JPH02219963A - Cold heat accumulation refrigerating cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigeration cycle capable of storing cold and heat for an air conditioning machine (hereinafter referred to as an air conditioner).

(Prior Art) FIG. 2 is a block diagram of a reversible refrigeration cycle used in a conventional heat pump type air conditioner.

A discharge port of the compressor 10 is connected to an inflow end of a regenerative heat exchanger 66 via a discharge muffler 12 . The heat storage tank 80 is a heat insulator container filled with a heat storage material such as paraffin, and the heat storage and heat exchanger 66 is arranged together with the endothermic heat exchanger 68 so as to be able to exchange heat with the heat storage material in the heat storage Vjho. Ru. Reference numeral 14 indicates four inlets and outlets 14a and 14b.

A four-way valve with 14c and 14d is shown. This four-way valve 14
In the OFF state, the inlets 14a and 141) and the inlets 14c and 14d communicate with each other, while in the ON state, the inlets 14a and 141) communicate with each other.
, 4a and 14c, and the inlet and outlet ports 14b and 14d communicate with each other. The outflow end of the regenerative heat exchanger B6 is connected to the outflow inlet 14a of the four-way valve 14. Outflow inlet 1 of four-way valve 14
4b is connected to the indoor heat exchanger 26 via the service valve 90.
connected to one end of the An indoor fan 28 is provided near the indoor heat exchanger 26. The other end of the indoor heat exchanger 26 reaches one end of the reversible expansion valve 22 via a service valve 91 and a two-way valve 92. The other end of the reversible expansion valve 22 is connected to one end of the outdoor heat exchanger IB. This outdoor heat exchanger 1B
An outdoor fan 18 is provided near the. The other end of the outdoor heat exchanger 16 is connected to the outlet ports 14c and 14d of the four-way valve 14.
, the check valve 93 and the accumulator 32 in order to reach the suction port of the compressor 10.

A capillary 40 is connected between both ends of the reversible expansion valve 22, one end of a heating fluid bypass 48 is connected between the service valve 91 and the two-way valve 92, and the other end of this bypass is connected to the inlet of the kelp 1 notusa 10. connected to.

On the other hand, one end of a cooling fluid bypass 52 is connected between the reversible expansion valve 22 and the outdoor heat exchanger 16, and the other end of this bypass is also connected to the suction port of the compressor 10 together with one end of the pressure equalization pipe 36 of the reversible expansion valve 22. Connected. The heat-sensitive cylinder 38 of the reversible expansion valve 22 senses the temperature near the accumulator 32.

The endothermic heat exchanger 68 has one end connected between the service valve 91 and the two-way valve 92 via the two-way valve 94, and the other end connected between the check valve 93 and the accumulator 32 via the two-way valve 95. connected between. The endothermic heat exchanger 68 and the two-way valve 95 are connected between the reversible expansion valve 22 and the outdoor heat exchanger 1B via a two-way valve 96 and a check valve 97 in this order.

Next, the operation of the air conditioner equipped with the reversible refrigeration cycle described above will be explained. However, an appropriate amount of refrigerant such as fluorocarbon is sealed in the piping that constitutes this cycle.

Always keep service valves 9D and 91 open while the air conditioner is running.

In the cooling operation, the compressor 10 is driven, the four-way valve 14 is turned on, the outflow end of the storage heat exchanger 66 is directly connected to the outdoor heat exchanger 16, the two-way valve 92.95 is on, the two-way valve 94. Turn on both indoor and outdoor fans 18 and 28 with 98 off. The high-temperature, high-pressure gas refrigerant supplied to the outdoor heat exchanger 16 by the compressor 10 exchanges heat with outside air in the heat exchanger 16 and condenses. At this time, since the outdoor fan 18 is turned on, heat radiation is promoted. The pressure of the resulting liquid refrigerant is lowered by the reversible expansion valve 22, and when the low-temperature, low-pressure liquid refrigerant supplied to the indoor heat exchanger 26 vaporizes, it removes heat from the indoor air. Therefore, by operating the indoor fan 28, cool air can be sent indoors. Then, only the gas refrigerant is returned to the compressor 10 by the action of the accumulator 32.

