
The expansion valve 5 is set to a predetermined opening.

Further, the fourth control valve 26 of the connecting pipes H and I
Is closed, the fourth control valve 26 of the connecting pipe J is opened, and the fifth control valve 27 of the branch pipe L is closed,
The fifth control valve 27 of the branch pipes M and K is opened. Further, the expansion valve 24 of the connecting pipe J is set to a predetermined opening. As a result, in the freezing showcase device S1, the outdoor heat exchanger 2 and the heat exchanger 4 of the showcase 12 operate as a heat absorber, and the heat exchanger 3 of the heat storage tank 11 operates as a radiator. In the air conditioner S2, the heat exchanger 21 installed outdoors operates as a main heat absorber, and the heat exchanger 22 arranged inside the heat storage tank 11 operates as a sub (auxiliary) heat absorber. Then, the heat exchanger 23 in the sales floor R operates as a radiator.

In this state, the heat medium sent out from the first compressor 1 of the refrigeration showcase device S1 in a high temperature and high pressure state passes through the connecting pipe B and is condensed in the heat exchanger 3 of the heat storage tank 11. After exchanging heat with water to heat it, the expansion valve 5
Is expanded under reduced pressure and flows into the heat exchangers 2 and 4. The heat medium flowing into the heat exchanger 4 exchanges heat with the air inside the showcase 12 to cool the object to be cooled. The heat medium passing through the heat exchanger 4 passes through the connecting pipe F, then passes through the connecting pipe 1b, and is fed into the compressor 1 again. On the other hand, the decompressed and expanded heat medium flowing into the heat exchanger 2 absorbs heat from the outside air while evaporating. And
The gaseous heat medium that has passed through the heat exchangers 2 and 4 is connected to the connecting pipe 1
After passing through b, it is sent to the compressor 1 again.

In the air conditioner S2, the second compressor 2
The heat medium having a temperature higher than 0 and a high pressure is sent to the heat exchanger 23 and exchanges heat with the air in the sales floor R to heat the sales floor R. Here, the heat medium that has passed through the heat exchanger 23 is sent to the heat exchangers 21 and 22.
The heat medium sent to No. 1 has a short heat absorption amount because the outside air is low in temperature, but the heat exchanger 22 sufficiently absorbs heat. Therefore, the heat exchanger 23 in the sales floor R always performs heating operation of a predetermined capacity. Is possible.

As described above, in this function, the heat source in the heat storage tank 11 stored by the operation of the freezing showcase device S1 is an auxiliary (sub) when heating the air conditioner S2.
Since it is used as a heat absorber, even if the heat absorption capacity of the heat exchanger 21 installed outside due to a decrease in outside air temperature decreases,
Insufficient heating capacity of the air conditioner S2 can be solved, and further, the problem that it takes time to start heating is solved.

(3) Cooling operation of the air conditioner using the heat quantity of the heat storage tank In this operation, ice as a cold heat source is produced inside the heat storage tank 11 in the summer (or spring and autumn) The cooling operation of the air conditioner is performed using the cold heat source (ice) stored in. Here, the operation described below is one in which ice is stored in the heat storage tank 11 at the same time as the normal operation of the freezing showcase device S1.

In this case, the freezing showcase device S1
Closes the first control valve 8 of the connection pipes B and C, opens the first control valve 8 of the connection pipe A, and opens the second control valve 9 and the third control valve of the branch pipe E. 10 is closed and the second control valve 9 of the branch pipes E and F is opened, and
The expansion valve 5 is set to a predetermined opening.

In the air conditioner S2, the fourth control valve 26 of the connecting pipes H and J is closed, the fourth control valve 26 of the connecting pipe I is opened, and the fifth pipe of the branch pipes M and K is opened. The control valve 27 of 1 is closed, and the fifth control valve 27 of the branch pipe L is opened. Further, the expansion valve 24 of the connecting pipe I is set to a predetermined opening.

In this state, the heat medium sent out from the compressor 1 in a high temperature and high pressure state passes through the connecting pipe A and is radiated to the outside air by the heat exchanger 2 installed outdoors, that is, condensed, and thereafter, By passing through the expansion valve 5, it is decompressed and expanded and flows into the heat exchangers 3 and 4. The heat medium flowing into the heat exchanger 4 exchanges heat with the air inside the showcase 12 to cool the object to be cooled. The heat medium passing through the heat exchanger 4 passes through the connecting pipe F, then passes through the connecting pipe 1b, and is fed into the compressor 1 again.

On the other hand, the decompressed and expanded heat medium that has flowed into the heat exchanger 3 exchanges heat with the water inside the heat storage tank 11 while evaporating, forming ice around the heat exchanger 3 inside the tank. Store ice. The gaseous heat medium that has passed through the heat exchangers 3 and 4 is
It is sent to the compressor 1 again through the connecting pipe 1b.

