Energy storage type air cooling module machine

Abstract

The utility model provides an energy storage type air cooling module machine. The energy storage type air cooling module machine comprises a compressor (1), a refrigerant-air heat exchanger (2), a refrigerant-water heat exchanger (3), an energy storage device (4), a four-way valve (5), a gas-liquid separator (6), a switching valve set (7), a liquid storage device (8), a drying filter (9) and an expansion valve (10). And the refrigerant directly enters the energy accumulator, so that the energy consumption of the secondary refrigerant pump is saved, the refrigeration efficiency is improved, and the system efficiency can be improved compared with the traditional ice storage. The air cooling module unit (namely the refrigerant-air heat exchanger) is adopted, the refrigeration efficiency of the air cooling module unit is related to the environment dry-bulb temperature, and the environment dry-bulb temperature is generally 8-10 DEG C lower than that in the daytime during the off-peak electricity period at night, so that a better environment is provided during ice making, and the refrigeration efficiency during ice making is improved. In addition, primary heat exchange is reduced, energy consumption of a secondary refrigerant pump is reduced, and environment factors of day and night temperature difference are utilized, so that the total storage and discharge efficiency is basically equivalent to that of direct cooling, and even can exceed that of direct cooling.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration technology, and in particular relates to an energy storage type air-cooled modular unit. Background Technology

[0002] Ice storage cooling technology utilizes off-peak electricity to store ice and melt it during peak electricity demand for cooling, thus playing a role in peak shaving and valley filling of the power grid and balancing the grid load. Users can also take advantage of the peak-valley electricity price difference to save on air conditioning operating costs. This technology is now widely used.

[0003] Currently, ice storage technology is mainly used in large-scale central air conditioning systems. During off-peak electricity hours at night, water-cooled units cool the refrigerant (usually a 25% ethylene glycol solution) to around -6°C, circulating it to an ice storage tank where the water freezes and stores the cold. During cooling, the terminal chilled water transfers heat to the refrigerant via a plate heat exchanger. The refrigerant circulates between the plate heat exchanger and the ice storage device, carrying away the cooling capacity from the ice storage tank. A typical connection diagram is shown below. Figure 1 As shown.

[0004] In traditional ice storage ice making, the heat exchange between the water / ice in the ice tank and the refrigerant must go through the intermediate stage of the refrigerant. Adding a stage of heat exchange usually requires a temperature difference of 2°C, which means that a lower evaporation temperature is required when making ice, resulting in lower refrigeration efficiency. Typically, the refrigeration efficiency decreases by about 3% for every 1°C decrease in evaporation temperature. Moreover, it requires an increase in the energy consumption of the refrigerant circulation, which accounts for about 15% of the refrigeration system. Utility Model Content

[0005] The purpose of this utility model is to provide an energy storage type air-cooled modular unit.

[0006] Therefore, the above-mentioned objective of this utility model is achieved through the following technical solution:

[0007] An energy storage type air-cooled modular air conditioner includes a compressor, a refrigerant-air heat exchanger, a refrigerant-water heat exchanger, an energy storage unit, a four-way valve, a gas-liquid separator, a switching valve group, a liquid receiver, a dryer filter, and an expansion valve.

[0008] The compressor's discharge end is connected to a four-way valve, and a gas-liquid separator is provided between the compressor's inlet end and the four-way valve.

[0009] One of the remaining two ports of the four-way valve is connected to the refrigerant-air heat exchanger; the other port is connected to the refrigerant-water heat exchanger via the first switching valve and to the energy storage device via the third switching valve.

[0010] The refrigerant-water heat exchanger is connected to the refrigerant-air heat exchanger via a second switching valve and a switching valve group;

[0011] The energy storage device is connected to the refrigerant-air heat exchanger via the fourth switching valve and the switching valve group;

[0012] The liquid reservoir, the dryer filter, and the expansion valve are connected in series, and the liquid always flows from the liquid reservoir to the dryer filter and the expansion valve.

[0013] The switching valve group is used to connect the refrigerant-air heat exchanger with the liquid receiver, the dryer filter, the expansion valve, and the liquid receiver, the dryer filter, the expansion valve with the refrigerant-water heat exchanger and the energy storage device, and is used to switch the refrigeration cycle link, the cold storage cycle link, the heating cycle link and the heat storage cycle link.

