An air-cooled chiller system with enhanced air cooling

Abstract

The application discloses a forced air cooling cold water refrigeration system with reinforced air cooling, which comprises a refrigeration system and a cold carrier system. The refrigeration system comprises a compressor, a forced air cooling condenser, an expansion valve and an evaporator. The cold carrier system comprises a water pump. The cold carrier system and the refrigeration system share the evaporator to realize heat exchange between refrigerant and cold carrier. The application further comprises a heat exchange type liquid accumulator and a direct air cooling cooler. The refrigeration system and the cold carrier system share the heat exchange type liquid accumulator to realize heat exchange between refrigerant and cold carrier. The cold carrier system removes the heat of the cold carrier through the direct air cooling cooler. The application solves the problem that a part of air radiator is in idle state under two working modes of the refrigeration system.

Description

Technical Field

[0001] This invention relates to the field of refrigeration systems, specifically an air-cooled chilled water refrigeration system that enhances air cooling. Background Technology

[0002] A common type of air conditioner is the air-cooled chilled water air conditioner, which uses water or other liquids as the refrigerant. In order to continue cooling even when the outdoor ambient air temperature is significantly lower than the refrigerant temperature, a direct air cooler is often used, which directly cools the refrigerant using air cooling. Therefore, the system has two operating modes: direct air cooling and cooling mode where the refrigerant is cooled by a refrigeration cycle. In different modes, another part of the air-cooled fins is idle. That is, in the direct air cooling mode, the direct air cooler of the refrigeration system does not work and is in an idle state; similarly, in the cooling mode of the refrigeration system, the direct air cooler for the refrigerant is also in an idle state and cannot fully play the role of the heat exchanger. Summary of the Invention

[0003] This invention provides an enhanced air-cooled chilled water refrigeration system to solve the problem that in the two working modes of existing refrigeration systems, a portion of the air coolers are always in an idle state and not working.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A wind-cooled chilled water refrigeration system with enhanced air cooling includes a refrigeration system and a refrigerant transfer system. The refrigeration system includes a compressor, an air-cooled condenser, an expansion valve, and an evaporator. The evaporator has a refrigerant passage and a refrigerant transfer system, with the refrigerant passage of the evaporator connected to the refrigeration system. The refrigerant transfer system includes a water pump. The refrigerant transfer system and the refrigeration system share an evaporator. The outlet of the water pump is connected to the inlet of the refrigerant transfer system of the evaporator via a pipeline. A first refrigerant solenoid valve is connected between the water pump outlet and the refrigerant transfer system inlet of the evaporator. The outlet of the refrigerant transfer system of the evaporator is connected to a user load via a pipeline, thereby forming a refrigerant circulation loop. The system is characterized by further including a heat exchange type liquid receiver and a direct air-cooled cooler, wherein: The heat exchange type liquid receiver has a refrigerant channel and a secondary refrigerant channel. The refrigerant channel has a liquid phase inlet, a liquid phase outlet, and a gas phase outlet. In the refrigeration system, the compressor outlet is connected to the inlet of an air-cooled condenser via a pipeline. The outlet of the air-cooled condenser is connected to the liquid phase inlet of the refrigerant channel of the heat exchange type liquid receiver via a pipeline. The liquid phase outlet of the refrigerant channel of the heat exchange type liquid receiver is connected to the inlet of an expansion valve via a pipeline. The outlet of the expansion valve is connected to the refrigerant channel inlet of an evaporator via a pipeline. The refrigerant channel outlet of the evaporator is connected to the suction port of the compressor via a pipeline, thereby forming a refrigerant circulation loop. The gas phase outlet of the refrigerant channel in the heat exchange type liquid receiver is connected to the pipeline between the compressor outlet and the air-cooled condenser inlet via a bypass pipeline. In the cooling system, the outlet of the water pump is connected to the inlet of the refrigerant channel in the heat exchanger via a pipeline, and a second refrigerant solenoid valve is connected between the water pump outlet and the inlet of the refrigerant channel in the heat exchanger. The outlet of the refrigerant channel in the heat exchanger is connected to the inlet of the direct air-cooled cooler via a pipeline, and the outlet of the direct air-cooled cooler is connected to the pipeline between the heat exchanger and the user load via a bypass pipeline. The outlet of the direct air-cooled cooler is also connected to the inlet of the refrigerant channel in the heat exchanger via a pipeline.

