JPH0593541A - Operation controlling method of heat storage system refrigerating cycle apparatus - Google Patents

Abstract

PURPOSE:To obtain a method for controlling an operation in a heat storage system refrigerating cycle apparatus which can effectively cool with an inexpensive midnight power fee by alleviating power using amount in a daytime by more efficiently using storage heat amount stored in a heat storage medium by a heat storage operation in a midnight power time zone. CONSTITUTION:A heat storage amount stored in a heat storage medium is used by a heat storage operation in a midnight power time zone by a heat storage system refrigerating cycle apparatus having a general cooling circuit, a liquid overcooling room cooler circuit, a cold storage condenser circuit and a heat storage circuit. Whether it is the midsummer or not is judged by electric control means, and the apparatus is controlled by switching a liquid overcooling room cooling operation, a cold storage condensing operation, a general room cooling operation by the electric control means as required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system control method for a heat storage type refrigeration cycle apparatus.

[0002]

2. Description of the Related Art In a heat storage type refrigerating apparatus as disclosed in, for example, Japanese Patent Laid-Open No. 63-116055, the refrigerant circulation pump must be operated in all operation modes, and the maximum capacity of the refrigerating cycle is required. It is necessary to secure a sufficient amount of refrigerant circulation to cover the above. This is not only against energy saving, but also has a problem that the cooling operation must be stopped when the refrigerant circulation pump has a trouble.

Therefore, as a device for solving the above problems, a heat storage type refrigeration cycle device as shown in FIGS. 10 to 15 has been developed. This device is configured as shown in FIG. That is, 1 is a compressor, 2 is a heat source side heat exchanger, 3 is a first expansion device, 4 is a usage side heat exchanger such as an indoor unit of an air conditioner, and 5 is an accumulator, which is sequentially connected to the above devices 1 to 4. The refrigeration cycle is formed.
A heat storage tank 6 stores a heat storage medium 7, for example, water therein. Reference numeral 8 denotes a heat storage medium circulation pump that circulates the heat storage medium 7 between the heat storage tank 6 and the heat storage heat exchanger 9, and 10 denotes a heat storage bypass passage that has the heat storage heat exchanger 9 and is sucked by the compressor 1. Side and the outlet side of the heat source side heat exchanger 2 are connected. Ten
a, 10b, 10c are switchgear for heat storage bypass passage, 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, 12 Is a second bypass passage for the throttle device that connects the inlet side and the outlet side of the second throttle device 11, 12a is an opening / closing device for the second bypass passage for the throttle device, and 13 is heat storage heat for one end. A first heat storage bypass path 13a connected between the outlet side of the exchanger 9 and the switchgear 10b, and the other end connected between the switchgear 10c and the inlet side of the first expansion device 3, 13a The first opening / closing device for the bypass path for utilizing heat storage.

At the time of heat storage operation which is the nighttime operation by the heat storage type refrigeration cycle apparatus having the above-mentioned structure, as shown in FIG. 12, the opening / closing devices 10c, 12a and 13a are closed and the opening / closing device is opened.
Open 10a, 10b, compressor 1 and heat storage medium circulation pump 8
Is operated, the high-temperature high-pressure gas refrigerant from the compressor 1 becomes
The heat is dissipated in the heat source side heat exchanger 2, condensed and liquefied by itself, and adiabatically expanded in the second expansion device 11 to become a low temperature liquid gas two-phase fluid and enter the heat storage heat exchanger 9 to generate heat from the heat storage medium 7. The gas from the compressor 1 via the accumulator 5
Return to. By this operation, low temperature heat is stored by freezing the water in the heat storage medium 7.

Further, during the liquid subcooling cooling operation, the opening / closing devices 10b, 10c are closed as shown in FIG.
When a and 13a are 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 radiates heat in the heat source side heat exchanger 2 and condenses itself into the second throttle. It enters the heat storage exchanger 9 through the device bypass passage 12. Here, the liquid refrigerant is further cooled by the heat storage medium 7 sent by the heat storage medium circulation pump 8 and becomes a supercooled liquid which is sent to the first expansion device 3, where it is adiabatically expanded and cooled to a low temperature liquid gas two. It becomes a phase fluid and enters the utilization side heat exchanger 4, where heat is taken from the surroundings to be cooled, and itself evaporates and gasifies, and then returns to the compressor 1 via the accumulator 5. When the operation at this time is represented on the Mollier diagram, as shown in FIG. 14, the operation is expanded laterally by the supercooling enthalpy, and the compressor input enthalpy Δid is the same as the evaporation enthalpy Δi1 for cooling. To Δi2.

