A high-efficiency cooling and heating system based on the combined operation of heat source towers and ice storage

A technology for a heating system and a heat source tower, applied in the field of high-efficiency cooling and heating systems, can solve the problems of restricting the application of heat source tower heat pump systems, large equipment footprint, and low energy efficiency of heat pump units, so as to improve energy utilization and equipment. The effect of high utilization rate and lower operating costs

Active Publication Date: 2021-10-01
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the need to absorb heat from the air in the heat source tower through the solution in winter, the antifreeze is circulated in the tower, which greatly limits the application of the heat source tower heat pump system. At the same time, due to the different operating conditions of the heat pump unit in winter and summer, The operating conditions in winter are worse than in summer, so the heat pump system of the heat source tower is usually configured to take winter operation into consideration. The energy efficiency ratio of the heat pump unit in summer is lower than that of conventional chillers, essentially sacrificing part of the performance in summer to meet the normal operation in winter.
[0003] Ice storage technology makes full use of peak and valley electricity prices to save energy costs. However, ice storage requires a large area of ​​ice storage tanks for storage, and at the same time requires the use of refrigerant ethylene glycol to transport cold energy. The equipment occupies a large area and is high investment

Method used

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  • A high-efficiency cooling and heating system based on the combined operation of heat source towers and ice storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first valve A-1, the third valve A-3, the fifth valve A-4, the seventh valve A-7, the ninth valve A-8, the eleventh valve A-2 are closed, and the second valve B-1 , the fourth valve B-3, the sixth valve B-4, the eighth valve B-7, the tenth valve B-8, the twelfth valve B-2 open, the thirteenth valve AB-5 and the fourteenth valve AB-6 is open and the fifteenth valve C-1 is closed.

[0023] The user-side water pump enters the first condenser 4 in the main heat pump unit 1 through the thirteenth valve AB-5 and through the second valve B-1, the water temperature rises from 40°C to 45°C, and then passes through the fourth valve B-3 Enter the water distributor 8 to provide 45°C hot water to the user, and the cooled 40°C hot water returned from the user side enters the water collector 9 and then enters the inlet of the user water pump 12 to complete the hot water cycle; the medium temperature water at 25°C passes through the first The fourteenth valve AB-6 enters the mediu...

Embodiment 2

[0026] The second valve B-1, the fourth valve B-3, the sixth valve B-4, the eighth valve B-7, the tenth valve B-8, the twelfth valve B-2 are closed, the first valve A-1 , the third valve A-3, the fifth valve A-4, the seventh valve A-7, the ninth valve A-8, the eleventh valve A-2 open, the thirteenth valve AB-5 and the fourteenth valve AB-6 is open and the fifteenth valve C-1 is closed.

[0027] The cold water at 12°C enters the user water pump 12 from the water collector 9, and then enters the first evaporator 3 in the main heat pump unit 1 through the thirteenth valve AB-5 and the first valve A-1. After the temperature drops to 7°C, it passes through The third valve A-3 enters the water separator 8, and the temperature of the cold water in the water separator 8 rises to 12°C after absorbing heat from the room and flows back to the water collector 9 to complete the cold water cycle; the medium temperature water at 30°C passes through the fourteenth valve AB-6 flows into the m...

Embodiment 3

[0030] The ice water source heat pump unit 2, the ice water circulation pump 15, the medium temperature circulation pump 14, and the tower water pump 16 open the seventh valve A-7 and the ninth valve A-9, and close other equipment and valves.

[0031] The cooling water at 30°C enters the second condenser 5 in the ice water heat pump unit 2 through the medium-temperature circulating water pump 14, and flows back to the medium-temperature water tank 7 after the temperature rises to 35°C, and the hot water at 35°C passes through the seventh valve A-7 Enter the tower water pump 16, and then flow into the cooling tower to dissipate heat. After the temperature drops to 30°C, it enters the medium temperature water tank 7; the cold water at 0°C enters the second evaporator 6 in the ice water source heat pump unit 2 through the ice water circulation pump 15, and part of the water It solidifies into ice and falls into the ice water tank 11 under the action of gravity and the action of me...

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Abstract

The invention relates to an efficient cooling and heating system based on the combined operation of a heat source tower and ice storage. The high-efficiency cooling and heating system based on the combined operation of heat source towers and ice storage provided by the present invention can realize high-efficiency cooling in summer and high-efficiency heating in winter in southern regions where the outdoor temperature is high in winter, and make full use of peak and valley electricity prices; its main heat pump The unit is under the same pressure ratio in winter and summer, and the unit operates stably, with high energy efficiency and high equipment utilization; the main heat pump unit and the ice-making heat pump unit are used in series to perform secondary heating to ensure that the unit is always in a stable operating state , The system reliability is good; the ice-making heat pump unit produces ice-water mixture, and the water pump is directly used to transport the cooling capacity, which reduces the heat transfer process and improves energy utilization. In summer, it adopts high-efficiency unit cooling mode, ice-making mode, ice water cooling mode, etc. alone or in combination to reduce operating costs to the greatest extent and save energy to achieve high-efficiency cooling in extreme weather.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and air-conditioning system integration, and relates to a high-efficiency cooling and heating system, in particular to an efficient cooling and heating system based on the combined operation of a heat source tower and ice storage. Background technique [0002] In the current building refrigeration and air-conditioning system, the widely used cooling / heating 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. With its advantages, disadvantages and scope of application, the design and development of new and efficient cooling / heating systems is of great significance to building energy conservation. So a new type of heat pump system - heat source tower heat pump system came into being. The system operates in the cooling mode of the water-cooled chiller in summer, and in the heating mode of the heat pump in wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F5/00F24F13/30F24F11/89F24F11/84
CPCF24F5/001F24F5/0017F24F13/30F24F11/84F24F11/89Y02E60/14
Inventor 文先太曹先齐余鹏飞
Owner NANJING INST OF TECH
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