JP2500979B2 - Thermal storage refrigeration cycle device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative refrigeration cycle apparatus having a heat storage tank.

[0002]

2. Description of the Related Art A conventional embodiment will be described below. That is, FIG. 12 is a cycle explanatory view showing a conventional heat storage type refrigerating apparatus disclosed in, for example, Japanese Patent Laid-Open No. 63-116055, in which 1 is a compressor, 2 is a heat source side heat exchanger, 3 is a first expansion device, 4 is a use side heat exchanger such as an indoor unit of an air conditioner, 6 is a heat storage tank, and a heat storage medium 7 and a heat exchanger 9 are housed inside. The heat exchanger 9 has a heat storage heat exchanger 92 and a heat storage utilization heat exchanger 91. 10 is the first
In the heat storage bypass passage, 10a and 10b are the first heat storage bypass passage opening / closing device, 11 is the second expansion device, and 13
Is a bypass path for heat storage use, 13a and 13b are switchgear for bypass path for heat storage use, 15 is a refrigerant circulation pump, 1
Reference numeral 6 is a low pressure side gas-liquid separator, 17 is a high pressure side liquid reservoir, 18 is a second heat storage bypass passage, and 18a and 18b are opening / closing devices for the second heat storage bypass passage.

Next, the operation will be described. The heat storage operation, that is, in order to store low-temperature heat in the heat storage tank 6 by freezing the water as the heat storage medium 7, the switchgear 10b, 1
3a and 18a are closed, and switchgear 10a, 13b and 18b
When the compressor 1 and the refrigerant circulation pump 15 are operated, the high-temperature high-pressure gas refrigerant from the compressor 1 dissipates heat in the heat source side heat exchanger 2, and itself condenses and liquefies to use the liquid pool 17 and heat storage utilization. After passing through the bypass line 13, the second expansion device 11 adiabatically expands to form a low-temperature liquid-gas two-phase fluid and enters the low-pressure side gas-liquid separation device 16. Here, only the low temperature liquid is the refrigerant circulation pump 1.
At 5 the heat storage heat exchanger 92 is passed through the second heat storage bypass passage 18, the heat is taken from the heat storage medium 7, and the heat is evaporated into gas to return to the low pressure side gas-liquid separation device 16 and together with the aforementioned gas. Return to compressor 1.

[0004] There are three types of cooling operation in the manner of radiating the heat absorbed by the indoor use side heat exchanger 4. The first is a method in which all the heat is discarded in the heat storage medium, and all of the condensation load is covered by the cold storage heat. This operation is performed by the switchgear 10b, 18
When b is closed, the opening / closing devices 10a and 18a are opened, the compressor 1 is stopped, and only the refrigerant circulation pump 15 is operated, the low-temperature liquid refrigerant is transferred to the use-side heat exchanger 4 by the first expansion device 3. Be sent through. Here, heat is taken from the surroundings to cool,
It is vaporized and gasified, and is sent to the heat storage heat exchanger 92. Here, the gas is cooled by the low-temperature heat storage medium 7, condenses itself into a low-temperature liquid, and returns to the low-pressure side gas-liquid separation device 16.

The second is a method of releasing heat to both the atmosphere and the heat storage medium. Since the liquid refrigerant condensed in the heat source side heat exchanger 2 is further cooled by the cold storage heat, the liquid subcooling cooling operation will be described below. I will call it. This operation is performed by the switchgear 10a, 13
When b and 18b are closed, switchgear 10b, 13a and 18a is opened, and compressor 1 and refrigerant circulation pump 15 are operated, the high temperature high pressure gas refrigerant from compressor 1 radiates heat in heat source side heat exchanger 2 and itself. Is condensed and liquefied, and enters the heat storage utilization heat exchanger 91 through the liquid reservoir 17. Here, the liquid refrigerant is further cooled by the low-temperature heat storage medium 7, and becomes itself a supercooled liquid,
The expansion device 11 adiabatically expands to form a low-temperature liquid-gas two-phase fluid and enters the low-pressure side machine liquid separation device 16. Here, only the low temperature liquid is sent to the utilization side heat exchanger 4 via the first expansion device 3 by the refrigerant circulation pump 15. Here, heat is taken from the surroundings to cool it, and it is evaporated and gasified, and returns to the low pressure side gas-liquid separation device 16 via the first heat storage bypass path 10,
Return to compressor with above mentioned gas.