During heating operation, the four-way valve 14 is turned off and the outlet end of the regenerative heat exchanger 66 is connected to the indoor heat exchanger 26 so as to switch the refrigerant circulation direction through the indoor and outdoor heat exchangers 18 and 28 to the opposite direction. Connect directly. Then, in the same way as during cooling operation, the compressor IO is driven, and both the indoor and outdoor fans 18.28 are turned on with the two-way valve 92.95 on and the two-way valve 94.98 off. The high-temperature, high-pressure gas refrigerant supplied to the indoor heat exchanger 26 by the compressor IO emits heat to the indoor air and condenses in the heat exchanger 2B. On this occasion,
Since the indoor fan 28 is turned on, warm air can be sent indoors. The pressure of the resulting liquid refrigerant is lowered by the reversible expansion valve 22, and when the low-temperature, low-pressure liquid refrigerant supplied to the outdoor heat exchanger 16 vaporizes, it absorbs heat from the outside air. At this time, heat absorption is promoted by operating the outdoor fan 18. Then, by the action of the accumulator 32, only the gas refrigerant is returned to the comb 1 nozzle 10.

When storing heat in the heat storage tank 60, an operation similar to the heating operation is performed with the indoor fan 28 turned off. On this occasion,
The high temperature and high pressure gas refrigerant discharged from the kelp 1 notusa 10 heats the heat storage material in the heat storage heat exchanger 66, so does it store heat? !
Heat accumulates at 60.

The heat accumulated in the heat storage tank 60 as a result of this high-temperature heat storage is utilized through the endothermic heat exchanger 68 when starting up the heating operation. During startup of heating operation for 20 to 30 minutes, the compressor IO is driven, the four-way valve 14 is turned off, the outflow end of the regenerative heat exchanger B6 is directly connected to the indoor heat exchanger 2B, and the two-way valve 94 is turned off. With .95 on and two-way valve 92.96 off, the indoor fan 28 is turned on and the outdoor fan 18 is turned off. This can supplement the heating capacity when the outside temperature is very low.

(Problems to be Solved by the Invention) The conventional reversible refrigeration cycle described above uses a discharge gas heat storage method in which the heat storage tank 60 is arranged in series with the indoor/outdoor heat exchanger 16, 26 as described above. Therefore, the following problem occurred.

That is, low-temperature heat storage, that is, cold storage, in which the heat storage material is cooled with a refrigerant, is impossible, and the heat storage tank 80 cannot be used during cooling operation. In addition, it is possible to perform an energy-saving operation in which the operation of the compressor 10, which consumes a large amount of power, is stopped and only the thermal energy stored in the heat storage tank H is used, or a high-capacity operation in which the operation of the compressor 10 and the thermal storage energy recovery operation are combined. There wasn't. Furthermore, even if the heat storage tank 80 is removed and the regenerative heat exchanger 66 and the endothermic heat exchanger B8 are replaced with vibrators in order to operate the refrigeration cycle, the cycle does not operate normally. Indoor/outdoor heat exchanger IB.

This is because the cycle design is performed on the premise that the heat storage heat exchanger 13B is connected in series with the heat storage heat exchanger 13B.

Therefore, it was not easy to remove the heat storage tank 60.

The present invention has been made in consideration of the above circumstances, and performs heating and cooling by connecting indoor and outdoor heat exchangers in series with a compressor and switching the direction of refrigerant circulation through these indoor and outdoor heat exchangers between forward and reverse. The purpose of the present invention is to solve the above problems by enabling not only high-temperature heat storage but also low-temperature heat storage in a reversible refrigeration cycle for an air conditioner.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the cold storage thermal refrigeration cycle according to the present invention connects a heat storage tank filled with a heat storage material in parallel with an indoor heat exchanger. A separate loop-shaped pipe is connected to the heat storage tank and passes through the heat storage tank to enable heat exchange with the heat storage material, and a pump and another indoor heat exchanger are installed in the middle of the loop-shaped pipe to circulate the refrigerant in this pipe. It is.