[0014] While adopting the above technical solutions, this utility model may also adopt or combine the following technical solutions:

[0015] As a preferred embodiment of this utility model: the switching valve group includes a first check valve, a second check valve, a third check valve, and a fourth check valve.

[0016] The first check valve is connected in series with the second check valve, and the third check valve is connected in series with the fourth check valve;

[0017] The first check valve, the second check valve, the third check valve, and the fourth check valve are all connected in parallel with the expansion valve, the dryer filter, and the liquid receiver.

[0018] The connection point between the first check valve and the second check valve is connected to the refrigerant-air heat exchanger.

[0019] The connection point between the third one-way valve and the fourth one-way valve is connected to the refrigerant-water heat exchanger via the second switching valve.

[0020] The connection point between the third and fourth check valves is connected to the energy storage device via the fourth switching valve.

[0021] As a preferred technical solution of this utility model: the first switching valve, the second switching valve, the third switching valve and the fourth switching valve are all electrically controlled switching valves.

[0022] As a preferred technical solution of this utility model, the expansion valve is an electronic expansion valve.

[0023] As a preferred technical solution of this utility model: the four-way valve is an electrically controlled four-way reversing valve.

[0024] As a preferred technical solution of this utility model: the energy storage device is an energy storage device with phase change material.

[0025] As a preferred technical solution of this utility model: the refrigerant-air heat exchanger is a finned tube heat exchanger.

[0026] As a preferred technical solution of this utility model, the refrigerant-water heat exchanger is a plate heat exchanger.

[0027] This invention provides an energy storage type air-cooled modular unit where refrigerant directly enters the energy storage tank, saving energy consumption of the refrigerant pump and improving refrigeration efficiency. Compared with traditional ice storage, it can improve system efficiency. Furthermore, traditional ice storage uses water-cooled refrigeration units, whose refrigeration efficiency is related to the outdoor wet-bulb temperature. Typically, a 1°C decrease in wet-bulb temperature increases refrigeration efficiency by 3.5%. Ambient wet-bulb temperature is relatively stable throughout the day, usually about 1°C lower during off-peak hours than during the day. This invention uses an air-cooled modular unit (i.e., a refrigerant-air heat exchanger), whose refrigeration efficiency is related to the ambient dry-bulb temperature. During off-peak hours, the ambient dry-bulb temperature is typically 8-10°C lower than during the day, thus providing a better environment for ice making and improving refrigeration efficiency during ice making. In addition, the overall efficiency of traditional ice storage is about 60% of that of direct cooling. This invention, by reducing one stage of heat exchange, reducing refrigerant pump energy consumption, and utilizing the diurnal temperature range, achieves an overall storage efficiency that is basically equivalent to, and may even exceed, direct cooling. Traditional ice storage technology has only two operating modes for the refrigeration unit: refrigeration and cold storage. This utility model has four operating modes: refrigeration, cold storage, heating, and heat storage. Attached Figure Description

[0028] Figure 1 for Figure 1 This is a structural diagram of an existing ice storage air conditioner.

[0029] Figure 2 This is a connection diagram of the energy storage type air-cooled module provided by this utility model. Detailed Implementation

[0030] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0031] An energy storage type air-cooled modular air conditioner includes a compressor 1, a refrigerant-air heat exchanger 2, a refrigerant-water heat exchanger 3, an energy storage unit 4, a four-way valve 5, a gas-liquid separator 6, a switching valve group 7, a liquid storage unit 8, a dryer filter 9, and an expansion valve 10.

[0032] The discharge end of compressor 1 is connected to four-way valve 5, and a gas-liquid separator 6 is provided between the intake end of compressor 1 and four-way valve 5.

[0033] One of the remaining two ports of the four-way valve 5 is connected to the refrigerant-air heat exchanger 2; the other port is connected to the refrigerant-water heat exchanger 3 via the first switching valve V1, and to the energy storage device 4 via the third switching valve V3.