[0006] The third is a method of releasing heat only to the atmosphere, which is referred to as a general cooling / refrigeration cycle operation since the operation is unrelated to heat storage. This operation is performed by the switchgear 10a, 13
When a, 18b are closed, switchgear 10b, 13b, 18b is opened and the compressor 1 and the refrigerant circulation pump 15 are operated, the compressor 1, the heat source side heat exchanger 2, the liquid reservoir 17, the heat storage bypass path 13 are used. , The second expansion device 11, and the low-pressure side gas-liquid separation device 16 operate in the same manner as in the heat storage operation, and the refrigerant circulation pump 15, the first expansion device 3, the use-side heat exchanger 4, and the first The heat storage bypass passage 10 and the low-pressure side gas-liquid separation device 16 operate in the same manner as during the liquid subcooling cooling operation.

In the cooling capacity of this system, the capacity in the liquid supercooling cooling operation is larger than the capacity in the general cooling refrigeration cycle operation by the amount of the supercooled heat. Therefore, the capacity of the equipment is determined by the performance during the liquid subcooling cooling operation, and the general operation of the system is to perform heat storage operation at night, and when the load is small, cool by the cool storage condensation cooling operation, and the load When it is large, cooling is performed by liquid subcooling operation, and when heat storage is lost, cooling is performed by general cooling and refrigeration cycle operation.

[0008]

Since the conventional heat storage type refrigeration cycle device is constructed as described above, the refrigerant circulation pump 15 must be operated in all operation modes, and the maximum refrigeration cycle is required. There is a problem in that it is necessary to secure a refrigerant circulation amount sufficient to cover the capacity, which is not only against the energy saving but also when the refrigerant circulation pump 15 has a trouble, the cooling must be stopped.

The present invention has been made in order to solve the above problems, and obtains a heat storage type refrigeration cycle apparatus which is inexpensive, energy saving, and in which troubles such as a need to stop the cooling operation are unlikely to occur. The purpose is to

[0010]

A heat storage refrigeration cycle device according to the present invention is a refrigeration device formed by sequentially connecting a compressor, a heat source side heat exchanger, a first expansion device, and a use side heat exchanger. Cycle, a heat source side heat exchanger bypass path connecting the inlet side and the outlet side of the heat source side heat exchanger, and a suction side of the compressor having a heat storage heat exchanger and the heat source side heat exchanger A heat storage bypass path connecting the outlet side, a second expansion device provided between the outlet side of the heat source side heat exchanger and the inlet side of the heat storage heat exchanger, and the second expansion device. A second expansion device bypass passage that connects the inlet side and the outlet side of the device, and a heat storage tank that stores therein a heat storage medium that exchanges heat with the refrigerant supplied to the heat storage heat exchanger,
A heat storage utilization bypass path that connects the refrigerant outlet side of the heat storage heat exchanger and the inlet side of the first expansion device, and a second temperature detection device that detects the temperature of the heat storage medium , and during heat storage operation From the compressor to the heat source side heat exchanger, the second
Storage circuit leading to the compressor via the expansion device and the heat storage heat exchanger, and during the cold storage condensation operation, the bypass path for the heat source side heat exchanger from the compressor, and the bypass path for the second expansion device. , A heat storage heat exchanger, the heat storage bypass path, the first expansion device, and a cold storage condensing circuit leading to the compressor via the use side heat exchanger, the liquid compression operation during liquid supercooling operation. Machine to the heat source side heat exchanger, the second
A bypass passage for the expansion device, the heat exchanger for heat storage, the bypass passage for heat storage, the first expansion device, and a liquid subcooling circuit leading to the compressor via the heat exchanger on the use side,
During the general cooling operation, the cooling circuit forming the refrigeration cycle is configured, and operation mode setting means for selecting the liquid subcooling operation, the cold storage condensation operation, and the general cooling operation based on the temperature detected by the second temperature detection device. Is provided.