(Function) When performing low-temperature heat storage in a heat storage tank, the refrigerant is circulated from the compressor to the outdoor heat exchanger, from this heat exchanger, through the heat storage tank, and back to the compressor. At this time, the gas refrigerant supplied to the outdoor heat exchanger by the compressor exchanges heat with outside air in this heat exchanger and condenses. When the resulting liquid refrigerant passes through the heat storage tank, it evaporates and removes heat from the heat storage material.
Low-temperature heat storage is performed.

After this low-temperature heat storage has been performed, if the pump installed in the middle of the loop-shaped piping is driven, the indoor heat exchanger installed in the middle of the loop-shaped piping together with this pump, that is, the indoor loop heat exchanger, Air can be cooled. At this time, energy-saving cooling operation in which the compressor operation is stopped and only the thermal energy stored in the thermal storage tank is used, that is, thermal storage-only cooling operation, or the compressor is operated and the indoor/outdoor heat exchanger is operated while the thermal storage energy in the thermal storage tank is used. It is possible to perform a high-capacity cooling operation for recovery, that is, a cooling operation that uses heat storage kelp. Moreover, if the loop pipe pump drive is stopped, the heat storage tank can be used.1. It is also possible to perform cooling operation exclusively for kelp.

When storing high-temperature heat in a heat storage tank, the refrigerant is circulated from the compressor to the heat storage tank, from the heat storage tank, through the outdoor heat exchanger, and back to the compressor. The gas refrigerant supplied to the heat storage tank by the compressor exchanges heat with the heat storage material and condenses. At this time, the heat storage material is heated and high temperature heat is stored.

When the resulting liquid refrigerant passes through the outdoor heat exchanger, it becomes a gas refrigerant and returns to the compressor.

After this high-temperature heat storage is performed, indoor air can be heated through the indoor loop heat exchanger by driving a pump provided in the middle of the loop-shaped pipe. At this time, energy-saving heating operation in which the compressor is stopped and only the thermal energy stored in the thermal storage tank is used, that is, thermal storage-only heating operation, or the compressor is operated and the indoor/outdoor heat exchanger is operated while the thermal energy stored in the thermal storage tank is used. It is possible to perform a high-capacity heating operation for recovering heat, that is, a heating operation in combination with heat storage kelp. Moreover, if the pump drive of the loop pipe is stopped,
It is also possible to perform heating operation exclusively for kelp without using a heat storage tank.

Further, even if the heat storage tank connected in parallel to the indoor heat exchanger is removed, heating and cooling can be performed without any problem by the compressor and the indoor/outdoor heat exchanger.

(Example) FIG. 1 is a configuration diagram of a cold storage thermal refrigeration cycle according to an example of the present invention.

A discharge port of the compressor IO is connected to one outlet port 14a of a four-way valve 14 via a discharge muffler 12.

This four-way valve 14 has three other inlets 14b and 14c.
, 14d, and the inlet 1 is in the off state as before.
4a and 14b and the inlets 14c and 14d communicate with each other, while in the on state, the inlets 14a and 14c and the inlet 1
4b and 14d communicate with each other. Outflow inlet 14b of four-way valve 14
is connected to one end of the outdoor heat exchanger 16. An outdoor fan 18 is provided near the outdoor heat exchanger 16. The other end of the outdoor heat exchanger 16 is connected to one end 22a of a reversible expansion valve 22 via a sight glass 20 for observing the flow of refrigerant in the piping. The other end 22b of the reversible expansion valve 22 is connected to one end of the indoor heat exchanger 2B via a direct-acting two-way valve 24. An indoor fan 28 is provided near the indoor heat exchanger 26. The other end of the indoor heat exchanger 26 passes through the reversible two-way valve 30, the inlet/outlet 14C114d of the four-way valve 14, the accumulator 32, and the gas-liquid separation tank 34 in order to reach the inlet of the compressor IO. The reversible two-way valve 30 is
This valve allows refrigerant to pass only in the direction from the indoor heat exchanger 2G to the outflow port 14c of the four-way valve 14 in the off state, while it allows the refrigerant to pass only in the opposite direction in the on state.

