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Heat exchange tower heat pump cooling and heating system and control method

A technology of heating system and heat exchange tower, applied in space heating and ventilation, heating mode, air conditioning system, etc., can solve the problems of screw machine cold and heat unable to meet the requirements, solution concentration control and other problems

Active Publication Date: 2021-06-11
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the occasions where the demand for cooling and heat is relatively large, the cooling and heat of the traditional screw machine cannot meet the requirements, and a high-efficiency centrifugal refrigeration unit with a large cooling capacity is usually used. However, for the centrifuge unit, it is limited by the pressure ratio and cannot It operates under relatively harsh working conditions, such as the occasion where the temperature on the condenser side is high and the temperature on the evaporator side is low. At the same time, there is a problem of solution concentration control in the winter operation of the open heat source tower heat pump system

Method used

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  • Heat exchange tower heat pump cooling and heating system and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the cooling mode, the chilled water at 12°C returns to the water collector 2 from the end of the user, and then flows into the inlet of the user water pump 33 . A-1 valve 21, A-2 valve 22, A-3 valve 23, A-4 valve 24, D-1 valve 61, D-2 valve 62, D-3 valve 63, D-4 valve 64 open, B -1 valve 41, B-2 valve 42, B-3 valve 43, B-4 valve 44, C-1 valve 51, C-2 valve 52, C-3 valve 53, the water in the water collector 2 enters the first In the first evaporator of a centrifugal heat pump unit and the second evaporator of the second centrifugal heat pump unit, after the temperature of the chilled water is reduced to 7°C, it enters the water separator 1 through the A-3 valve 23, and the temperature in the water separator 1 is 7°C The chilled water is supplied to users through pipelines, and the cooling water at 30°C flows out from the bottom of multiple heat exchange towers 4, and then passes through the tower water pump 9. After the cooling water is boosted, it passes through the ...

Embodiment 2

[0027] In the heating mode, the 40°C chilled water returns to the water collector 2 from the user end, and then flows into the inlet of the user water pump 33, and the -7°C antifreeze in the heat exchange tower 4 enters the second evaporator, B- 1 valve 41, B-2 valve 42, B-3 valve 43, B-4 valve 44, C-1 valve 51, C-2 valve 52, C-3 valve 53 open, A-1 valve 21, A-2 Valve 22, A-3 valve 23, A-4 valve 24, D-1 valve 61, D-2 valve 62, D-3 valve 63, D-4 valve 64 are closed, chilled water is boosted by user water pump 33 and then passed through B-1 valve 41, and then enter the second condenser of the second centrifugal heat pump unit. After the hot water temperature rises to 45°C, it enters the water separator 1 through the B-3 valve 43, and the heat of 45°C in the water separator 1 Water is supplied to users through pipelines, and at the same time, -7°C antifreeze flows out from the bottom of multiple heat exchange towers 4, and then flows into the tower water pump 9 inlet. After the a...

Embodiment 3

[0031] On the basis of Example 2, when the solution concentration detection device 8 detects that the solution concentration is lower than the set value, the outlet valve of the solution tank 7 is opened, the second solution pump 31 is opened, and the dilute solution at 20°C is pressurized and then passed through the check The valve flows into one of the heat exchange towers 4, the water in the solution evaporates into the air, the solution concentration increases, and then flows back into the solution tank 7.

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Abstract

On the occasion with high cold and heat demands of a heat source tower heat pump system for a central air conditioning system, and the cold and heat of a traditional screw machine cannot meet the requirements; an efficient centrifugal refrigerating unit with high cold capacity is generally selected, but for a centrifugal machine unit, the centrifugal machine unit is limited by the pressure ratio, and cannot operate under the severe working conditions, such as the occasion where the temperature of the condenser side is high, and the temperature of the evaporator side is low; meanwhile, when an open heat source tower heat pump system operates in winter, and has the problem of solution concentration control. According to the heat exchange tower heat pump cooling and heating system and the control method, two or more centrifugal heat pump units serve as the basis, and an energy tower, a tower water pump, a user water pump, a solution concentration detection system, a solution box, a solution pump, a water collector, a water segregator and the like are arranged. According to the system, through mode switching, efficient refrigeration can be achieved in summer, and efficient heating can be achieved in winter; and the solution concentration can be dynamically adjusted according to the requirements in winter, and efficient operation of the whole system in winter and summer is achieved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and air-conditioning system integration, and relates to a heat exchange tower heat pump cooling and heating system and a control method. Background technique [0002] With the rapid growth of China's economy, the importance of building energy conservation is gradually reflected. In the current urban building energy consumption, air-conditioning energy consumption accounts for the most important aspect, and some refrigeration and air-conditioning energy consumption accounts for 50% of the total building energy consumption. ~70%. [0003] In the current building refrigeration and air-conditioning system, the widely used cooling / warming methods are chiller + boiler (coal, gas or oil) and heat pump unit (air source heat pump, ground source heat pump and water source heat pump). Each thermal method has its advantages and disadvantages and scope of application. [0004] The air source heat pump ...

Claims

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Application Information

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IPC IPC(8): F25B13/00F25B49/00F24F5/00
CPCF25B13/00F25B49/00F24F5/0007
Inventor 文先太杨东方曹先齐余鹏飞张君
Owner NANJING INST OF TECH
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