The temperature detected by the second temperature detecting device
However, if the temperature is lower than the control heat storage medium temperature, cold storage condensing operation
Or, select the liquid subcooling operation and set it higher than the control heat storage medium temperature.
Operation mode switching means to select general cooling operation if no
Is provided.

The first temperature for detecting the temperature of the heat source medium
A detection device is provided, and when the temperature detected by the first temperature detection device is lower than the control heat source medium temperature and the temperature detected by the second temperature detection device is lower than the second control heat storage medium temperature, cold storage condensation When the operation is selected, the temperature detected by the first temperature detection device is set higher than the control heat source medium temperature, and the temperature detected by the second temperature detection device is set higher than the second control heat storage medium temperature. When the temperature is lower than the control heat storage medium temperature, operation mode switching means for selecting the liquid supercooling operation is provided.

The first temperature for detecting the temperature of the heat source medium
A detection device is provided, and an operation mode switch for selecting the liquid subcooling operation when the temperature difference between the temperature detected by the first temperature detection device and the temperature detected by the second temperature detection device is equal to or greater than the control reference temperature difference. Means are provided.

Further, the second control heat storage medium temperature for selecting the cold storage condensing operation is set lower than the first control heat storage medium temperature for selecting the liquid supercooling operation, and the second control heat storage medium temperature is set during the cold storage condensing operation.
Provided with operation mode switching means for switching to the liquid subcooling operation when the temperature detected by the temperature detecting device rises to a temperature range not lower than the second control heat storage medium temperature and not higher than the first control heat storage medium temperature. Is.

The first temperature for detecting the temperature of the heat source medium
A detection device is provided, and the temperature detected by the second temperature detection device during the cold storage condensation operation rises above the second heat storage medium temperature for control, and the reference temperature for control with respect to the temperature detected by the first temperature detection device. When the difference is more than the difference, operation mode switching means for switching to the liquid subcooling operation is provided.

[0016]

The refrigerant circulation of the refrigeration cycle according to the present invention is as follows.
In all of the heat storage operation, the cold storage condensation operation, the liquid supercooling operation, and the general cooling operation, the refrigerant circulation pump is not used and only the compressor is used. Further, during the cold storage condensation operation, even though the compressor operates, a high compression ratio of low C, O,
P (Coefficient of perfomanc)
e: The coefficient of performance is operated. Further, the operation mode setting means for selecting the liquid supercooling operation, the cold storage condensation operation and the general cooling operation is automatically operated based on the heat source medium temperature and the heat storage medium temperature detected by the first and second temperature detection devices. Since the modes are switched, the operation for effectively utilizing the heat storage medium is performed.

[0017]

An embodiment of the present invention will be described below. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG . 1 is an explanatory view showing a cycle of the heat storage type refrigerating apparatus of the present invention. In the figure, 1 is a compressor,
Reference numeral 2 is a heat source side heat exchanger, 3 is a first expansion device, 4 is a use side heat exchanger such as an indoor unit of an air conditioner, 5 is an accumulator, which is sequentially connected to 1 to 4 to form a refrigeration cycle. . 6 is a heat storage tank for accommodating the heat storage medium 7 therein, 8
Is a heat storage medium circulation pump that circulates the heat storage medium between the heat storage tank 6 and the heat storage heat exchanger 9, and 10 is a heat storage bypass passage, which has the heat storage heat exchanger 9 and is on the suction side of the compressor 1. And the outlet side of the heat source side heat exchanger 2 are connected. 10a, 1
0b, 10c are switchgear for heat storage bypass, 11
Is a second expansion device provided between the outlet side of the heat source side heat exchanger 2 and the inlet side of the heat storage heat exchanger 9, and 12 is the second
Second throttle passage for connecting the inlet side and the outlet side of the throttle device 11, 12a is an opening / closing device for the second throttle device bypass passage, and 13 is one end of the heat storage heat exchanger 9 A bypass path for heat storage use, 13a is a bypass path for heat storage use, which is connected between the refrigerant outlet side and the switchgear apparatus 10b, and the other end is connected between the switch apparatus 10c and the inlet side of the first expansion device 3. Switch device for heat source side heat exchanger 2, 14 for connecting the inlet side and outlet side of heat source side heat exchanger 2, heat source side heat exchanger bypass passages, and 14a, 14b for heat source side heat exchanger bypass route .