The pressure equalizing pipes 38a, 38b, 36c of the reversible expansion valve 22 are connected to the suction port of the compressor lO, and the heat sensitive tubes 38a, 38
b senses the temperature near the inlet 14d of the four-way valve 14.

A capillary 40 is connected between both ends 22a and 22b of this reversible expansion valve 22. A direct-acting two-way valve 42 and another capillary 44 connected in series are connected at the midpoint between the reversible expansion valve 22 and the direct-acting two-way valve 24, and between the outflow inlet 14d of the four-way valve 14 and the accumulator 32. communicate between.

One end of the heating fluid bypass 48 is connected between the reversible expansion valve 22 and the direct-acting two-way valve 24 via the strainer 46, while the other end of this bypass is connected between the direct-acting two-way valve 42 and the capillary 4.
4. One end of the cooling fluid bypass 52 is connected to the sight glass 2o and the reversible expansion valve 22 via the dryer 50.
The other end of this bypass is connected to the middle of the pressure equalizing pipes 36b and 36c.

The heat storage tank 60 is a heat insulator container 62 filled with a heat storage material 64 . In this embodiment, water is used as the heat storage material 64 for low-temperature heat storage, and the heat storage temperature is 0°C. The heat storage material 64 includes a heat storage heat exchanger 6B and an endothermic heat exchanger 6.
8 is immersed. The storage heat exchanger G6 is connected in parallel to the indoor heat exchanger 2G.

That is, one end of the direct-acting two-way valve 70 is connected between the reversible expansion valve 22 and the direct-acting two-way valve 24, and the other end of the direct-acting two-way valve 70 is connected to the regenerative heat exchanger 66 via the needle valve 72. connected to one end of the The other end of the regenerative heat exchanger 6G is connected between the reversible two-way valve 30 and the outflow inlet 14c of the four-way valve 14 via a reversible two-way valve 74. The reversible two-way valve 74 connects the regenerative heat exchanger 66 to the outflow inlet 14 of the four-way valve 14 in the off state.
While the refrigerant can only be passed in the direction to e,
When in the on state, this valve allows refrigerant to pass only in the opposite direction.

Endothermic heat exchanger 68 constitutes a part of closed-loop thermosiphon 75 that passes through heat storage tank 60 . This thermosiphon 75 is a heat transfer path independent from the refrigerant flow path connected to the compressor lO described above, and when the heat storage temperature is 0°C as described above, R-12, R-22, etc. A fluorocarbon-based refrigerant is sealed in the thermosiphon 75. A pump 76 for circulating the refrigerant in the siphon is provided in the middle of the thermosiphon 75, and one end of the pump 7B is connected to the thermosiphon 75. - Connected to one end of the endothermic heat exchanger 68 via the glass 78.

The other end of the endothermic heat exchanger 68 is connected via another sight glass 80 to one end of an indoor loop heat exchanger 82 that is separate from the indoor heat exchanger 26 . An indoor fan 84 is provided near the indoor loop heat exchanger 82 . The other end of indoor loop heat exchanger 82 is connected to the other end of pump 76 .

The refrigerant 17 sealed in the thermosiphon 75 is suitably one that undergoes a phase change under the operating temperature and operating pressure. If you use a refrigerant that meets these conditions, the thermosiphon 7
5, and the endothermic heat exchanger 68 and the indoor loop heat exchanger 82 can be made more compact.

