System for refrigerating and heat supply by utilizing district heating network and control method

Abstract

The invention discloses a system for refrigerating and heat supply by utilizing a district heating network and a control method. By utilizing a district heating network in an existing centralized heating system, a chiller is additionally arranged, and intermediate water in an appropriate temperature range was matched, so that concentrated refrigerating in summer and concentrated heating in winterare achieved. The district heating pipe network which is idle in a non-heating season is used as an intermediate water conveying channel, so that a new cold water pipe network is not needed building,and the maintenance cost of investment and equipment management is significantly reduced. Due to network multiplexing, the system is also capable of recovering waste heat from refrigeration to be usedfor urban domestic hot water. At the same time, the heating pipe network output by the system can transport the medium-temperature intermediate water, so that the temperature difference is increased;the conveying capacity and the conveying radius are improved; and the transportation energy consumption is reduced. On the one hand, the economy and efficiency of the whole system are improved, on the other hand, the system is advantageous for reducing the consumption of fossil fuels, pollutants and carbon emissions.

Description

technical field [0001] The invention relates to the field of urban heating, in particular to a system and control method for combined cooling and heating using a district heating network. Background technique [0002] With the continuous development of city scale and population growth, the operation of the city requires more energy consumption to meet the heating and cooling needs of residents. In order to effectively save energy and reduce environmental pollution, central heating and cooling is an important measure for sustainable development. [0003] For northern cities, the urban central heating system has been relatively mature after a long period of development, but the centralized cooling system is difficult to promote on a large scale due to various reasons. In addition, centralized refrigeration will also generate a large amount of waste heat, which will also aggravate the urban heat island effect. [0004] Taking Beijing as an example, with the development of the...

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Problems solved by technology

However, urban land is scarce, and it is very difficult to implement centralized refrigeration stations and cold water pipe networks. How to sustainably develop urban centralized refrigeration has become a problem facing the development of large cities

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