During the refrigeration cycle of general cooling,
As shown in FIG. 15, the opening / closing devices 10a, 13a, 14a are closed, the opening / closing devices 10b, 10c, 12a are opened, and the heat storage medium circulation pump 8
When the compressor 1 is operated while stopped, the high-pressure gas refrigerant from the compressor 1 dissipates heat in the heat source side heat exchanger 2, condenses itself into liquid, and passes through the second throttle device bypass passage 12. It is sent to the first expansion device 3, where it adiabatically expands to become a low-temperature liquid gas two-phase fluid and enters the utilization side exchanger 4, where it takes heat from the surroundings to cool it, and evaporates itself to form gas. And returns to the compressor 1 through the accumulator 5. As a method of controlling the operation of this conventional device by each operation as described above,
Operation control as shown in 10 is performed. That is, the cooling operation is started, and the liquid supercooling cooling operation by the liquid supercooling cooling circuit is performed, and whether or not the residual heat amount of the heat storage amount stored in the heat storage medium by the heat storage operation by the heat storage circuit is a predetermined amount or not. When judged by the electric control means, if the residual heat amount is a predetermined amount, the liquid subcooling cooling operation is continued. If the residual heat amount is not the predetermined amount, the general cooling operation is switched to the general cooling operation. In this device which is operation-controlled as described above, the capacity during the liquid subcooling cooling operation is larger than the capacity during the general cooling operation by the amount of heat of supercooling. Therefore, the capacity of the equipment is determined by the performance during liquid subcooling operation. In addition, the general operation of the device is to perform heat storage operation at midnight at night, and perform liquid subcooling cooling operation when there is a predetermined amount of residual heat stored in the heat storage medium by this heat storage operation, and perform heat storage residual operation. When the amount is exhausted or when it is necessary to preserve the heat storage amount before entering the heat storage utilization operation time zone, cooling is performed by the refrigeration cycle operation of general cooling.

[0007]

However, in the above conventional heat storage type refrigeration cycle apparatus, the heat storage amount stored in the heat storage medium by the heat storage operation is utilized only in the liquid subcooling cooling operation due to its configuration. .. In the case of this liquid subcooling cooling operation, the heat storage utilization factor is Δ
i _u / Δi ₂ , that is, about 0.2 to 0.3, but the heat storage utilization rate is about the same even when the load is light. Therefore, even if the remaining amount of heat storage is sufficient, it is used only at the same rate, so that the amount of heat storage will become surplus when the load becomes light.
This means that in the above conventional heat storage refrigeration cycle device, heat storage cannot be efficiently used for the size of the heat storage tank, and although it is called heat storage use, the economic effect of using nighttime electric power is insufficient. Therefore, the problem remains in the society where the power control during the daytime is not sufficient. The present invention has been developed in view of the above points, and its purpose is to use the heat storage amount stored in the heat storage medium by the heat storage operation during the midnight power time more efficiently during the daytime. It is an object of the present invention to provide an operation control method for a heat storage type refrigeration cycle apparatus that reduces the amount of power used and can more effectively perform cooling and cooling at an inexpensive midnight power rate.

[0008]