Next, the operation of the air conditioner equipped with the above-described cold storage heat refrigeration cycle will be explained.

For cooling, ■Kombu-only operation similar to conventional cooling operation,■
It is possible to operate in three patterns: heat storage-only operation, in which the compressor is stopped and only heat storage energy is used, and heat-storage kelp combined operation, which is a combined operation of kelp-dedicated operation and heat storage-dedicated operation.

During kelp cooling operation, the compressor 10 is driven, the four-way valve 14 is turned off, and the high-temperature, high-pressure gas refrigerant discharged from the compressor 10 is supplied to the outdoor heat exchanger 16. With the dynamic two-way valve 42.70 and the reversible two-way valve 30.74 off, the indoor and outdoor fan 18
．． Both 28 are turned on. Pump 76 and indoor fan 8
Turn off both 4 and 4. The high-temperature, high-pressure gas refrigerant supplied to the outdoor heat exchanger IB exchanges heat with outside air in this heat exchanger 16 and condenses. At this time, since the outdoor fan 18 is turned on, heat radiation is promoted. The pressure of the resulting liquid refrigerant is lowered by the reversible expansion valve 22, and when the low-temperature, low-pressure liquid refrigerant supplied to the indoor heat exchanger 2B vaporizes, it removes heat from the indoor air. Therefore, by operating the indoor fan 28, cool air can be sent indoors. Then, only the gas refrigerant is returned to the compressor 10 by the action of the accumulator 32 and the gas-liquid separation tank 34. At this time, since the direct-acting two-way valve 70 is closed, the refrigerant is not supplied to the thermal storage heat exchanger 6B.

For example, when performing low-temperature heat storage at $160 using late-night electricity, the compressor 10 is driven, the four-way valve 14 is turned off, as in the case of kelp cooling operation, and the direct-acting two-way valve 70 is turned on and the direct-acting two-way valve 70 is turned on. Dynamic two-way valve 24.42 and reversible two-way valve 30
．． 74 is turned off, the outdoor fan 18 is turned on. Both pump 78 and indoor fan 28.84 are turned off. In this case, since the direct-acting two-way valve 24 is closed and the direct-acting two-way valve 70 is open, low-temperature, low-pressure liquid refrigerant is supplied to the thermal storage heat exchanger 6B. When this liquid refrigerant vaporizes in the heat storage heat exchanger 66, it removes heat from the heat storage material 64. As a result, the heat storage material 64 solidifies and stores latent heat.

Note that if the amount of liquid refrigerant supplied to the regenerative heat exchanger 6B is too large, especially when low-temperature heat storage progresses, the regenerative heat exchanger 6
8, the liquid refrigerant may not be completely vaporized. In order to reliably prevent the liquid refrigerant from returning to the compressor 10, which may occur at this time, the needle valve 72 adjusts the flow rate of the refrigerant. A capillary tube may be used in place of the needle valve 72 as long as an appropriate value for the restriction of the needle valve 72 is determined. In addition, an electronic control valve, which is an electric throttle valve, is used in place of the needle valve 72, and the accumulator 3
A sensor may be provided to detect the temperature of the suction vibrator between the kelp 2 and the kelp 1, and the opening degree of the electronic control valve may be adjusted according to the sensor-detected temperature. When the suction pipe temperature is high, that is, when the refrigerant is sufficiently vaporized in the regenerative heat exchanger 66, the electronic control valve is opened, and when the suction pipe temperature is low, that is, when the refrigerant is sufficiently vaporized in the regenerative heat exchanger 68, the electronic control valve is opened. If this becomes impossible, throttle the electronic control valve. Thereby, even if the temperature of the cold storage material 64 reaches near the freezing point, it is possible to reliably prevent the liquid refrigerant from returning to the compressor IO. The suction vibe temperature may be detected intermittently and the throttle of the electronic control valve may be adjusted in accordance with the detection results.