[0005] Furthermore, the air-cooled condenser and the direct air-cooled cooler share the same fan.

[0006] Furthermore, each of the two outlet pipes of the direct air-cooled cooler is connected to a one-way valve.

[0007] Furthermore, the outlet pipe of the evaporator refrigerant channel is connected to a one-way valve.

[0008] In this invention, the heat exchange type liquid receiver is equipped with a refrigerant bypass pipeline. This refrigerant bypass pipeline is the pipeline between the outlet of the direct air-cooled cooler and the inlet of the refrigerant flow channel of the heat exchange type liquid receiver, so that the pipeline entering the heat exchange type liquid receiver is connected to the outlet pipeline of the direct air-cooled cooler. The bypass pipeline is equipped with a one-way valve to ensure that the refrigerant can only flow from the outlet pipeline of the direct air-cooled cooler to the refrigerant flow channel of the heat exchange type liquid receiver.

[0009] The refrigerant is divided into two paths at the water pump inlet. One path is equipped with a first refrigerant solenoid valve, and the other path is equipped with a second refrigerant solenoid valve. Both solenoid valves are normally closed, and only one can be opened during operation. Therefore, the refrigerant of this invention has two independent cooling modes: a refrigeration system cooling mode and a direct air-cooling mode. In both cooling methods, the refrigerant output from the compressor and the refrigerant transported by the water pump exchange heat with each other in a heat exchange receiver.

[0010] In the cooling method of the refrigerant refrigeration system, after the refrigerant enters the heat exchange type liquid receiver, it releases some heat to the refrigerant. After being heated, the refrigerant forms a bypass loop due to the decrease in density. After flowing through the direct fan cooler and the refrigerant bypass pipeline at the outlet of the direct fan cooler, it returns to the heat exchange type liquid receiver. This bypass loop enhances the heat exchange effect for further cooling of the refrigerant.

[0011] In the direct air-cooling method of the refrigerant, after the refrigerant enters the heat exchange type liquid receiver, it exchanges heat with the refrigerant there. The refrigerant that absorbs heat and vaporizes enters the air-cooled condenser of the refrigeration system through the gas phase outlet of the refrigerant flow channel of the heat exchange type liquid receiver. In the air-cooled condenser, it is cooled and condensed into liquid refrigerant, and then returns to the heat exchange type liquid receiver by gravity. The refrigerant is further cooled through this refrigerant bypass circulation, forming an enhanced heat exchange effect.

[0012] In both cooling modes of the air-cooled chilled water refrigeration system of the present invention, all air-cooled heat exchangers participate in the cooling operation, which improves heat dissipation efficiency and thus improves the energy efficiency ratio of the refrigeration system.

[0013] This invention employs a heat exchange type liquid receiver. In this heat exchange type liquid receiver, the refrigerant in the direct air-cooled cooler exchanges heat with the refrigerant in the refrigeration system. At the same time, the refrigerant or refrigerant after heat exchange is further cooled by air in its respective direct air-cooled cooler and air-cooled condenser, thereby enhancing heat exchange and making fuller use of the existing heat exchangers. This solves the problem that some air radiators are always idle in the two working modes of the refrigeration system.

[0014] Compared with the prior art, the advantages of the present invention are: 1. The heat exchange type liquid receiver is equipped with two bypass lines with one-way valves. One bypass line connects to the inlet of the air-cooled condenser and the vapor phase outlet of the refrigerant flow channel in the heat exchange type liquid receiver. The other bypass line connects to the outlet of the direct air-cooled cooler and the inlet of the refrigerant flow channel in the heat exchange type liquid receiver. This directly utilizes the natural flow circulation of the refrigeration system and the refrigerant flow channel, thereby improving the air-side heat exchange efficiency in both the direct air cooling mode and the refrigeration cooling mode, and improving the energy efficiency ratio of the refrigeration system.