Further, 21 is a first temperature detecting device for detecting the temperature of the heat source medium flowing into the heat source side heat exchanger 2, and 22 is a second temperature detecting device for detecting the temperature of the heat storage medium 7 flowing into the heat storage heat exchanger. The temperature detecting device 23 is an operation mode setting means for automatically selecting various cooling operation modes described later based on the temperatures detected by the first and second temperature detecting devices 21 and 22.

Next, the operation will be described. FIG. 2 is a circuit diagram showing an operation during heat storage operation, which is mainly nighttime operation, in which the switchgear 10c, 12a, 13a, 14a is closed, the switchgear 10a, 10b, 14b is opened, and the compressor 1
When the heat storage medium circulation pump 8 is operated, the compressor 1
The high-temperature and high-pressure gas refrigerant radiates heat in the heat source side heat exchanger 2,
The liquid itself condenses and liquefies, adiabatically expands in the second expansion device 11 to become a low temperature liquid gas two-phase fluid, and enters the heat storage heat exchanger 9,
Heat is taken from the heat storage medium 7 sent by the heat storage medium circulation pump 8 to be vaporized by itself, and the accumulator 5
After that, it returns to the compressor 1.

By this operation, low-temperature heat is stored by freezing the water in the heat storage medium 7. In this embodiment, the heat storage medium circulating pump is used because the heat exchanger for heat storage of the forced convection type is employed, but the efficiency is higher than that of the generally used natural convection type, and the pump power is increased. This method is adopted because the compressor power can be expected to decrease more than the addition.

3, 5, and 7 are operation diagrams of the cooling operation, and FIG. 3 shows a circuit diagram during the cold storage condensation cooling operation. In this case, close the switchgear 10b, 10c, 12a, 14b,
When the switchgear 10a, 13a, 14a is opened and the compressor 1 and the heat storage medium circulation pump 8 are operated, the high-temperature high-pressure gas refrigerant from the compressor 1 causes the heat source side heat exchanger bypass passage 14,
It enters the heat storage heat exchanger 9 through the second expansion device bypass path 12, is cooled by the heat storage medium 7 sent by the heat storage medium circulation pump 8, condenses itself into liquid, and is thermally insulated by the first expansion device 3. It expands and becomes a low-temperature liquid gas two-phase fluid, enters the heat exchanger 4 on the use side, where it takes heat from the surroundings to cool it, evaporates and gasifies itself, and returns to the compressor 1 via an accumulator 5.

When the operation at this time is shown on the Mollier diagram,
As shown in FIG. 4 , the operation is performed at a low compression ratio in which the condensing pressure is suppressed to a low level, the compressor input enthalpy (Δid) is extremely small, and the condensation enthalpy (Δie) for cooling is almost the same amount. It is only necessary to consume (Δic) from the heat storage medium. The English symbols in the figure indicate the state on the diagram at the position shown in FIG.

FIG . 5 shows a circuit diagram during the liquid subcooling operation. In this case, the switchgear 10b, 10c, 14a is closed, the switchgear 10a, 12a, 13a, 14b is opened, and the compressor 1
When the heat storage medium circulation pump 8 is operated, the high-temperature high-pressure gas refrigerant from the compressor 1 dissipates heat in the heat source side heat exchanger 2 and condenses itself into a liquid, which is used for heat storage via the second expansion device bypass passage 12. Enter the heat exchanger 9. Here, the heat storage medium circulation pump 8
The liquid refrigerant is further cooled by the heat storage medium 7 sent by the above, becomes a supercooled liquid, and is sent to the first expansion device 3, where it is adiabatically expanded and becomes a low temperature liquid gas two-phase fluid and is used side. The heat enters the heat exchanger 4, where heat is taken from the surroundings to be cooled, and the heat is evaporated and gasified, and then returns to the compressor 1 via the accumulator 5. When the operation at this time is shown on the Mollier diagram, as shown in Fig. 6, the operation is expanded laterally by the supercooling enthalpy, and the compressor input enthalpy (△
id) is the value of the value, and the enthalpy of evaporation for cooling is (△
It increases from i1) to (Δi2).