At the end of the low-temperature heat storage operation described above, the compressor 10 is
When the operation of the compressor 10 is stopped, the refrigerant in the cycle gathers in the cooled storage heat exchanger 6B and condenses, causing an undercharge phenomenon when the compressor IO is next started. Therefore, it is necessary to recover the refrigerant in the heat storage heat exchanger 66. To accomplish this, when the low-temperature heat storage operation ends, the direct-acting two-way valve 70 is turned off and closed while the compressor 10 continues to operate. At this time, the direct-acting two-way valve 24 on the indoor heat exchanger 2B side is also closed, and both reversible two-way valves 30.74 allow the refrigerant to pass in the direction toward the outflow inlet 14c of the four-way valve 14.
Therefore, not only the refrigerant in the storage heat exchanger BG but also the refrigerant in the indoor heat exchanger 2G can be
recovered by O. However, if the reversible two-way valve 30 is turned on, only the refrigerant in the heat storage heat exchanger 66 can be recovered. The above refrigerant recovery operation may be forcibly terminated by measuring the operating time with a timer, or by detecting the suction side pressure of the compressor 10 with a senna, and when the detected pressure falls below a certain value. You may quit. As a result, it is possible to prevent the undercharging phenomenon that tends to occur when starting the −7 module after low-temperature heat storage.

After the above-described low-temperature heat storage is performed, heat storage-only cooling operation can be performed. During this operation, the combrella "71"
0 and all valves 14.24.30.42.
While 70.74 and indoor/outdoor fan 18.28 are off, both pump 7B and indoor fan 84 are turned on. The refrigerant circulates within the thermosiphon 75 by driving the pump 7B. At this time, the gas refrigerant exchanges heat with the low-temperature heat storage material B4 in the endothermic heat exchanger 68 to become a liquid refrigerant, and when the resulting liquid refrigerant is vaporized in the indoor loop heat exchanger 82, it removes heat from the indoor air. Therefore, since the indoor fan 84 sends cold air indoors, it is possible to perform an energy-saving cooling operation that uses only the thermal energy stored in the heat storage tank 60.

When performing the cooling operation with heat storage kelp, the compressor 10 is driven, the four-way valve 14 is turned off, the direct-acting two-way valve 24 is turned on, the direct-acting two-way valve 42 is turned on, and the direct-acting two-way valve 42 is turned on, as in the case of the kelp-only cooling operation. With 70 and reversible two-way valve 30.74 off, both indoor and outdoor fans 18.28 are turned on. However, both the pump 7B and the indoor fan 84 are turned on. Thereby, it is possible to perform a high-capacity cooling operation in which the thermal energy stored in the heat storage tank 60 is recovered while operating the compressor 10 and operating the indoor/outdoor heat exchangers 1B and 1H.

According to this embodiment, since the above-mentioned three patterns of cooling operation are possible, various operations can be performed depending on the load amount and usage conditions.

For example, when starting up the air conditioner, that is, when pulling down, the heat storage kelp is operated in combination. In addition, during peak power consumption hours or light loads between 1:00 p.m. and 4:00 p.m. in the summer, compressor 10
operation will be stopped and operation will be performed exclusively for heat storage. After the heat storage energy is used up in heat storage only operation, kelp only operation can be performed.

As the pump 7B, it is effective to use a gear pump.

This pump is resistant to air bubble entrapment and is compatible with gas-liquid two-phase refrigerant circulation.

A gas-liquid separator may be attached before the pump 76. A bubble pump may be used instead of a gear pump. In this bubble pump, a heater is wrapped around the outer wall of the vibrator on the upward flow side, the heater forcibly generates bubbles in the refrigerant, and the refrigerant is circulated by the buoyancy of the bubbles. A valve can be installed in the middle of the thermosiphon 75 to control heat transport.
You can do it as well.