[0015] 2. In this invention, the heat exchange type liquid receiver and the two bypass pipelines with one-way valves have a simple structure, require no electrical control system for control or manual operation, and have high reliability.

[0016] 3. The system structure is relatively simple. The added components are all mature refrigeration parts or parts with no production difficulty, which can be quickly put into practical use and play an energy-saving and efficient role. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1As shown, this embodiment discloses an enhanced air-cooled chilled water refrigeration system, including a refrigeration system, a cooling system, a heat exchange type liquid receiver 5, and a direct air-cooled cooler 13.

[0020] The heat exchange type liquid receiver 5 has a refrigerant flow channel for refrigerant and a refrigerant flow channel for secondary refrigerant. The refrigerant and secondary refrigerant form a heat exchange in the heat exchange type liquid receiver 5. The refrigerant flow channel has a liquid phase inlet 5a, a liquid phase outlet 5b and a gas phase outlet 5c. The secondary refrigerant flow channel has an inlet 5e and an outlet 5d.

[0021] The refrigeration system includes a compressor 1, an air-cooled condenser 3 equipped with a condenser fan 4, a refrigerant line solenoid valve 6, an expansion valve 7, and an evaporator 8. The evaporator 8 has a refrigerant passage for refrigerant and a refrigerant passage for secondary refrigerant, and the refrigerant and secondary refrigerant exchange heat within the evaporator 8. In the refrigeration system, the outlet of the compressor 1 is connected to the inlet of the air-cooled condenser 3 via a pipe equipped with a compressor discharge check valve 2. The outlet of the air-cooled condenser 3 is connected to the liquid phase inlet 5a of the refrigerant flow channel in the heat exchange type liquid receiver 5 via a pipe. The liquid phase outlet 5b of the heat exchange type liquid receiver is connected to the inlet of the refrigerant line solenoid valve 6 via a pipe. The outlet of the refrigerant line solenoid valve 6 is connected to the inlet of the expansion valve 7 via a pipe. The outlet of the expansion valve 7 is connected to the refrigerant passage inlet of the evaporator 8 via a pipe. The refrigerant passage outlet of the evaporator 8 is connected to the suction port of the compressor 1 via a pipe, thus forming a refrigerant circulation loop.

[0022] The vapor outlet 5c of the refrigerant flow channel in the heat exchange type liquid receiver 5 is connected to a bypass pipeline. This bypass pipeline is connected to the pipeline between the outlet of the compressor 1 and the inlet of the air-cooled condenser 3, and a solenoid valve 9 is connected in the bypass pipeline.

[0023] The cooling system includes a water pump 10. The cooling system and the refrigeration system share an evaporator 8. The outlet of the water pump 10 is connected to the inlet of the refrigerant channel of the evaporator 8 through a pipeline. A first refrigerant solenoid valve 11 is connected between the outlet of the water pump 10 and the inlet of the refrigerant channel of the evaporator 8. The outlet of the refrigerant channel of the evaporator 8 is connected to the user load through a pipeline, thereby forming a refrigerant circulation loop. A first refrigerant check valve 15 is connected between the evaporator 8 and the user load.

[0024] The direct air-cooled cooler 13 and the air-cooled condenser 3 are arranged side by side, and the direct air-cooled cooler 13 and the air-cooled condenser 3 share the condenser fan 4.

[0025] The outlet of water pump 10 is also connected to the inlet 5e of the refrigerant channel in heat exchanger 5 via a pipeline, and a second refrigerant solenoid valve 12 is connected between the outlet of water pump 10 and the inlet 5e of the refrigerant channel in heat exchanger 5. The outlet 5d of the refrigerant channel in heat exchanger 5 is connected to the inlet of direct air-cooled cooler 13 via a pipeline, and the outlet of direct air-cooled cooler 13 is connected to the pipeline between heat exchanger 8 and user load via a bypass pipeline, and a second refrigerant check valve 16 is connected to the pipeline between direct air-cooled cooler 13 and heat exchanger 8 and user load.