In order to effectively achieve the above object, the present invention has the following structure.
That is, the compressor, the heat source side heat exchanger, the first expansion device,
And a refrigeration cycle formed by sequentially connecting the use side heat exchangers, and a suction side of the compressor having a heat storage heat exchanger,
A heat storage bypass path connecting the outlet side of the heat source side heat exchanger, and 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 a second bypass passage for the expansion device that connects the inlet side and the exit side of the second expansion device, and a heat storage device that accommodates a heat storage medium therein and is capable of exchanging heat with the heat storage heat exchanger. An inlet of the heat storage heat exchanger having a tank, a first heat storage use bypass passage connecting the outlet side of the heat storage heat exchanger and the inlet side of the first expansion device, and a refrigerant circulation pump. Side and above first
Whether or not it is within a predetermined period initially set by the electric control means by the heat storage type refrigeration cycle device having the second heat storage utilization bypass path connecting to the inlet side of the expansion device It is determined whether or not it is midsummer. If it is midsummer, the heat source side heat exchanger, the second expansion device bypass path, the heat storage heat exchanger, the first heat storage bypass path, and the first heat storage side The liquid supercooling cooling operation is performed by the liquid supercooling cooling circuit reaching the compressor via the expansion device and the utilization side heat exchanger, and at the same time as the midnight power time zone, the heat source side heat exchanger and the heat source side heat exchanger are provided. Throttling device, and determines by the electrical control means whether there is a predetermined amount of residual heat amount of the heat storage amount stored in the heat storage medium by the heat storage operation by the heat storage circuit to the compressor through the heat storage heat exchanger, If there is a certain amount of residual heat, continue Continue the supercooling cooling operation, if the residual heat amount is not a predetermined amount, switch to the general cooling cooling operation by the cooling circuit forming the refrigeration cycle, to perform the general cooling cooling operation, on the other hand, if it is determined not to be the midsummer, The cold storage condensing and cooling operation is performed by the cold storage condensing circuit that reaches the refrigerant circulation pump through the second heat storage utilization bypass path, the first expansion device, the use side heat exchanger, and the heat storage heat exchanger, and the heat storage is performed. Whether or not there is a predetermined amount of remaining amount is determined by the electric control means, and if the remaining amount of heat storage is a predetermined amount, the cold storage condensation cooling operation is continued, and if the remaining amount of heat storage is not the predetermined amount, the general cooling cooling operation is performed. The configuration is such that

Further, the heat storage type refrigeration cycle apparatus starts the cooling operation, and the electric control means judges whether or not the cooling rate of the room temperature becomes equal to or higher than a predetermined value or becomes equal to or lower than the set room temperature within a predetermined time, Except when the cooling rate of the room temperature is equal to or higher than a predetermined value or becomes lower than the set room temperature within a predetermined time, it is determined that it is midsummer, and the liquid subcooling cooling circuit performs the liquid subcooling cooling operation, and the cooling capacity is excessive. It is determined whether or not the output frequency of the inverter is below a predetermined value due to the capacity control of the compressor, and it is determined that the cooling capacity is excessive when the output frequency of the inverter is below a predetermined value. Then, the liquid subcooling cooling operation is switched to the cold storage condensation cooling operation by the cold storage condensation circuit, and whether the cooling load is excessive during this heat storage condensation cooling operation is determined by whether or not the evaporation temperature of the refrigerant has risen. Therefore, when the evaporation temperature of the refrigerant starts to rise, it is determined that the cooling load is excessive and the liquid subcooling cooling operation is switched again, and when it is determined that the cooling load is not excessive, the heat storage medium by the heat storage operation is performed. It is determined by the electric control means whether or not there is a predetermined amount of residual heat amount of the stored heat amount, and if the residual heat amount is a predetermined amount, the cold storage condensation cooling operation is continued, and if the residual heat amount is not the predetermined amount. When the general cooling / cooling operation is switched to the general cooling / cooling operation by the cooling circuit and the general cooling / cooling operation is performed, and when it is determined that the cooling capacity is not excessive or excessive, the residual heat amount of the heat storage amount stored in the heat storage medium is a predetermined amount. Whether or not it is determined by the electric control means, if the residual heat amount is a predetermined amount, the liquid subcooling cooling operation is continued, and if it is determined that the residual heat amount is not the predetermined amount, the general cooling cooling is performed. In order to perform the general cooling and cooling operation, on the other hand, when it is determined that it is not the midsummer, the cold storage condensation cooling operation is performed, and it is determined whether the cooling load is excessive during the heat storage condensation cooling operation. When it is determined that the cooling load is excessive, the liquid subcooling cooling operation is switched to, and when it is determined that the cooling load is not excessive, it is determined by the electric control means whether or not the residual heat amount is a predetermined amount, and If there is a predetermined amount of heat, the cold storage condensing operation is continued, and if there is no predetermined amount of residual heat, the cooling circuit is switched to the general cooling / cooling operation to perform the general cooling / cooling operation.

Further, the liquid subcooling cooling operation is performed for a predetermined time at the start of the cooling operation of the above and the above configuration.

[0011]

With the above-described structure, whether or not it is a midsummer is determined by whether or not it is within a predetermined period initially set by the electric control means, and when the operation of the heat storage refrigeration cycle apparatus is controlled, first, the midnight power time is set. The heat is stored in the heat storage medium by the heat storage operation by the heat storage circuit in the zone, and by the start of the cooling operation of the heat storage type refrigeration cycle device, it is judged whether or not it is the high summer by the electric control means, and if it is the high summer, the liquid subcooling cooling operation If it is not midsummer, cool storage condensation cooling operation is performed. Also, during each operation, it is determined whether or not the residual heat amount of the heat storage amount stored in the heat storage medium by the heat storage operation is a predetermined amount, and if the residual heat amount is a predetermined amount, the respective operations are continued, and if there is not, Switch to general cooling and cooling operation.

