JP2705270B2 - Thermal storage refrigeration cycle device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat storage refrigeration cycle apparatus having a heat storage tank.

[Prior Art] Hereinafter, a conventional example will be described. That is, FIG. 8 is a cycle explanatory view showing a conventional regenerative refrigerating apparatus disclosed in, for example, JP-A-63-116055, wherein (1) is a compressor, and (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, and (6) is a heat storage tank, in which a heat storage medium (7) and a heat exchanger (9) are housed. . The heat exchanger (9) has a heat storage heat exchanger (92) and a heat storage heat exchanger (91). (10) is the first heat storage bypass path,
(10a) and (10b) are opening / closing devices for the first heat storage bypass path, (11) are second expansion devices (13) are heat storage utilization bypass paths, and (13a) and (13b) are heat storage utilization bypass paths. (15) is a refrigerant circulation pump, (16) is a low-pressure side gas-liquid separator, (17) is a high-pressure side liquid reservoir, (18) is a second heat storage bypass path, and (18a) (18b) shows a switching device for the second heat storage bypass path.

 Next, the operation will be described.

Thermal storage operation, that is, the thermal storage medium (7) in the thermal storage tank (6)
Close the switchgear (10b) (13a) (18a) to store low-temperature heat by freezing the water
0a) When (13b) and (18b) are opened and the compressor (1) and the refrigerant circulation pump (15) are operated, the high-temperature and high-pressure gas refrigerant from the compressor (1) passes through the heat source side heat exchanger (2). Dissipates heat, turns itself into pseudo-condensed liquid, pool (17), heat storage bypass (13)
After that, the adiabatic expansion is performed by the second expansion device (11), and the low-pressure liquid-gas two-phase fluid enters the low-pressure side gas-liquid separation device (16).
Here, only the low-temperature liquid enters the heat-storage heat exchanger (92) through the second heat-storage bypass (18) by the refrigerant circulation pump (15), takes heat from the heat-storage medium (7), and evaporates itself. It is gasified and returns to the low-pressure side gas-liquid separator (16), and returns to the compressor (1) together with the aforementioned gas.

The cooling operation has three types of operation methods in which heat absorbed by the indoor use side heat exchanger (4) is radiated.

The first is a method in which all the heat is discarded to the heat storage medium, and all the pseudo-shrinkage loads are covered by the cold storage heat. This operation is a switchgear (10b)
(18a) is closed, the switching devices (10a) and (18a) are opened, the compressor (1) is stopped, and only the refrigerant circulation pump (15) is operated. 4) through a first aperture device (3). Here, heat is taken from the surroundings to cool, and the gas itself evaporates and is gasified and sent to the heat storage heat exchanger (92). Here, the gas is cooled by the low-temperature heat storage medium (7), and is pseudo-shrinked to become a low-temperature liquid and returns to the low-pressure side gas-liquid separator (16).

The second method is to dissipate heat to both the atmosphere and the heat storage medium.
Since the liquid refrigerant simulated by the heat source-side heat exchanger (2) is further cooled by cold storage heat, it is hereinafter referred to as a liquid supercooling operation. This operation is performed by closing the switchgears (10a) (13b) (18b) and opening the switchgears (10b) (13a) (18a) to operate the compressor (1) and the refrigerant circulation pump (15). The high-temperature and high-pressure gas refrigerant from the machine (1) radiates heat in the heat-source-side heat exchanger (2), liquefies itself, 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), itself becomes a supercooled liquid, adiabatically expanded by the second expansion device (11), becomes a low-temperature liquid-gas two-phase fluid, and becomes low-pressure liquid. Enter the side gas-liquid separator (16). Here, only the low-temperature liquid is sent to the use side heat exchanger (4) via the first expansion device (3) by the refrigerant circulation pump (15). Here, it cools by taking heat from the surroundings, evaporates and gasifies itself, returns to the low-pressure side gas-liquid separator (16) via the first heat storage bypass (10), and is compressed together with the aforementioned gas. Return to the machine.

