Combined type large-temperature-difference cold supply system and control method thereof

A large temperature difference, compound technology, used in air conditioning systems, heating methods, household heating and other directions, can solve the problem of small temperature difference between supply and return water, large temperature difference and the energy saving and cost saving advantages of cold storage technology have not been fully exerted, cold storage device cold storage density It can not be improved and other problems, so as to achieve the effect of increasing the density of cold storage, broadening the temperature limit, reducing the initial investment of equipment and operating costs

Pending Publication Date: 2019-08-27
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The temperature difference between the supply and return water of the existing air-conditioning system with large temperature difference is still small. Due to the structural design of the surface cooler at the end of the existing air conditioner and the operation mode of the terminal, the further increase in the temperature difference between the chilled water supply and return is limited, and the cold storage density of the cold storage device cannot be obtained. The energy-saving and cost-saving advantages of large temperature difference and cold storage technology have not been fully utilized

Method used

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  • Combined type large-temperature-difference cold supply system and control method thereof
  • Combined type large-temperature-difference cold supply system and control method thereof
  • Combined type large-temperature-difference cold supply system and control method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, in the combined cooling mode: turn on the cooling water pump 14, the first fan 2, the compressor 8, the throttling device 10, the second fan 12, the first valve 4 and the third valve 6, and close the second valve 5 and the fourth valve 7; the low-temperature cold water stored in the cold storage device 15 enters the first heat exchange module 3 to exchange heat with the air in the first wind cabinet 1 to form medium-temperature cold water, and the cooled air is sent to the user end by the first fan 2, The formed medium-temperature cold water enters the condenser 9 and exchanges heat with the high-temperature and high-pressure refrigerant gas from the compressor 8 to form high-temperature cold water. The refrigerant gas-liquid mixture enters the second heat exchange module 13 and the air in the second wind cabinet 11 performs heat exchange and evaporation to form a low-pressure refrigerant gas and returns to the compressor 8, and the cooled air...

Embodiment 2

[0049] Such as figure 1 As shown, in the independent cooling mode of the first wind cabinet: turn on the cooling water pump 14, the first fan 2, the first valve 4 and the fourth valve 7, turn off the compressor 8, the throttling device 10, the second fan 12, The second valve 5 and the third valve 6; the low-temperature cold water stored in the cold storage device 15 enters the first heat exchange module 3 to exchange heat with the air in the first wind cabinet 1 to form medium-temperature cold water, and the cooled air is sent by the first fan 2 To the user end, the formed medium-temperature cold water returns to the cold storage device 15 for use.

Embodiment 3

[0051] Such as figure 1 As shown, in the independent cooling mode of the second wind cabinet: turn on the cooling water pump 14, the compressor 8, the throttling device 10, the second fan 12, the second valve 5 and the third valve 6, and turn off the first fan 2, The first valve 4 and the fourth valve 7; the medium-temperature cold water stored in the cold storage device 15 in the independent cooling mode of the first wind cabinet is transported to the condenser 9 through the cooling water pump 14, and the high-temperature and high-pressure refrigerant gas from the compressor 8 Perform heat exchange to form high-temperature cold water, high-temperature and high-pressure refrigerant gas condenses into high-temperature and high-pressure refrigerant liquid, throttling and reducing pressure through the throttling device 10 to form a low-pressure refrigerant gas-liquid mixture, and enters the second heat exchange module 13 and the second wind cabinet 11 The air is heat-exchanged an...

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Abstract

The invention discloses a combined type large-temperature-difference cold supply system. The system comprises a cold accumulation unit, a first air cabinet unit, a composite refrigeration unit and a second air cabinet unit, wherein the first air cabinet unit comprises a first air cabinet, a first fan and a first heat exchange module, the composite refrigeration unit comprises a compressor, a condenser, a throttling device and a second heat exchange module, the second air cabinet unit comprises a second air cabinet, a second fan and the second heat exchange module, and the cold accumulation unit comprises a cold water discharging pump and a cold accumulation device; and the invention further discloses a control method of the combined type large-temperature-difference cold supply system. According to the system and the method, the first-stage large temperature difference utilization of the low-temperature cold water is realized through the first heat exchange module, the second-stage large temperature difference utilization of the cold water is realized through the composite refrigeration unit, the gradient utilization of the low-temperature cold water of the cold accumulation deviceis finally realized, and the temperature limit range of cold accumulation is widened, the cold accumulation density of the cold accumulation device is greatly improved, and the initial investment andoperation cost of equipment of the cold supply system are reduced.

Description

technical field [0001] The invention relates to air-conditioning refrigeration technology, in particular to a compound cooling system with large temperature difference and a control method thereof. Background technique [0002] In a conventional air conditioning system, the chilled water supply temperature is 7°C, and the temperature difference between supply and return water is 5°C. The water supply temperature of the large temperature difference air conditioning system is usually 5-7°C, and the temperature difference between the supply and return water is 6-8°C. The large temperature difference air conditioning system has the advantages of low energy consumption for chilled water transportation and low pipeline construction costs. The combination of large temperature difference air conditioning system and cold storage system can reduce the energy consumption of chilled water transportation and pipeline construction costs on the one hand, and increase the cold storage densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F5/00F24F11/65F24F11/84F24F11/85F24F13/30
CPCF24F5/001F24F5/0017F24F11/65F24F11/84F24F11/85F24F13/30Y02E60/14
Inventor 董凯军邵振华苏林
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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