Further, whether or not it is a hot summer is judged by the electric control means whether or not the cooling rate of the room temperature becomes equal to or higher than a predetermined value or becomes equal to or lower than the set room temperature within a predetermined time, and the operation control of the heat storage type refrigeration cycle apparatus is performed. In the case, first of all,
It stores heat in the heat storage medium by the heat storage operation by the heat storage circuit in the midnight power time zone, and when the cooling operation of the heat storage type refrigeration cycle device starts, the electric control means detects the cooling rate or the state of room temperature to determine whether or not it is midsummer. If it is determined that it is midsummer, the liquid subcooling cooling operation is performed, and if it is not midsummer, the cold storage condensation cooling operation is performed.

During the above liquid supercooling cooling operation, whether or not the cooling capacity is excessive is judged by the electric control means, and if it is excessive, it is switched to the cold storage condensation cooling operation, and if it is not excessive, heat is further stored in the heat storage medium by the heat storage operation. It is determined whether or not the remaining heat amount of the stored heat amount is a predetermined amount, and if the remaining heat amount is a predetermined amount, the liquid subcooling cooling operation is continued, and if there is no remaining heat amount, it is switched to the general cooling operation. Further, during the cold storage condensation cooling operation, whether or not the cooling load is excessive is determined by the electric control means. If it is excessive, it is switched to the liquid subcooling cooling operation, and if it is not excessive, heat is further stored in the heat storage medium by the heat storage operation. Whether or not the residual heat amount of the stored heat amount is a predetermined amount is determined by the electric control means. If the residual heat amount is the predetermined amount, the cold storage condensation cooling operation is continued, and if there is no residual heat amount, it is switched to the general cooling operation.

Further, in the case of each operation control described above, the liquid subcooling cooling operation is first performed for a predetermined time at the start of the cooling operation,
During this period, various requirements for detecting whether or not it is midsummer by the electric control means are calculated and calculated. Further, the liquid subcooling cooling operation in this case also functions as a running-in operation of the entire heat storage refrigeration cycle apparatus at the start of the operation.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a flow chart of an operation control method according to an embodiment of the heat storage type refrigeration cycle apparatus according to the present invention.
6 is a flow chart of an operation control method of another embodiment. See also FIG.
FIG. 1 is an explanatory view showing a cycle of a heat storage type refrigerating apparatus according to the present invention, in which 1 is a compressor, 2 is a heat source side heat exchanger, 3 is a first expansion device, 4 is an air conditioner indoor unit, etc. User side heat exchanger, 5 is an accumulator,
4 are sequentially connected to form a refrigeration cycle. A heat storage tank 6 stores a heat storage medium 7, for example, water therein.

A heat storage medium circulating pump 8 circulates the heat storage medium 7 between the heat storage tank 6 and the heat storage heat exchanger 9.
Reference numeral 10 denotes a heat storage bypass path, which has a heat storage heat exchanger 9 and connects the suction side of the compressor 1 and the outlet side of the heat source side heat exchanger 2. Reference numerals 10a, 10b and 10c are heat storage bypass passage opening / closing devices, and 11 is a second expansion device for the heat source side heat exchanger 2
Is provided between the outlet side and the inlet side of the heat storage heat exchanger 9. Reference numeral 12 is a bypass passage for the second expansion device, which connects the inlet side and the outlet side of the second expansion device 11. 12a is the second
The opening / closing device for the bypass passage for the expansion device, 13 is the first bypass passage for heat storage, one end is between the outlet side of the heat storage heat exchanger 9 and the opening / closing device 10b, and the other end is the opening / closing device. Device 10
It is connected between c and the inlet side of the first expansion device 3. 13a is a switch device for the first heat storage use bypass passage, 14 is a second heat storage use bypass passage, and one end is between the inlet side of the heat storage heat exchanger 9 and the switch device 10a, The other end is connected between the opening / closing device 10c and the inlet side of the first expansion device 3. 14a is an opening / closing device for the second heat-storage-use bypass passage, and 15 is a refrigerant circulation pump, which is provided on the second heat-storage-use bypass passage 14, the capacity of which is the necessary circulation amount during the heat storage condensation operation. Will be decided. Next, the operation will be described.