FIG . 7 shows a circuit diagram during the refrigeration cycle operation of general cooling. In this case, the switchgear 10a, 13a, 14
When a is closed, the switchgear 10b, 10c, 12a, 14b is opened and the compressor 1 is operated, the high temperature and high pressure gas refrigerant from the compressor 1 dissipates heat in the heat source side exchanger 2, and itself condenses and liquefies. Is sent to the first expansion device 3 via the expansion device bypass passage 12, where it is adiabatically expanded into a low-temperature liquid-gas two-phase fluid and enters the use-side heat exchanger 4, where heat is taken from the surroundings. Then, it cools itself, evaporates and gasifies, and returns to the compressor 1 through the accumulator 5.

The cooling capacity of this system, as in the conventional embodiment, is larger in the liquid supercooling cooling operation than in the normal cooling refrigeration cycle operation by the amount of supercooled heat. Therefore, the capacity of the equipment is determined by the performance during the liquid subcooling cooling operation, and the general operation of the system is to perform heat storage operation at night, and when the load is small, cool by the cool storage condensation cooling operation, and the load When it is large, cooling is performed by the liquid subcooling cooling operation, and when heat storage is lost, or when it is necessary to save the heat storage amount before entering the heat storage utilization operation time period, cooling is performed by the refrigeration cycle operation of general cooling.

Next, with reference to the flow chart shown in FIGS. 8 to 11, how to select the aforementioned various cooling operation mode by the operation mode setting means 23. 8, when starting the cooling operation in step 40, compared with the heat medium temperature T _a sensed by the first temperature detector 21 at step 41 and the control heat medium temperature T _a0, T _a
Is smaller than T _a0 , it is determined that the cooling load is relatively small, and the routine proceeds to step 42. In step 42, the heat storage medium temperature T detected by the second temperature detection device 22.
_w is compared with the second control heat storage medium temperature T _w2 for determining whether or not the heat storage medium temperature is effective for the cold storage condensation operation, and T
_{When w} is lower than T _w2 , the routine proceeds to step 43, where the cold storage condensation operation is selected. In step 41, the heat source medium temperature T _a
Is higher than T _a0 , it is determined that the cooling load is large, and the routine proceeds to step 44. In step 44, the heat storage medium temperature T
_w is compared with a first control heat storage medium temperature T _w1 for determining whether or not the heat storage medium temperature is effective for liquid subcooling operation, and T
_{When w} is lower than T _{w1, the routine} proceeds to step 46, where the liquid supercooling operation is selected. Also, step 42 and step 4
In 4, when the heat storage medium temperature T _w is higher than the first and second control heat storage medium temperatures T _w1 and T _w2 , the _routine proceeds to step 47, where the general cooling operation is selected. In addition, the setting of the control heat source medium temperature T _a0 is as follows.
In order to distinguish between midsummer and mid-season, the temperature will be around 28 to 30 ° C.

In FIG . 9 , step 4 is compared with FIG.
In the case of 1, the heat source medium temperature Ta is higher than T _a0 . In step 45, the temperature difference between the heat source medium temperature T _a and the heat storage medium temperature T _w is greater decides whether or not the compared to the control reference temperature T _b, fluid flow proceeds to step 46 when the temperature difference is large Select supercooling operation. That is, when the heat storage medium temperature T _w increases, the temperature difference from the refrigerant temperature condensed by the heat source medium temperature T _a decreases, the heat exchange amount in the heat storage heat exchanger 9 decreases, and the obtained supercooling amount. However, since it does not become so large, it becomes difficult to obtain the effect of heat storage.