The air conditioner S2 has a second compressor 20.
The heat medium sent out in a high temperature and high pressure state from the connecting pipe I
After passing through, the heat is dissipated with the cold heat source of the heat storage tank 11, that is, the heat is condensed, and after passing through the expansion valve 24, it is decompressed and expanded and flows into the heat exchanger 23. The heat medium flowing into the heat exchanger 23 exchanges heat with the air in the sales floor to cool it. The heat medium that has passed through the heat exchanger 23 passes through the connecting pipe J, then passes through the connecting pipe 20b, and is fed into the second compressor 20 again.

As described above, in this operation, the cold heat source in the heat storage tank 11 obtained by the operation of the freezing showcase device S1 can be used as the cooling heat source of the air conditioner S2, thus reducing the running cost. Be promoted.
In the above operation, the nighttime electric power may be used to store ice in the heat storage tank 11 without operating the freezing showcase device S1.

As can be easily understood from the above description, in the present apparatus, the heat exchanger 3 arranged inside the heat storage tank 11 of the freezing showcase apparatus S1 is caused to absorb or radiate heat. The water in the heat storage tank 11 is used as a heated heat source or a cold heat source in which ice is stored. The heat source of the heat storage tank 11 is used to significantly reduce the running cost to heat or cool the indoor air conditioner S2. Can be done.

That is, when the air conditioner S2 is operated for heating in the winter, the heat source stored in the heat storage tank 11 by the operation of the freezing showcase device S1 shown in (1) (a), or (1) (b). 2) by using the heat source stored in the heat storage tank 11 by the midnight power shown in FIG.
Of the compressor 22 (reduction of the height of the compression capacity indicated by P in the daytime shown in FIG. 2) is achieved, and the operation state of the compressor and the power consumption can be equalized. it can.

Further, in winter, the heat absorption capacity of the heat exchanger 21 installed outdoors is insufficient due to a decrease in the outside air temperature,
Even when the heating capacity of the air conditioner S2 in the sales floor R is thereby reduced, as shown in (2), the heat source of the heat storage tank 11 is used as an auxiliary heat source for the heating function of the air conditioner S2. It is possible to solve the problem that heating capacity is insufficient and that it takes time to start heating.

In the summer (or spring / autumn),
By operating the freezing showcase device S1 to produce ice inside the heat storage tank 11 or by producing ice inside the heat storage tank 11 by using midnight power, this cold heat source (ice) is supplied to the air conditioner S2. Since it can be used as a cold heat source during the cooling operation of, the running cost of the system can be significantly reduced.

[0046]

As described above, in the air conditioner using the heat pump of the present invention, the heat exchanger disposed inside the heat storage tank of the refrigeration showcase device is caused to perform heat absorption operation or heat radiation operation, and the inside of the heat storage tank is operated. By using a heat source for heating water or a cold heat source for producing ice, the heat exchanger of the air conditioner installed separately from the heat exchanger of the freezer showcase device in the heat storage tank is operated to radiate or absorb heat, As a result, the operating capacity of the second compressor of the air conditioner can be reduced to achieve a system with significantly reduced running costs, and power consumption during the day and at night can be leveled.

Therefore, it is possible to provide an air-conditioning system for operating the heating or cooling operation in the sales floor in an energy-saving manner all year round.

[Brief description of drawings]

FIG. 1 is a schematic view showing an air conditioner using a heat pump of the present invention.

FIG. 2 is a diagram showing an operating state of a compressor in a conventional air conditioner using a heat pump day and night.

[Explanation of symbols]

 1 1st compressor 2 Exchanger 3 installed outdoors 3 Heat exchanger 4 installed in heat storage tank 4 Heat exchanger 5 installed in showcase 5 Expansion valve 8 1st control valve 9 2nd control valve 10 Third control valve 11 Heat storage tank 12 Showcase 20 Second compressor 21 Heat exchanger installed outside the room 22 Heat exchanger installed in heat storage tank 23 Heat exchanger for air conditioner 24 Expansion valve 26 Fourth Control valve 27 Fifth control valve 30 Heater A, B, C, H, I, J Connection pipe S1 Refrigeration showcase device S2 Indoor air conditioner R Sales floor

Claims (1)

[Claims] 1. A heat storage tank and a discharge pipe of a first compressor,
One end of the heat exchanger arranged inside the refrigeration showcase in the sales area, one end of the heat exchanger installed outdoors, and one end of the heat exchanger arranged inside the heat storage tank are connected, The other end of each of these heat exchangers is connected to the suction pipe of the first compressor via an expansion valve to provide a refrigeration showcase device that reversibly circulates the heat medium, and a discharge pipe of the second compressor. , One end of a heat exchanger connected to an air conditioner in the sales floor, one end of a heat exchanger installed outdoors, and one end of a heat exchanger arranged inside the heat storage tank are connected to each other. An indoor air conditioner for reversibly circulating a heat medium by connecting the other end of the heat exchanger to an intake pipe of the second compressor through an expansion valve, and an air conditioner using a heat pump. apparatus.