The third is a method of releasing heat only to the atmosphere, which is called an ordinary cooling refrigeration cycle operation because the operation is unrelated to heat storage. This operation is performed by the switchgear (10a) (13a) (18b)
Is closed, the switchgears (10b), (13b), and (18a) are opened, and the compressor (1) and the refrigerant circulation pump (15) are operated, so that the compressor (1), the heat source side heat exchanger (2), the liquid The reservoir (17), the heat storage utilization bypass path (13), the second expansion device (11), and the low-pressure gas-liquid separator (16) operate in the same manner as in the above-described heat storage operation, and the refrigerant circulation pump (15) , A first diaphragm device (3),
User side heat exchanger (4), first heat storage bypass (1
0) and the low-pressure side gas-liquid separator (16) operate in the same manner as in the above liquid supercooling operation.

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

[Problems to be Solved by the Invention] Since the conventional regenerative refrigeration cycle apparatus is configured as described above, the refrigerant circulation pump (15) must operate in all operation modes, and the refrigeration cycle Therefore, there is a problem that not only energy saving but also cooling must be stopped when trouble occurs in the refrigerant circulation pump (15).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a regenerative refrigeration cycle device that is inexpensive, energy-saving, and hardly causes troubles such as a need to stop a cooling operation. And

[Means for Solving the Problems] A regenerative refrigeration cycle apparatus according to claim 1 of the present invention is configured by sequentially connecting a compressor, a heat source side heat exchanger, a first expansion device, and a use side heat exchanger. A refrigerating cycle formed, a heat storage bypass having a heat storage heat exchanger, connecting a suction side of the compressor and an outlet side of the heat source side heat exchanger and formed during a heat storage operation, and a heat storage side. A second expansion device provided between an outlet side of the heat exchanger and one end of the heat storage heat exchanger, and an inlet and an outlet side of the second expansion device connected to provide general cooling and liquid supply; A second bypass path for the expansion device formed during the supercooling operation, a heat storage tank containing a heat storage medium therein and provided so as to be capable of exchanging heat with the heat storage heat exchanger, and a heat storage heat exchanger. Connect the end side to the inlet side of the first expansion device, and perform the operation during the cool storage pseudo shrinkage operation and the liquid supercooling operation. And a heat-source-side heat exchanger bypass passage formed at the time of cold storage pseudo-shrinkage operation connecting the inlet side of the heat source-side heat exchanger and the outlet side of the second expansion device. Provided, at the time of general cooling, a cooling circuit from the compressor to the compressor via the heat source side heat exchanger, the first expansion device, the use side heat exchanger, etc. A heat storage circuit from the compressor to the compressor through the heat source side heat exchanger, the second expansion device, the heat storage heat exchanger, and the like. In the gas state, the heat storage heat exchanger, the heat storage utilization bypass,
During the liquid subcooling operation, the cool storage / shrinkage circuit leading to the compressor via the first expansion device and the use side heat exchanger,
From the compressor to the heat source side heat exchanger, the heat storage heat exchanger, the heat storage utilization bypass, the first throttle device,
And a liquid subcooling circuit to the compressor via the use side heat exchanger and the like, respectively, and during cooling operation using heat storage, the cool storage pseudo shrinkage operation and the liquid subcooling operation are performed according to load. The switching operation is performed. When the cooling load is small, the cool storage pseudo shrinkage operation is performed. When the cooling load is large, the liquid supercooling operation is performed. When the heat storage is lost, the general cooling is performed.

According to a second aspect of the present invention, in the heat storage refrigeration cycle apparatus according to the above invention, a heat storage medium transfer device is provided between the heat storage tank and the heat storage heat exchanger, and the heat storage heat exchanger is a forced convection type heat storage. It was a heat exchanger.

[Operation] In the refrigerant cycle of the refrigeration cycle according to the present invention, in all of the heat storage operation, the cold storage pseudo-shrinkage operation, the liquid supercooling operation, and the general cooling operation, only the compressor is used without using the refrigerant circulation pump. To achieve. In addition, during cold storage operation, although the compressor operates, a high COP (Coeffic
ent Of Performance (coefficient of performance).