In FIG . 10 , when the first control heat storage medium temperature T _w1 is set higher than the second control heat storage medium temperature T _w2 and the heat storage medium temperature T _w rises during the cold storage condensation operation. Then, the process proceeds from step 42 to step 44. In step 44, when the heat storage medium temperature T _W is lower than the first control heat storage medium temperature T _w1 , the process proceeds to step 46 to perform the liquid supercooling operation. In the case of the cold storage condensing operation, the latent heat of condensation of all the refrigerants needs to be processed by the heat storage heat exchanger 9, and the heat exchange amount also becomes large. Therefore, the heat storage medium temperature that can be effectively used is limited. . That is, the region where the condensation temperature when condensed by the heat storage medium is lower than the condensation temperature when condensed by the heat source medium is an effective region from the viewpoint of heat storage utilization. (The capacity of the heat storage heat exchanger 9 can be increased as a method of expanding the effective region of the heat storage medium temperature, but it becomes large and uneconomical.) On the other hand, the heat required in the liquid subcooling operation The exchange amount is a small value because it only cools the refrigerant liquid condensed to the liquid region in the heat source side heat exchanger 2. Therefore, it is possible to effectively use the heat storage medium having a higher temperature than in the cold storage condensation operation.

In FIG . 11 , when the heat storage medium temperature T _w rises during the cold storage condensing operation, the routine proceeds from step 42 to step 45. In step 45, the heat source medium temperature T
_When the temperature difference between _a and the heat storage medium temperature T _W is larger than the control reference temperature difference T _{b, the} routine proceeds to step 46, where the liquid subcooling operation is selected. In other words, after a certain amount of heat storage is used in the cold storage condensing operation, the heat storage is further utilized in the liquid supercooling operation.

In the above embodiment, the temperature of the heat source medium is detected.
And a second temperature detecting device for detecting the temperature of the heat storage medium.
Although an example in which a temperature detection device is provided is shown, general cooling operation,
Automatic switching only between cold storage condensation operation or liquid subcooling operation
The first temperature detection device must be
It may not be provided. Also, although it has been described that it is used for air conditioning, it can be used for other purposes such as freezing and refrigeration.

[0032]

As described above, according to the present invention, the refrigeration cycle formed by sequentially connecting the compressor, the heat source side heat exchanger, the first expansion device, and the utilization side heat exchanger, The heat source side heat exchanger has a bypass path for connecting the inlet side and the outlet side of the heat source side heat exchanger, and a heat storage heat exchanger, and connects the suction side of the compressor and the outlet side of the heat source side heat exchanger. A bypass path for heat storage, a second expansion device provided between the outlet side of the heat source side heat exchanger and the inlet side of the heat storage heat exchanger, and an inlet side of the second expansion device. A second expansion device bypass line connecting the outlet side, a refrigerant supplied to the heat storage heat exchanger, a heat storage tank for storing a heat storage medium for heat exchange therein, and the heat storage heat exchanger. And a bypass path for heat storage utilization that connects the refrigerant outlet side and the inlet side of the first expansion device. At the time of heat storage operation, a heat storage circuit from the compressor to the compressor via the heat source side heat exchanger, the second expansion device, and the heat storage heat exchanger, and at the time of cold storage condensation operation, From the compressor to the heat source side heat exchanger bypass passage, the second expansion device bypass passage, the heat storage heat exchanger, the heat storage utilization bypass passage, the first expansion device, and the utilization side heat exchange. Storage condenser circuit leading to the compressor through a compressor, and during liquid supercooling operation, the compressor to the heat source side heat exchanger, the second expansion device bypass passage, the heat storage heat exchanger, A bypass circuit for heat storage use, the first expansion device, and a liquid subcooling circuit that reaches the compressor via the use-side heat exchanger, and a cooling circuit that forms the refrigeration cycle during general cooling operation. Since it is configured, it is Is not necessary to separately provide a coolant circulation pump, device can be inexpensive, high energy saving, and hardly generated system problems such as not necessary to stop the cooling has an effect to be obtained.

Further, a second temperature sensing equipment for detecting the thermal storage medium temperature, based on the thermal storage medium temperature, generally cooling operation and the liquid subcooling operation and the operation mode switching means for selecting and cool storage condensing operation Since various cooling operation modes are automatically switched, the heat storage amount stored in the heat storage medium can be effectively used.