FIG. 4 is a circuit diagram showing the operation during the heat storage operation, which is mainly the operation in the midnight power time zone.
When c, 12a, 13a, 14a are closed, switchgear 10a, 10b is opened, the refrigerant circulation pump 15 is stopped, and the compressor 1 and the heat storage medium circulation pump 8 are operated, the high temperature high pressure gas from the compressor 1 The refrigerant radiates heat in the heat source-side heat exchanger 2, condenses itself into a liquid, and adiabatically expands in the second expansion device 11 to become a low-temperature liquid-gas two-phase fluid, which enters the heat storage heat exchanger 9 and the heat storage medium 7 The heat is taken from the gas, and the gas is evaporated into gas and returns to the compressor 1 through the accumulator 5. By such an operation, low temperature heat is stored by connecting water in the heat storage medium 7 or the like.
In this embodiment, a heat storage medium circulation pump is used because a forced convection type heat storage heat exchanger is used, but the efficiency is higher than that of a generally used natural convection type pump, and This method is adopted because it can be expected to reduce the compressor power more than the addition.

FIGS. 5, 7, and 9 are operation diagrams of the cooling operation, and FIG. 5 is a circuit diagram during the cold storage condensation cooling operation. In this case, the switchgear 10a, 10b, 13a is closed, and the switchgear 10b,
When the refrigerant circulation pump 15 and the heat storage medium circulation pump 8 are operated with 14a opened and the compressor 1 stopped, the low temperature liquid medium condensed and liquefied in the heat storage heat exchanger 9 is generated by the refrigerant circulation pump 15. It is sent to the first diaphragm device 3. At this time, each of the plurality of first expansion devices 3 automatically adjusts the opening degree so that the liquid is evenly distributed to the plurality of usage-side heat exchangers 4. The liquid refrigerant of the low-temperature low-pressure side gas-liquid separation device, which has entered the use-side heat exchanger 4, takes heat from the surroundings and is cooled here, and evaporates and gasifies itself to return to the heat storage heat exchanger 9 to store the heat storage medium. It is cooled by the low temperature heat storage medium 7 sent by the circulation pump 8 and condensed again.

When the operation at this time is shown on the Mollier diagram,
As shown in FIG. 6, in this cold storage condensation cooling operation, the evaporation action is performed at a pressure almost equal to or slightly higher than the condensation pressure,
Moreover, since most of the heat transfer is covered by the latent heat change, the refrigerant circulation pump 15 has a margin that allows the liquid to circulate and absorbs the pressure loss for equal distribution of the liquid. A power pump will suffice, and the heat storage medium will have a high C.I. to consume the evaporation enthalpy Δie for cooling and almost the condensation enthalpy Δic of a colleague. O.
Achieve P operation. The English symbols in the figure indicate the state on the diagram at the position shown in FIG.

FIG. 7 shows a circuit diagram during the liquid subcooling cooling operation. In this case, close the switchgear 10b, 10c,
When a, 12a, 13a are opened and the refrigerant circulation pump 15 is stopped 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 is transferred to the heat source side heat exchanger 2
Then, the heat is dissipated, and the condensed liquid itself enters the heat storage exchanger 9 through the second bypass passage 12 for the expansion device. Here, the liquid refrigerant is further cooled by the heat storage medium 7 sent by the heat storage medium circulation pump 8 and becomes a supercooled liquid which is sent to the first expansion device 3, where it is adiabatically expanded and cooled to a low temperature liquid gas two. It becomes a phase fluid and enters the utilization side heat exchanger 4, where heat is taken from the surroundings to be cooled, and itself evaporates and gasifies, and then returns to the compressor 1 via the accumulator 5. When the operation at this time is represented on the Mollier diagram, as shown in FIG. 8, the operation is expanded laterally by the supercooling enthalpy, and the compressor input enthalpy Δid is the same as the evaporation enthalpy Δi1 for cooling. To Δi2.