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

FIG. 1 is an explanatory view showing a cycle of a regenerative refrigeration system according to the present invention, wherein (1) is a compressor, and (2) is a diagram.
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, and is sequentially connected to (1) to (4). Thus, a refrigeration cycle is formed, and the first expansion device (3) is connected to the use-side heat exchanger (4) directly in the vicinity of the heat exchanger (4).
(6) is a heat storage tank, in which a heat storage medium (7) is circulated between the heat storage tank (6) and the heat exchanger (9) for heat storage. A heat storage heat exchanger (9), which connects the suction side of the compressor (1) and the outlet side of the heat source side heat exchanger (2). (10a), (10b), and (10c) are opening / closing devices for a heat storage bypass path, and (11) is an outlet between a heat source side heat exchanger (2) and one end of an inlet of a heat storage heat exchanger (9). A second throttle device provided between the second throttle device and the second throttle device connects the inlet side and the outlet side of the second throttle device, and the second throttle device has a second bypass device. (13) has one end between the other end of the outlet of the heat storage heat exchanger (9) and the opening / closing device (10b), and the other end has the opening / closing device (1).
0c) and a heat storage bypass path connected between the inlet side of the first expansion device (3), (13a) a switching device for the heat storage bypass path, and (14) a heat source side heat source. Exchanger (2)
(14a) and (14b) are opening / closing devices for the heat-source-side heat exchanger departure bypass, connecting the inlet side and the outlet side of the heat-source side heat exchanger.

 Next, the operation will be described.

FIG. 2 is a circuit diagram showing an operation during a heat storage operation, which is mainly an operation at night, and includes switching devices (10c), (12a), and (13).
a) Close (14a), open the switchgear (10a) (10b) (14b), and operate the compressor (1) and the heat storage medium circulating pump (8) to obtain the high-temperature and high-pressure gas from the compressor (1). The refrigerant is
Heat is radiated by the heat source side heat exchanger (2), which itself is pseudo-condensed,
Adiabatic expansion by the expansion device (11), a low-temperature liquid-gas two-phase fluid as a low-temperature liquid-gas two-phase fluid, enters the heat storage heat exchanger (9), and removes heat from the heat storage medium (7) sent by the heat storage medium circulation pump (8). They rob themselves and evaporate and return to the compressor (1) via the accumulator (5).

By this operation, low-temperature heat is stored by freezing water in the heat storage medium (7). In this embodiment, since a forced convection type heat storage heat exchanger is employed, a heat storage medium circulation pump is used. However, this method is adopted because the efficiency is higher than the generally used natural convection type, and the compressor power can be expected to decrease more than by adding pump power.

FIGS. 3, 5, and 7 are operation diagrams of the cooling operation,
FIG. 3 shows a circuit diagram during the cold storage pseudo shrinkage cooling operation. In this case, the switchgears (10b), (10c), (12a), and (14b) are closed, the switchgears (10a), (13a), and (14a) are opened, and the compressor (1) and the heat storage medium circulation pump (8) are operated. And the compressor (1)
The higher-temperature and high-pressure gas refrigerant enters the heat-storage heat exchanger (9) through the heat-source-side heat exchanger bypass path (14) and the second expansion device bypass path (12), and flows into the heat storage medium circulation pump (8).
Is cooled by the heat storage medium (7) fed by the heat exchanger, and is quasi-condensed, adiabatically expanded by the first expansion device (3), becomes a low-temperature liquid-gas two-phase fluid, and becomes a use-side heat exchanger (4). , Where it cools by removing heat from the surroundings, evaporates and gasifies, and returns to the compressor (1) via the accumulator (5).

When the operation at this time is represented on a Mollier diagram, as shown in FIG. 4, the operation becomes a low compression ratio operation in which the pseudo-compression pressure is suppressed low, the compressor input enthalpy (Δid) is extremely small, and Quasi-shrinkage enthalpy (Δic) which is almost the same as the evaporation enthalpy (Δie) of the heat storage medium. It should be noted that the English symbols in the figure indicate the positions on the diagram at the positions shown in FIG.

FIG. 5 shows a circuit diagram during the liquid subcooling cooling operation. In this case, the switching devices (10b), (10c), and (14a) are closed, and the switching devices (10a), (12a), (13a), and (14b) are opened, and the compressor (1) and the heat storage medium circulating pump (8) are operated. And the high-temperature and high-pressure gas refrigerant from the compressor (1) radiates heat in the heat source side heat exchanger (2), liquefies itself and passes through the second expansion device bypass passage (12) to exchange heat for heat storage. Enter the vessel (9). Here, the liquid refrigerant is further cooled by the heat storage medium (7) sent by the heat storage medium circulation pump (8) and is sent to the first expansion device (3) as a supercooled liquid, where the adiabatic expansion is performed. Then, it becomes a low-temperature liquid-gas two-phase fluid and enters the utilization side heat exchanger (4), where it cools by removing heat from the surroundings, evaporates and gasifies itself, and passes through the accumulator (5) to the compressor ( Return to 1). When the operation at this time is represented on a Mollier diagram, as shown in FIG. 6, the operation becomes a laterally spread operation only by the supercooling enthalpy, and the compressor input enthalpy (Δ
id) is as it is, steam enthalpy for cooling (Δi1)
To (Δi2).