The temperature detected by the second temperature detecting device
However, if the temperature is lower than the control heat storage medium temperature, cold storage condensing operation
Or, select the liquid subcooling operation and set it higher than the control heat storage medium temperature.
If it is not, the general cooling operation is selected.
Has no first temperature detector to detect the temperature of the heat source medium
Also uses the heat storage amount in an effective operation mode according to the air conditioning load
In addition to being able to do, sufficient air conditioning capacity can be exhibited.

The first temperature for detecting the temperature of the heat source medium
A detection device is provided, and when the heat source medium temperature is higher than the control heat source medium temperature and the heat storage medium temperature is lower than the first control heat storage medium temperature, liquid subcooling operation is selected, and the heat source medium temperature is set to the control heat medium. Lower than the temperature and the heat storage medium temperature is the first
When the temperature is lower than the second control heat storage medium temperature that is set lower than the control heat storage medium temperature, the cold storage condensation operation is selected, so that the heat storage amount can be used in an effective operation mode according to the air conditioning load. At the same time, sufficient air conditioning capacity can be exhibited.

Further, since the liquid subcooling operation is selected when the temperature difference between the heat source medium temperature and the heat storage medium temperature is equal to or larger than the control reference temperature difference, the heat storage amount can be reliably stored in a state where the supercooling amount can be obtained. It can be used and energy saving effect can be obtained.

Further, the second control heat storage medium temperature for selecting the cold storage condensing operation is set lower than the first control heat storage medium temperature for selecting the liquid supercooling operation, and the heat storage medium temperature is set to the first temperature during the cold storage condensing operation. When the temperature rises above the control heat storage medium temperature of 2 and below the first control heat storage medium temperature, the liquid supercooling operation is switched to. Therefore, even when the air conditioning load is relatively small, The cooling operation makes it possible to improve the utilization efficiency of the heat storage amount.

Further, when the heat storage medium temperature rises above the second control heat storage medium temperature during the cold storage condensation operation and the temperature difference from the heat source medium temperature is above the control reference temperature difference, Since the mode is switched to the liquid supercooling operation, the heat storage amount can be effectively used by combining the cold storage condensing operation and the liquid supercooling operation.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a heat storage type refrigeration cycle apparatus according to an embodiment of the present invention.

FIG. 2 is an operation diagram during heat storage operation according to an embodiment of the present invention.

[Fig. 3] Fig. 3 is an operation diagram during a cool storage condensation cooling operation according to an embodiment of the present invention.

FIG. 4 is a Mollier diagram of the operation during the cold-storage condensation cooling operation according to the embodiment of the present invention.

FIG. 5 is an operation diagram during liquid subcooling cooling operation according to an embodiment of the present invention.

FIG. 6 is a Mollier diagram of an operation during liquid subcooling cooling operation according to the embodiment of the present invention.

FIG. 7 is an operation diagram during a refrigeration cycle operation of general cooling according to an embodiment of the present invention.

FIG. 8 is a flowchart showing a control state for selecting various cooling operation modes according to an embodiment of the present invention.

FIG. 9 is a flowchart showing a control state for selecting various cooling operation modes according to the embodiment of the present invention.

FIG. 10 is a flowchart showing a control state for selecting various cooling operation modes according to an embodiment of the present invention.

FIG. 11 is a flowchart showing a control state for selecting various cooling operation modes according to an embodiment of the present invention.

FIG. 12 is a cycle diagram of a conventional heat storage type refrigeration cycle apparatus.

[Explanation of symbols]

 1 Compressor 2 Heat source side heat exchanger 3 First expansion device 4 Utilization side heat exchanger 6 Heat storage tank 7 Heat storage medium 9 Heat storage heat exchanger 10 Heat storage bypass passage 11 Second expansion device 12 Second expansion device Bypass path 13 for heat storage use bypass path 14 for heat source side heat exchanger bypass path 21 first temperature detection device 22 second temperature detection device 23 operation mode setting means

Claims (6)