[0026] Meanwhile, the outlet of the direct air-cooled cooler 13 is also connected to a bypass pipeline, which is connected to the inlet 5e of the refrigerant flow channel in the heat exchange type liquid receiver 5, and a third refrigerant check valve 14 is connected in the bypass pipeline.

[0027] In this embodiment, the high-pressure, high-temperature refrigerant exhaust from compressor 1 enters the air-cooled condenser 3 through the compressor exhaust pipe check valve 2. Outdoor ambient air is drawn in by the condenser fan 4 and flows through the air-cooled condenser 3, cooling the high-pressure, high-temperature refrigerant into a high-pressure, low-temperature liquid refrigerant. This liquid refrigerant enters the heat exchange type liquid receiver 5 from the outlet of the air-cooled condenser 3, and then flows from the liquid outlet 5b at the bottom of the heat exchange type liquid receiver 5 through the refrigerant pipe solenoid valve 6 and expansion valve 7 to become a low-pressure gaseous refrigerant. It enters the evaporator 8 to exchange heat with the heat transfer fluid, absorbs the heat from the heat transfer fluid, and then vaporizes into a low-pressure gaseous refrigerant before returning to compressor 1, completing the basic refrigeration cycle. In this embodiment, there are two independent cooling modes: one is the refrigeration system cooling mode, in which the refrigeration system operates to provide cooling for the refrigerant; the other is the direct air cooling mode, in which the refrigeration system does not operate and the refrigerant is directly cooled by the direct air cooler 13.

[0028] The water pump 10 of the cooling system has two outlets. In the cooling mode of the refrigeration system, the refrigerant flows through the first refrigerant solenoid valve 11 and enters the evaporator 8 to release heat to the refrigerant of the refrigeration system. The temperature of the refrigerant decreases, and then it flows through the first refrigerant check valve and is delivered to the user to meet the user's cooling needs.

[0029] In another direct air-cooled mode, the refrigeration system is not running. The refrigerant flows through the second refrigerant solenoid valve 12 and enters the refrigerant inlet 5e of the heat exchange type liquid receiver 5. After exchanging heat with the refrigerant of the refrigeration system, it flows out from the refrigerant outlet 5d and enters the direct air-cooled cooler 13 to dissipate heat with the air again. Then, it flows out from the direct air-cooled cooler 13 and passes through the third refrigerant check valve 14 before being delivered to the user to meet the user's cooling needs.

[0030] In this embodiment, the refrigerant of the refrigeration system and the refrigerant of the cooling system exchange heat with each other not only through the evaporator 8, but also through the heat exchange type liquid receiver 5. This is specifically described in the refrigeration system cooling mode and the direct air-cooling mode, respectively: In the cooling mode of the refrigeration system, the refrigeration system operates. The high-pressure gaseous refrigerant is cooled into a high-pressure liquid refrigerant by the ambient air after passing through the air-cooled condenser 3. Then, it enters the heat exchanger 5 through the gas phase inlet 5a of the refrigerant flow channel. It exchanges heat with the refrigerant in the heat exchange tube inside the heat exchanger 5, transferring some heat to the refrigerant. As the refrigerant temperature rises, its density decreases, and it flows out from the refrigerant flow channel outlet 5d of the heat exchanger 5. It then enters the direct air-cooled cooler 13 along the pipeline and dissipates heat into the air. As the temperature decreases, its density increases, and it then returns to the heat exchanger 5 along the pipeline through the third refrigerant check valve 14, forming a small circulation of refrigerant flow, which enhances the heat exchange of the refrigerant.