FIG. 7 shows a circuit diagram during a refrigeration cycle operation of general cooling. In this case, when the switchgears (10a), (13a), and (14a) are closed and the switchgears (10b), (10c), (12a), and (14b) are opened and the compressor (1) is operated, the compressor (1) The high-temperature and high-pressure gaseous refrigerant is radiated by the heat source side heat exchanger (2), is quasi-condensed, and passes through the second expansion device bypass passage (12) to the first
And then adiabatically expanded to become a low-temperature liquid-gas two-phase fluid and enter the use-side heat exchanger (4), where it takes heat from the surroundings to cool it and evaporates itself To gasify and return to the compressor (1) via the accumulator (5).

As in the conventional embodiments, the cooling capacity of the system during the liquefied cooling operation is larger than the capacity during the refrigeration cycle operation of the general cooling by the amount of the supercooled heat. Therefore, the capacity of the equipment is determined by the performance during the liquid supercooling cooling operation, the general operation of the system performs the heat storage operation at night, and when the load is small, the cooling is performed by the cold storage pseudo shrinkage cooling operation,
When the load is large, cooling is performed by liquid supercooling cooling, and when heat storage is lost, or when it is necessary to preserve the heat storage amount before entering the heat storage use operation time period, cooling is performed by a refrigeration cycle operation of general cooling.

In the above embodiment, the case where the air conditioner is used for air conditioning is described, but the present invention can be used for other uses such as freezing and refrigeration.

〔The invention's effect〕

As described above, the present invention provides a compressor, a heat source side heat exchanger,
A refrigeration cycle formed by sequentially connecting the first expansion device and the use-side heat exchanger; and a heat-storage heat exchanger including a suction side of the compressor and an outlet side of the heat-source-side heat exchanger. A second storage device connected between the outlet side of the heat source side heat exchanger and one end of the heat storage heat exchanger, the second expansion device being connected to the bypass passage formed during the heat storage operation; A second bypass path for the expansion device, which is formed at the time of general cooling and subcooling operation by connecting the inlet side and the outlet side of the expansion device, and exchanges heat with the heat storage heat exchanger containing a heat storage medium therein. A heat storage tank provided so as to be capable of being provided, the other end of the heat storage heat exchanger and the first heat storage tank,
A heat storage utilization bypass path formed during the cold storage pseudo-shrinking operation and the liquid subcooling operation, and the inlet side of the heat source side heat exchanger and the outlet side of the second throttle unit. And a bypass for the heat source side heat exchanger formed at the time of the cold storage pseudo-shrinkage operation. In general cooling, the compressor is connected to the heat source side heat exchanger, the first expansion device, and the use side. The cooling circuit from the compressor through the heat exchanger and the like, during the heat storage operation, from the compressor through the heat source side heat exchanger, the second expansion device, the heat storage heat exchanger and the like When the heat storage circuit leading to the compressor is operated in the cold storage pseudo-shrinkage operation, the heat storage heat exchanger, the heat storage utilization bypass, the first throttle device, and the utilization side heat are supplied from the compressor in a high-pressure gas state. The cool storage pseudo compression circuit leading to the compressor via an exchanger etc. At the time, from the compressor to the compressor via the heat source side heat exchanger, the heat storage heat exchanger, the heat storage utilization bypass path, the first throttle device, the utilization side heat exchanger, etc. Each of the liquid subcooling circuits is configured to perform the operation of switching between the cold storage pseudo-shrinking operation and the liquid supercooling operation according to the load during the cooling operation using the heat storage, so that the heat storage operation and the cold storage pseudo-shrinking operation are performed. All the operation modes of the liquid supercooling operation and the general cooling operation can be operated extremely effectively according to the magnitude of the cooling load, and further, unlike the conventional case, there is no need to provide a refrigerant circulation pump separately from the compressor. It is possible to obtain a system that is inexpensive, has high energy savings, and is less likely to cause troubles such as the need to stop cooling.When the cooling load is small, the cool storage operation is performed, and when the cooling load is large, Performs a liquid supercooling operation and performs general cooling when heat storage is lost.Therefore, consumption of heat storage by the cool storage pseudo shrinkage operation when the cooling load is small is small, and when the cooling load is large, the heat storage amount is small. However, it is possible to perform liquid subcooling operation with large cooling capacity by using heat storage, suppress power consumption at the peak load, and switch to general cooling when heat storage is exhausted, eliminating residual heat storage and sufficient heat storage Can be used up,
There is an effect that it contributes to the effective use of heat storage and the leveling of power consumption.