FIG. 9 shows a circuit diagram during a refrigeration cycle operation of general cooling. In this case, switchgear 10a, 13a, 14a is closed, switchgear 10b, 10c, 12a is opened, refrigerant circulation pump
When the compressor 1 is operated with 15 and the heat storage medium circulation pump 8 stopped, the high-pressure high-pressure gas refrigerant from the compressor 1 radiates heat in the heat source side heat exchanger 2 and condenses itself into the second throttle. It is sent to the first expansion device 3 through the device bypass passage 12, where it is adiabatically expanded into a low-temperature liquid-gas two-phase fluid and enters the usage-side exchanger 4, where heat is taken from the surroundings and cooled. , Itself evaporates and gasifies, then passes through the accumulator 5 and the compressor 1
Return to. The cooling capacity of this system is larger than that in the refrigeration cycle operation of general cooling in the liquid supercooling / cooling operation by the amount of heat of supercooling, as in the conventional embodiment. Therefore, the capacity of the equipment is determined by the performance during 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 it by the cool storage condensation cooling operation, and the load is large. At this time, cooling by liquid subcooling cooling operation,
When there is no heat storage, or when it is necessary to save the amount of heat storage before entering the heat storage utilization operation time zone, cooling is performed by the refrigeration cycle operation of general cooling.

According to the operation control method of the embodiment shown in FIG. 1 by each operation control as described above, the cooling operation is started by the heat storage type refrigeration cycle apparatus, and first, for about 10 minutes,
The liquid subcooling cooling operation is performed. Then, whether or not it is the midsummer is determined by whether or not it is within an initially set predetermined period (on the calendar, the set midsummer period "for example, from 6/16 days to 8/30 days") by an electric control means such as a microcomputer. If it is a midsummer, the liquid subcooling cooling circuit performs the liquid subcooling cooling operation, and the residual heat amount of the heat storage amount stored in the heat storage medium by the heat storage operation by the heat storage circuit during the midnight power time period has a predetermined amount. Whether or not it is determined by the electric control means, if the residual heat amount is a predetermined amount, continue the liquid subcooling cooling operation,
If the residual heat amount is not a predetermined amount, the cooling circuit is switched to the general cooling / cooling operation to perform the general cooling / cooling operation.

On the other hand, when it is determined that it is not the midsummer, the cold storage condensation circuit performs the cold storage condensation cooling operation, and the electric control means determines whether or not the heat storage residual amount is a predetermined amount. If there is a predetermined amount, the above-mentioned cold storage condensation cooling operation is continued. If there is no predetermined amount of heat storage, the above general cooling operation is performed, and after a lapse of a predetermined time, the general cooling operation is arbitrarily stopped.

In the operation control method of another embodiment shown in FIG. 2, the cooling operation is started by the heat storage type refrigeration cycle apparatus, and the liquid subcooling cooling operation is first performed for about 10 minutes as in the embodiment. .. Then, the electric control means such as a microcomputer determines whether the cooling rate of the room temperature is 5 deg ° C. or higher in 10 minutes or becomes the set room temperature or lower within 10 minutes, and the cooling rate of the room temperature is 5 deg ° C. in 10 minutes. It is determined that it is midsummer except when the temperature falls below the set room temperature within the above or within 10 minutes, and while performing liquid subcooling cooling operation by the liquid subcooling cooling circuit, whether or not the cooling capacity is excessive, the compression is performed. The output frequency of the inverter is Max due to the capacity control of the machine 1.
If the output frequency of the inverter becomes 1/2 or less of the Max value, it is determined that the cooling capacity is excessive, and the cooling supercooling operation is performed from the liquid subcooling cooling operation. Switch to cold storage condensation cooling operation by circuit.

During this heat storage condensation cooling operation, whether or not the cooling load is excessive is judged by whether or not the evaporation temperature of the refrigerant has risen, and when the evaporation temperature of the refrigerant begins to rise, it is judged that the cooling load is excessive and the liquid is again returned. When it is determined that the cooling load is not excessive by switching to the supercooling cooling operation, it is determined by the electrical control means whether or not the residual heat amount of the heat storage amount stored in the heat storage medium by the heat storage operation by the heat storage circuit has a predetermined amount. If the residual heat amount is a predetermined amount, the cold storage condensation cooling operation is continued.

Further, if the residual heat amount is not a predetermined amount, the cooling circuit is switched to the general cooling / cooling operation to perform the general cooling / cooling operation, and when it is determined that the cooling capacity is not excessive, the heat storage medium is stored in the heat storage medium. It is judged by the electric control means whether or not the remaining heat amount of the stored heat storage amount is a predetermined amount, and if the remaining heat amount is a predetermined amount, the liquid subcooling cooling operation is continued, and if the remaining heat amount is not the predetermined amount. If determined, the general cooling / cooling operation is switched to and the general cooling / cooling operation is performed.

