Special heat pump unit for sewage source and system thereof

Abstract

The invention relates to a special heat pump unit for a sewage source and a system thereof, wherein the special heat pump unit utilizes urban untreated sewage as a cold and hot source for carrying out heating and air conditioning on a building, and comprises a compressor (1), an oil separator (2), a condenser (3), an electronic expansion valve (4), an evaporator (5), an economizer (6), a piston type untreated sewage filter device (7), a change-over valve 1 (8), a change-over valve 2 (9), a throttle valve (30), a regulating valve (31) and the like.

Description

technical field [0001] The invention relates to a sewage source special heat pump unit and its system for heating and air-conditioning buildings by using urban primary sewage as a cold and heat source. Background technique [0002] The use of urban raw sewage as a low-level cold and heat source for heat pumps has important energy-saving and environmental protection values ​​for heating and air conditioning of buildings. It is one of the effective ways to alleviate energy consumption and reduce environmental pollution. However, raw sewage contains a lot of impurities , if it goes directly into the heat pump unit for heat exchange without any treatment, its evaporator or condenser is easily blocked, and the unit cannot operate normally. [0003] In addition, urban raw sewage contains a lot of hair, fiber, sediment and other substances, which are often smaller than the diameter of the filter mesh. After the system has been running for a long time, there will be more hair and fi...

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Problems solved by technology

[0004] If the intermediate heat exchange equipment is used, that is, the sewage and the intermediate water exchange heat (the intermediate water uses system softened water), and the intermediate water enters the heat pump unit for heat exchange. Due to the addition of a heat exchange system, the intermediate water and the original sewage The temperature after heat exchange is about 5°C higher than that of raw sewage, and the temperature after heat exchange between intermediate water and raw sewage in winter is about 5°C lower than that of raw sewage. Compared with raw sewage directly entering the heat pump unit for heat exchange, the heat pump The efficiency of the unit is relatively low. In addition, the intermediate water and sewage conduct heat exchange, which increases the intermediate water circulation pump and intermediate heat exchange equipment, which also increases the initial investment and operating costs of the entire heat pump system, and the machine room occupies a large area.

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