Also, a heat storage medium transfer device is provided between the heat storage tank and the heat storage heat exchanger, and the heat storage heat exchanger is a forced convection type heat storage heat exchanger. This has the effect that a reduction in compressor power can be expected.

[Brief description of the drawings]

FIG. 1 is a cycle diagram of a regenerative refrigeration cycle apparatus according to one embodiment of the present invention, FIG. 2 is an operation diagram during a heat storage operation, and FIG.
Fig. 4 is an operation diagram during the cold storage pseudo shrinkage cooling operation, Fig. 4 is a Mollier diagram thereof, Fig. 5 is an operation diagram during the liquid supercooling cooling operation, Fig. 6 is a Mollier diagram thereof, and Fig. 7 is general cooling. FIG. 8 is a cycle diagram of a conventional regenerative refrigeration cycle apparatus during a refrigeration cycle operation. (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, (6) is a heat storage tank, and (7) is a heat storage medium. , (9) are heat exchangers for heat storage, (1
0) is a bypass path for heat storage, (11) is a second expansion device, (1)
2) denotes a second bypass path for the expansion device, (13) denotes a bypass path for heat storage use, and (14) denotes a bypass path for the heat source side heat exchanger. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

(57) [Claims] 1. A compressor having 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 a heat storage heat exchanger. A heat storage bypass formed by connecting the suction side and the outlet side of the heat source side heat exchanger during the heat storage operation, and between the outlet side of the heat source side heat exchanger and one end side of the heat storage heat exchanger; A second expansion device provided in the second expansion device, a second expansion device bypass passage connecting the inlet side and the outlet side of the second expansion device and formed during general cooling and liquid supercooling operations, and A heat storage tank that houses a heat storage medium and is provided so as to be capable of exchanging heat with the heat storage heat exchanger; and connecting the other end of the heat storage heat exchanger and the inlet side of the first expansion device to form a cool storage pseudo shrinkage. A heat storage utilization bypass formed during operation and subcooling operation, an inlet side of the heat source side heat exchanger and the second A heat-source-side heat exchanger bypass path formed at the time of cold storage pseudo-shrinkage operation by connecting to an outlet side of the expansion device; and during general cooling, the compressor is connected to the heat source-side heat exchanger, the first expansion device. And a cooling circuit from the compressor to the heat source side heat exchanger, the second expansion device, and the heat storage heat exchange during the heat storage operation. The heat storage circuit leading to the compressor via a compressor or the like, during the cold storage pseudo-shrinkage operation, the heat storage heat exchanger, the heat storage utilization bypass, the first expansion device, And the cool storage pseudo compression circuit to the compressor via the use side heat exchanger, etc., during the liquid supercooling operation, from the compressor to the heat source side heat exchanger,
A liquid supercooling circuit is provided to the compressor via the heat storage heat exchanger, the heat storage use bypass path, the first expansion device, the use side heat exchanger, etc. During operation, the operation is switched between the cool storage pseudo-shrinking operation and the liquid supercooling operation according to the load.When the cooling load is small, the cool storage pseudo-shrinkage operation is performed, and when the cooling load is large, the liquid subcooling operation is performed. And performing the above-described general cooling when the heat storage is exhausted. 2. The heat storage heat exchanger according to claim 1, wherein a heat storage medium transport device is provided between the heat storage tank and the heat storage heat exchanger, and the heat storage heat exchanger is a forced convection type heat storage heat exchanger. Heat storage refrigeration cycle device.