(57) [Claims] 1. A refrigeration cycle formed by sequentially connecting a compressor, a heat source side heat exchanger, a first expansion device, and a use side heat exchanger, and an inlet side and an outlet side of the heat source side heat exchanger. A heat source side heat exchanger bypass path connecting with, and a heat storage bypass path connecting the suction side of the compressor and the outlet side of the heat source side heat exchanger having a heat storage heat exchanger, and the heat source side. A second throttle device provided between the outlet side of the heat exchanger and the inlet side of the heat storage heat exchanger, and a second throttle device that connects the inlet side and the outlet side of the second throttle device. A device bypass path, a heat storage tank that accommodates therein a heat storage medium for exchanging heat with the refrigerant supplied to the heat storage heat exchanger, a refrigerant outlet side of the heat storage heat exchanger, and the first heat storage tank. A bypass path for using heat storage that connects the inlet side of the expansion device, and a second temperature that detects the temperature of the heat storage medium. And a heat storage circuit that reaches the compressor from the compressor via the heat source side heat exchanger, the second expansion device, and the heat storage heat exchanger during heat storage operation, cold storage condensation During operation, from the compressor to the heat source side heat exchanger bypass passage, the second expansion device bypass passage, the heat storage heat exchanger, the heat storage utilization bypass passage, the first expansion device, and the A cold storage condensing circuit leading to the compressor via the use side heat exchanger, during liquid supercooling operation, the compressor to the heat source side heat exchanger, the second expansion device bypass passage, the heat storage heat exchange Tank, the bypass path for heat storage use, the first expansion device, a liquid subcooling circuit that reaches the compressor through the use side heat exchanger, and cooling that forms the refrigeration cycle during general cooling operation constitute a circuit, by the second temperature sensing device Out on the basis of the temperature, the liquid subcooling operation and cold storage condensing operation and general cooling operation, characterized in that a driving mode setting means for selecting the regenerative refrigeration cycle apparatus 2. The temperature detected by the second temperature detecting device is:
If the temperature is lower than the control heat storage medium temperature, cool storage condensation operation or
Select the liquid subcooling operation, and if the temperature is higher than the control heat storage medium temperature
The heat storage refrigeration cycle apparatus according to claim 1, further comprising: an operation mode switching unit that selects a general cooling operation. 3. A first temperature detection for detecting the temperature of a heat source medium.
A device is provided so that the temperature detected by the first temperature detection device
Second temperature detection device lower than control heat source medium temperature
When the temperature detected by is lower than the temperature of the second control heat storage medium,
The case selects the contraction operation coagulation cold storage, the first temperature sensing device
The detected temperature is higher than the temperature of the heat source medium for control, and
The temperature detected by the temperature detector is the second control heat storage medium temperature.
Lower than the first control heat storage medium temperature set higher than
Heat storage refrigeration cycle apparatus according to claims Paragraph 1, characterized in that a driving mode switching means for selecting a liquid supercooling operation when household. 4. A first temperature detection for detecting a temperature of a heat source medium.
A device is provided, and the temperature detected by the first temperature detection device is
And the temperature difference between the temperature detected by the second temperature detector and
Regenerative refrigeration cycle apparatus according to claims Paragraph 1, characterized in that a driving mode switching means that select the liquid subcooling operation in the case of more than patronage reference temperature difference. 5. A second control storage for selecting a cold storage condensation operation.
First heat storage for heat medium temperature, which selects liquid supercooling operation
The temperature is set lower than the heat medium temperature, and the second temperature is set for cool storage condensation operation.
The temperature detected by the detection device is equal to or higher than the second control heat storage medium temperature.
The operation mode switching means for switching to the liquid subcooling operation when the temperature rises to a temperature range equal to or lower than the first control heat storage medium temperature is set forth in claim 1. Heat storage type refrigeration cycle device. 6. A first temperature detection for detecting a temperature of a heat source medium.
A device is provided, and the second temperature detection device is used during the cold storage condensation operation.
Detected temperature rises above the second control heat storage medium temperature,
In addition, the temperature detected by the first temperature detecting device is controlled.
If it exceeds the reference temperature difference, switch to liquid subcooling operation.
Patent Claims characterized in that operating mode switching means is provided.
Item 15. The heat storage refrigeration cycle device according to item 1.