Note that in order to smoothly circulate the refrigerant within the thermosiphon 75 during cooling, it is desirable to install the heat storage tank BO at a higher position than the indoor loop heat exchanger 82. Alternatively, the endothermic heat exchanger 88 that changes the phase of gas refrigerant to liquid refrigerant may be placed on the downflow side of the refrigerant, and the indoor loop heat exchanger 82 that changes the phase of liquid refrigerant to gas refrigerant may be placed on the upstream side.

During heating operation, the compressor 10 is driven and the four-way valve 1 is
4 is turned on, the direct acting two-way valve 24 and the reversible two-way valve 30
On, with the direct-acting two-way valve 42.70 and the reversible two-way valve 74 off, both the indoor and outdoor fans 18.28 are turned on. Both the pump 7B and the indoor fan 84 are turned off. At this time, the high-temperature, high-pressure gas refrigerant discharged from the compressor 10 is directly supplied to the indoor heat exchanger 26 . The gas refrigerant supplied to the indoor heat exchanger 26 emits heat to the indoor air and condenses in the heat exchanger 2B. At this time, since the indoor fan 28 is turned on, warm air can be sent indoors.

The pressure of the resulting liquid refrigerant is lowered by the reversible expansion valve 22, and when the low-temperature, low-pressure liquid refrigerant is vaporized in the outdoor heat exchanger 16, heat is taken from the outside air. At this time, heat absorption is promoted by operating the outdoor fan 18. Then, only the gas refrigerant is returned to the compressor 10 by the action of the accumulator 32 and the gas-liquid separation tank 34. At this time, since the reversible two-way valve 74 is off, the refrigerant is not supplied to the thermal storage heat exchanger 66.

A defrosting operation for forcibly defrosting the outdoor heat exchanger 1B during heating is executed as follows. That is, the heat exchanger 16 is demisted by driving the compressor 10, turning off the four-way valve 14, and supplying the high-temperature, high-pressure gas refrigerant discharged from the compressor 10 to the outdoor heat exchanger IB. This is so-called hot gas defrosting. At this time, with the direct-acting two-way valve 42 on, the direct-acting two-way valve 24.70 and the reversible two-way valve 30.74 off, the indoor and outdoor fan 18.28
Both are turned off.

Both the pump 76 and the indoor fan 84 are turned off.

The pressure of the liquid refrigerant produced in the outdoor heat exchanger 1B is lowered by the reversible expansion valve 22, and the liquid refrigerant is passed through the capillary 44 to the compressor l.
It is returned to the suction side of O.

In addition, the pressure equalizing pipes 36a, 38b, 36e of the reversible expansion valve 22
The functions of the heat-sensitive tubes 38a, 38b, the capillary 40, the strainer 46, the heating fluid bypass 48, the dryer 50, and the cooling fluid bypass 52 are all well known, so their explanations will be omitted. Sight glasses 20, 78, and 80 may be provided as necessary.

Now, if a material suitable for high-temperature heat storage is used as the heat storage material B4, highly efficient heating operation using heat storage becomes possible.

Since the amount of heat storage can be greatly increased by utilizing latent heat storage, it is desirable to use, for example, paraffin type or hydrated salts as the heat storage material B4.

High-temperature heat storage is performed by circulating a refrigerant in the opposite direction to low-temperature heat storage. When using the heat accumulated in the heat storage material B4, the refrigerant in the thermosiphon 75 is circulated by the pump 7B to transport the heat in the heat storage tank 60 to the indoor loop heat exchanger 82, and the indoor fan 84 is turned on. In other words, regarding heating operation, not only operation exclusively for kelp, but also operation exclusively for heat storage or operation in combination with heat storage kelp is possible.