[0031] In direct air-cooling mode, the refrigerant does not flow through the evaporator 8. Instead, the refrigerant flows through the heat exchange tubes inside the heat exchange receiver 5, transferring some heat to the liquid refrigerant inside the heat exchange receiver 5. This refrigerant becomes gaseous after being heated and flows out from the gas phase outlet 5c of the refrigerant flow channel in the heat exchange receiver 5. Then, it flows along the pipeline through the one-way valve 9 and enters the condenser 3, where it is cooled into a liquid state by the air flowing through the condenser. Under the action of gravity, this liquid refrigerant flows out along the outlet of the condenser 3 and flows along the pipeline into the gas phase inlet 5a of the refrigerant flow channel in the heat exchange receiver 5, where it continues to circulate in a small loop, increasing the heat exchange capacity of the refrigerant.

[0032] The present invention, through the above-described method, utilizes the heat exchange type liquid receiver 5 to enhance heat exchange on the air side in both the refrigeration system cooling mode and the direct air-cooling mode, thereby improving heat exchange efficiency.

[0033] This invention not only uses a heat exchange type liquid receiver as a heat exchanger between the refrigerant and the coolant, but also other types of heat exchangers used for the direct heat exchange between the refrigerant and the coolant at the condenser outlet can also be used to achieve enhanced heat exchange, and are equally protected by the rights of this invention.

[0034] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0035] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A wind-cooled chilled water refrigeration system with enhanced air cooling, comprising a refrigeration system and a refrigerant transfer system, wherein the refrigeration system includes a compressor, a wind-cooled condenser, an expansion valve, and an evaporator, the evaporator having a refrigerant passage and a refrigerant transfer system, the refrigerant passage of the evaporator being connected to the refrigeration system; the refrigerant transfer system includes a water pump, the refrigerant transfer system and the refrigeration system share an evaporator, the outlet of the water pump is connected to the inlet of the refrigerant transfer system of the evaporator via a pipeline, and a first refrigerant solenoid valve is connected between the water pump outlet and the refrigerant transfer system inlet of the evaporator, the outlet of the refrigerant transfer system of the evaporator is connected to a user load via a pipeline, thereby forming a refrigerant circulation loop, characterized in that... It also includes a heat exchange type liquid receiver and a direct air-cooled cooler, wherein: the heat exchange type liquid receiver has a refrigerant flow channel and a refrigerant flow channel, the refrigerant flow channel has a liquid phase inlet, a liquid phase outlet and a gas phase outlet, the compressor outlet in the refrigeration system is connected to the inlet of the air-cooled condenser through a pipeline, the outlet of the air-cooled condenser is connected to the liquid phase inlet of the refrigerant flow channel of the heat exchange type liquid receiver through a pipeline, the liquid phase outlet of the refrigerant flow channel of the heat exchange type liquid receiver is connected to the inlet of the expansion valve through a pipeline, the outlet of the expansion valve is connected to the refrigerant channel inlet of the evaporator through a pipeline, and the refrigerant channel outlet of the evaporator is connected to the suction port of the compressor through a pipeline, thereby forming a refrigerant circulation loop; In the heat exchange type liquid receiver, the gas phase outlet of the refrigerant channel is connected to the pipeline between the compressor outlet and the air-cooled condenser inlet via a bypass pipeline; in the cooling system, the outlet of the water pump is also connected to the inlet of the refrigerant channel in the heat exchange type liquid receiver via a pipeline, and a second refrigerant solenoid valve is connected to the pipeline between the water pump outlet and the refrigerant channel inlet in the heat exchange type liquid receiver; the outlet of the refrigerant channel in the heat exchange type liquid receiver is connected to the inlet of the direct air-cooled cooler via a pipeline, and the outlet of the direct air-cooled cooler is connected to the pipeline between the heat exchanger and the user load via a bypass pipeline, and the outlet of the direct air-cooled cooler is also connected to the inlet of the refrigerant channel in the heat exchange type liquid receiver via a pipeline; The air-cooled condenser and the direct air-cooled cooler share the same fan; The two outlet pipes of the direct air-cooled cooler are each connected to a one-way valve. The outlet pipe of the evaporator refrigerant channel is connected to a one-way valve.

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