On the other hand, when it is determined that it is not the midsummer,
Performs the cold storage condensation cooling operation, determines whether the cooling load is excessive during the heat storage condensation cooling operation, and switches to the liquid subcooling cooling operation when it is determined that the cooling load is excessive, and the cooling load is not excessive. If it is determined that the residual heat amount is a predetermined amount by the electrical control means, if the residual heat amount is a predetermined amount, the cold storage condensation operation is continued, if the residual heat amount is not a predetermined amount, Switch to general cooling and cooling operation by the cooling circuit, perform general cooling and cooling operation,
After the lapse of a predetermined time, the general cooling and cooling operation is arbitrarily stopped.
Although each of the above embodiments has been described as being used for air conditioning, it can be used for other purposes such as freezing and refrigeration.

[0028]

As described above, according to the operation control method by the heat storage type refrigeration cycle device of the present invention as described above, the night shift rate of power use becomes high, and the user can perform cooling and cooling at a low night power charge. Yes, you can get more financial benefits. In addition, since the night shift rate of power usage is high as described above, it is possible to reduce the power usage rate in the daytime and contribute to society from the viewpoint of shifting the power demand. Further, in the case of the operation control method in which the electric control means determines whether it is a midsummer or not depending on whether it is within a preset predetermined period, the electric control means can be manufactured at low cost, and the initial setting value can be easily manually set. Can be used on site. Further, the electric control means determines whether the cooling rate of the room temperature is equal to or higher than a predetermined value or is equal to or lower than the set room temperature within a predetermined time, and the cooling rate of the room temperature is equal to or higher than the predetermined value or equal to or lower than the set room temperature within the predetermined time. In the case of the operation control method which determines that it is midsummer except when it is not, finer cooling and cooling control can be performed, and a more comfortable indoor space can be provided.
Further, by performing the liquid subcooling cooling operation for a predetermined time at the start of the cooling operation, the subsequent electric / mechanical operation control can be performed more smoothly.

[Brief description of drawings]

FIG. 1 is a flow chart of an operation control method according to an embodiment of the present invention.

FIG. 2 is a flow chart of an operation control method according to another embodiment of the present invention.

FIG. 3 is a cycle diagram of a heat storage type refrigeration cycle apparatus according to an embodiment of the present invention.

FIG. 4 is an operation diagram during heat storage operation.

[Fig. 5] Fig. 5 is an operation diagram during a cool storage condensation cooling operation.

FIG. 6 is a Mollier diagram during the cold storage condensation cooling operation.

FIG. 7 is an operation diagram during liquid subcooling cooling operation.

FIG. 8 is a Mollier diagram during liquid subcooling cooling operation.

FIG. 9 is an operation diagram during the refrigeration cycle operation of general cooling.

FIG. 10 is a flowchart of a conventional operation control method according to an embodiment.

FIG. 11 is a cycle diagram of a conventional heat storage type refrigeration cycle apparatus.

FIG. 12 is an operation diagram of a conventional heat storage operation.

FIG. 13 is an operation diagram during a conventional liquid subcooling cooling operation.

FIG. 14 is a Mollier diagram during a conventional liquid subcooling cooling operation.

FIG. 15 is an operation diagram during a refrigeration cycle operation of a conventional general cooling system.

[Explanation of symbols]

 1 Compressor 2 Heat source side 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 First heat storage bypass path 14 Second heat storage bypass path 15 Refrigerant circulation pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihisa Nakaso 1-3-15 Awaza, Nishi-ku, Osaka City Kashima Construction Co., Ltd. Osaka branch (72) Inventor Hiroaki Hama 6-5-6 Tehira, Wakayama City No. Mitsubishi Electric Co., Ltd. Wakayama Works

Claims (3)