When using the heat storage tank 60 that stores high-temperature heat, the liquid refrigerant undergoes a phase change to gas refrigerant in the endothermic heat exchanger B8, and the gas refrigerant undergoes a phase change to liquid refrigerant in the indoor loop heat exchanger 82. Therefore, when utilizing heat storage for both cooling and heating, instead of installing the heat storage tank 60 at a higher position than the indoor loop heat exchanger 82 as described above, the endothermic heat exchanger 68 is placed on the upward flow side of the refrigerant. In addition, an indoor loop heat exchanger 82 is placed on the downstream side. That is, by arranging the endothermic heat exchanger 68 and the indoor loop heat exchanger 82 at the two rising portions of the thermosiphon, the refrigerant circulation within the thermosiphon 75 can be smoothly performed for both heating and cooling. However, the thermosa r-phone 75 during heating operation
Since the direction of refrigerant circulation inside the room is opposite to that during cooling operation, two bubble pumps are used, and these are used separately for heating and cooling. If you are using a gear pump, you can remove it and install it in the opposite direction.

In the cold storage heat refrigeration cycle described above, the heat storage tank GO is provided in parallel to the indoor heat exchanger 26, so if a flare joint or the like is installed at an appropriate location, the heat storage tank 60 can be removed. Also, the compressor 10 and the indoor/outdoor heat exchanger IL2B can perform heating and cooling without any problems.

[Effects of the Invention] As explained above, the cold storage thermal refrigeration cycle according to the present invention connects a heat storage tank filled with a heat storage material in parallel to an indoor heat exchanger so that heat can be exchanged with the heat storage material. A loop-shaped pipe that passes through the heat storage tank is separately provided, and a pump that circulates the refrigerant in this pipe and another indoor heat exchanger are installed in the middle of this loop-shaped pipe, so that cold heat storage and high-temperature heat storage can be combined. Both are possible. Therefore, unlike conventional methods, high-temperature heat storage is utilized.1. In addition to heating operation, cooling operation using low-temperature heat storage is possible. In addition, it is possible to perform energy-saving operation by stopping the operation of the compressor and using only the thermal energy stored in the heat storage tank, and it is possible to cut peak power consumption. It is also possible to perform high-capacity operation that recovers the thermal energy stored in the heat storage tank while operating the compressor, making it possible to improve the start-up speed of heating and cooling operations and cope with overloads.

It is also possible to operate the compressor only after the stored thermal energy is completely used up. Furthermore, since the heat storage tank is installed in parallel to the indoor heat exchanger, even if the heat storage tank is removed if necessary, heating and cooling can be carried out without any problem using the compressor and l-indoor/outdoor heat exchanger. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a cold storage thermal refrigeration cycle according to an embodiment of the present invention, and Fig. 2 is a block diagram of a conventional reversible refrigeration cycle. Valve, 1B...
・Outdoor heat exchanger, I8...Outdoor fan, 22...Reversible expansion valve, 24.Direct-acting two-way valve, 2B...Indoor heat exchanger, 2B...Indoor fan, 30...Reversible Two-way valve, 32
... Akicom 1/-Yu, 42 ... Direct-acting two-way valve, 60
... Heat storage tank, 64... Heat storage material, 6B... Thermal storage heat exchanger, 68... Endothermic heat exchanger, 70... Direct-acting two-way valve, 72... Needle valve, 74... ...Reversible two-way valve, 75
・・Closed loop thermosiphon, 76 ・Pump, 82 ・Indoor loop heat exchanger, 84 ・Indoor fan O

Claims (1)

[Claims] 1. A reversible refrigeration cycle for air conditioning machines that connects indoor and outdoor heat exchangers in series with a compressor and performs air conditioning and heating by switching the direction of refrigerant circulation through these indoor and outdoor heat exchangers, in which the heat storage material is The filled heat storage tank is connected in parallel to the indoor heat exchanger, a separate loop-shaped pipe is provided that passes through the heat storage tank to enable heat exchange with this heat storage material, and the refrigerant in this pipe is circulated in the middle of this loop-shaped pipe. A cold storage heat refrigeration cycle characterized in that it is equipped with a pump and another indoor heat exchanger.