[0034] The refrigerant-water heat exchanger 3 is connected to the refrigerant-air heat exchanger 2 via the second switching valve V2 and the switching valve group 7;

[0035] The energy storage device 4 is connected to the refrigerant-air heat exchanger 2 via the fourth switching valve V4 and the switching valve group 7;

[0036] The liquid reservoir 8, the dryer filter 9, and the expansion valve 10 are connected in series, and the liquid flow direction is always from the liquid reservoir 8 to the dryer filter 9 and the expansion valve 10;

[0037] The switching valve group 7 is used to connect the refrigerant-air heat exchanger 2 with the liquid receiver 8, the dryer filter 9, and the expansion valve 10, as well as the liquid receiver 8, the dryer filter 9, and the expansion valve 10 with the refrigerant-water heat exchanger 3 and the energy storage unit 4, and is used to switch the refrigeration cycle link, the cold storage cycle link, the heating cycle link, and the heat storage cycle link.

[0038] The first switching valve V1, the second switching valve V2, the third switching valve V3, and the fourth switching valve V4 are all electrically controlled switching valves.

[0039] Four-way valve 5 is an electrically controlled four-way directional valve, and expansion valve 10 is an electronic expansion valve.

[0040] Energy storage device 4 is an energy storage device with phase change material.

[0041] The refrigerant-air heat exchanger 2 is a finned tube heat exchanger.

[0042] The refrigerant-water heat exchanger 3 is a plate heat exchanger.

[0043] The switching valve group 7 includes a first check valve CV1, a second check valve CV2, a third check valve CV3, and a fourth check valve CV4.

[0044] The first check valve CV1 is connected in series with the second check valve CV2, and the third check valve CV3 is connected in series with the fourth check valve CV4.

[0045] The first check valve CV1, the second check valve CV2, the third check valve CV3, and the fourth check valve CV4 are all connected in parallel with the expansion valve 10, the dryer filter 9, and the liquid reservoir 8.

[0046] The connection point between the first one-way valve CV1 and the second one-way valve CV2 is connected to the refrigerant-air heat exchanger 2.

[0047] The connection point between the third check valve CV3 and the fourth check valve CV4 is connected to the refrigerant-water heat exchanger 3 via the second switching valve V2.

[0048] The connection point between the third check valve CV3 and the fourth check valve CV4 is connected to the energy storage device 4 via the fourth switching valve V4.

[0049] Specifically, the following demonstrates the four operating conditions of the energy storage air-cooled modular unit provided by this utility model:

[0050] Refrigeration cycle conditions:

[0051] Low-temperature, low-pressure refrigerant gas is compressed into high-temperature, high-pressure gas by the compressor and passes through the four-way valve ad. After releasing heat into the ambient air in the refrigerant-air heat exchanger, it condenses into a medium-temperature, high-pressure liquid. It then passes through the second one-way valve CV2, the receiver, and the dryer filter. After expanding through the electronic expansion valve, it becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant. It then passes through the third one-way valve CV3 and the second switching valve V2 into the refrigerant-water heat exchanger, where it absorbs heat from the chilled water and evaporates into a low-temperature, low-pressure gas. Finally, it passes through the first switching valve V1, the four-way valve cb, the gas-liquid separator, and returns to the compressor, completing the refrigeration cycle.

[0052] Cold storage cycle operation:

[0053] Low-temperature, low-pressure refrigerant gas is compressed into high-temperature, high-pressure gas by the compressor. After passing through the four-way valve ad, it releases heat into the ambient air in the refrigerant-air heat exchanger and condenses into a medium-temperature, high-pressure liquid. It then passes through the second one-way valve CV2, the receiver, and the dryer filter. After expanding through the electronic expansion valve, it becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant. It then passes through the third one-way valve CV3 and the fourth switching valve V4, enters the accumulator, absorbs heat from the accumulator's energy storage medium, and evaporates into a low-temperature, low-pressure gas. Finally, it passes through the third switching valve V3, the four-way valve cb, and the gas-liquid separator, returning to the compressor to complete the cold storage cycle.

[0054] Heating cycle operation:

[0055] Low-temperature, low-pressure refrigerant gas is compressed into high-temperature, high-pressure gas by the compressor. After passing through the four-way valve ac and the first switching valve V1, it releases heat in the refrigerant-water heat exchanger and condenses into a medium-temperature, high-pressure liquid. After passing through the second switching valve V2, the fourth one-way valve CV4, the liquid receiver, and the dryer filter, it expands through the electronic expansion valve and becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant. After passing through the first one-way valve CV1, it enters the refrigerant-air heat exchanger, absorbs heat from the ambient air, and evaporates into a low-temperature, low-pressure gas. After passing through the four-way valve db and the gas-liquid separator, it returns to the compressor, completing the heating cycle.