[Claims] 1. A refrigeration cycle formed by sequentially connecting a compressor, a heat source side heat exchanger, a first expansion device, and a utilization side heat exchanger, and a heat storage heat exchanger. A heat storage bypass path that connects the suction side and the outlet side of the heat source side heat exchanger, and a second provided between the outlet side of the heat source side heat exchanger and the inlet side of the heat storage side heat exchanger. Diaphragm device,
A second connecting the inlet side and the outlet side of this second expansion device
A bypass passage for the expansion device, and a heat storage tank that accommodates a heat storage medium inside and is provided to be capable of exchanging heat with the heat exchanger for heat storage,
A first heat storage utilization bypass line connecting the outlet side of the heat storage heat exchanger and the inlet side of the first expansion device, and a refrigerant circulation pump, and the inlet side of the heat storage heat exchanger and the above. With the heat storage type refrigeration cycle device including the second heat storage utilization bypass path that connects the inlet side of the first expansion device,
The cooling operation is started, and whether or not it is the high summer is judged by whether or not it is within the initially set predetermined period by the electric control means. If it is the high summer, the compressor, the heat source side heat exchanger, and the second expansion device are used. A liquid subcooling cooling operation is performed by a liquid subcooling cooling circuit that reaches the compressor through the bypass passage, the heat storage heat exchanger, the first heat storage utilization bypass passage, the first expansion device, and the utilization side heat exchanger. The heat was stored in the heat storage medium by the heat storage operation by the 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 during the midnight power time period. The electric control means determines whether or not the residual heat amount of the stored heat amount is a predetermined amount, and if the residual heat amount is a predetermined amount, continues the liquid subcooling cooling operation, and if the residual heat amount is not the predetermined amount, the refrigeration cycle. Cooling by the cooling circuit that forms the When it is determined that it is not the midsummer, the second heat storage utilization bypass path, the first expansion device, the use side heat exchanger, and the heat storage heat exchange are switched to the operation and the general cooling operation is performed. While performing the cold storage condensation cooling operation by the cold storage condensation circuit to the refrigerant circulation pump through the device, the electric control means determines whether or not the heat storage residual amount is a predetermined amount, and if the heat storage residual amount is a predetermined amount. An operation control method in a heat storage type refrigeration cycle apparatus, characterized in that the cold storage condensation cooling operation is continuously continued, and the general cooling operation is performed if the remaining heat storage amount is not a predetermined amount. 2. The heat storage type refrigeration cycle apparatus starts a cooling operation, and the electric control means determines whether or not the room temperature cooling rate is equal to or higher than a predetermined value or is equal to or lower than a set room temperature within a predetermined time, Except when the cooling rate of the room temperature is equal to or higher than a predetermined value or becomes lower than the set room temperature within a predetermined time, it is determined that it is midsummer, and the liquid subcooling cooling circuit performs the liquid subcooling cooling operation, and the cooling capacity is excessive. It is determined whether or not the output frequency of the inverter is below a predetermined value due to the capacity control of the compressor, and it is determined that the cooling capacity is excessive when the output frequency of the inverter is below a predetermined value. The liquid supercooling cooling operation is switched to the cold storage condensation cooling operation by the cold storage condensation circuit, and whether the cooling load is excessive during this heat storage condensation cooling operation depends on whether the evaporation temperature of the refrigerant has risen. Judgment, when the evaporation temperature of the refrigerant begins to rise, it is determined that the cooling load is excessive and switched to the liquid subcooling cooling operation again, and when it is determined that the cooling load is not excessive,
The electric control means determines whether or not the remaining heat amount of the heat storage amount stored in the heat storage medium by the heat storage operation by the heat storage circuit is a predetermined amount, and if the remaining heat amount is the predetermined amount, the cold storage condensation cooling operation is continued. However, if the residual heat amount is not a predetermined amount, the cooling circuit is switched to the general cooling / cooling operation so that the general cooling / cooling operation is performed, and when it is determined that the cooling capacity is not excessive, the heat stored in the heat storage medium is stored. If the amount of residual heat is a predetermined amount is determined by the electric control means, if the residual heat amount is a predetermined amount, the liquid subcooling cooling operation is continued, and if it is determined that the residual heat amount is not the predetermined amount. , Switching to the general cooling and cooling operation, so as to perform the general cooling and cooling operation, on the other hand, when it is determined not to be the midsummer, perform the cold storage condensation cooling operation, during the heat storage condensation cooling operation If it is determined that the cooling load is excessive, it is switched to the liquid subcooling cooling operation when it is determined that the cooling load is excessive, and when it is determined that the cooling load is not excessive, whether the residual heat amount described above is a predetermined amount or not. Is determined by the electric control means, and if the residual heat amount is a predetermined amount, the cold storage condensation operation is continued, and if the residual heat amount is not the predetermined amount, the cooling circuit is switched to the general cooling / cooling operation to perform the general cooling / cooling operation. An operation control method in a heat storage type refrigeration cycle apparatus characterized by the above. 3. The operation control method in the heat storage refrigeration cycle apparatus according to claim 1, wherein the liquid subcooling cooling operation is performed for a predetermined time when the cooling operation starts.