[0056] Thermal storage cycle operation:

[0057] Low-temperature, low-pressure refrigerant gas is compressed into high-temperature, high-pressure gas by the compressor. After passing through the four-way valve ac and the third switching valve V3, it releases heat in the accumulator and condenses into a medium-temperature, high-pressure liquid. After passing through the fourth switching valve V4, the fourth one-way valve CV4, the liquid receiver, and the dryer filter, it expands through the electronic expansion valve and becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant. After passing through the first one-way valve CV1, it enters the refrigerant-air heat exchanger, absorbs heat from the ambient air, and evaporates into a low-temperature, low-pressure gas. After passing through the four-way valve db and the gas-liquid separator, it returns to the compressor, completing the heat storage cycle.

[0058] The above specific embodiments are used to explain and illustrate the present utility model, and are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made to the present utility model within the spirit and protection scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A storage-type air-cooled modular air conditioner, characterized in that: Includes a compressor (1), a refrigerant-air heat exchanger (2), a refrigerant-water heat exchanger (3), an energy storage unit (4), a four-way valve (5), a gas-liquid separator (6), a switching valve assembly (7), a liquid receiver (8), a dryer filter (9), and an expansion valve (10). The exhaust end of the compressor (1) is connected to the four-way valve (5), and a gas-liquid separator (6) is provided between the intake end of the compressor (1) and the four-way valve (5). One of the remaining two ports of the four-way valve (5) is connected to the refrigerant-air heat exchanger (2); the other port is connected to the refrigerant-water heat exchanger (3) via the first switching valve (V1) and to the energy storage device (4) via the third switching valve (V3). The refrigerant-water heat exchanger (3) is connected to the refrigerant-air heat exchanger (2) via the second switching valve (V2) and the switching valve group (7); The energy storage device (4) is connected to the refrigerant-air heat exchanger (2) via the fourth switching valve (V4) and the switching valve group (7); The liquid reservoir (8), the dryer filter (9), and the expansion valve (10) are connected in series and the liquid flow direction is always from the liquid reservoir (8) to the dryer filter (9) and the expansion valve (10). The switching valve group (7) is used to connect the refrigerant-air heat exchanger (2) with the liquid receiver (8), the dryer filter (9), the expansion valve (10), and the liquid receiver (8), the dryer filter (9), the expansion valve (10) with the refrigerant-water heat exchanger (3) and the energy storage device (4), and is used to switch the refrigeration cycle link, the cold storage cycle link, the heating cycle link and the heat storage cycle link.

2. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The switching valve group (7) includes a first check valve (CV1), a second check valve (CV2), a third check valve (CV3), and a fourth check valve (CV4). The first check valve (CV1) is connected in series with the second check valve (CV2), and the third check valve (CV3) is connected in series with the fourth check valve (CV4). The first check valve (CV1), the second check valve (CV2), the third check valve (CV3), and the fourth check valve (CV4) are all connected in parallel with the expansion valve (10), the dryer filter (9), and the liquid reservoir (8); The connection point between the first check valve (CV1) and the second check valve (CV2) is connected to the refrigerant-air heat exchanger (2); The connection point between the third check valve (CV3) and the fourth check valve (CV4) is connected to the refrigerant-water heat exchanger (3) via the second switching valve (V2); The connection point between the third check valve (CV3) and the fourth check valve (CV4) is connected to the energy storage device (4) via the fourth switching valve (V4).

3. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The first switching valve (V1), the second switching valve (V2), the third switching valve (V3), and the fourth switching valve (V4) are all electrically controlled switching valves.

4. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The expansion valve (10) is an electronic expansion valve.

5. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The four-way valve (5) is an electrically controlled four-way directional valve.

6. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The energy storage device (4) is an energy storage device with phase change material.

7. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The refrigerant-air heat exchanger (2) is a finned tube heat exchanger.

8. The energy storage type air-cooled modular air conditioner according to claim 1, characterized in that: The refrigerant-water heat exchanger (3) is a plate heat exchanger.

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