Low-temperature heat recovery system

Abstract

The invention relates to the technical field of heat pump systems, in particular to a low-temperature heat recovery system. The low-temperature heat recovery system involves a compressor, a first four-way valve, a second four-way valve, an air side heat exchanger, an air conditioner water heat exchanger, a hot water heat exchanger, a liquid storage device, an economizer, a first throttling element, a second throttling element and a main flow pipeline, and the low-temperature heat recovery system comprises a refrigeration cycle mode, a heating cycle mode, a hot water cycle mode and a heat recovery cycle mode. According to the technical scheme, the four modes are supercooled through the economizer, on one hand, the exhaust temperature can be reduced, and the operation range is expanded; on the other hand, the supercooling degree of a main circuit is increased, therefore the system can normally operate in a low-temperature environment, and the system capacity and energy efficiency are improved; and only one liquid storage device is arranged, and a refrigerant does not pass through the liquid storage device in the refrigeration cycle mode, so that the supercooling degree loss of the system is favorably reduced, and meanwhile, the refrigerant injection amount is also reduced.

Description

Technical field [0001] The utility model relates to the technical field of heat pump systems, and more particularly to a low temperature heat recovery system. Background technique [0002] The heat pump is a highly efficient energy saving device that takes full advantage of low-grade thermal energy. The heat can be passed from the high temperature object to the low temperature object, but cannot be carried out in the opposite direction. The working principle of the heat pump is to force heat from the low temperature material to the mechanical device from the low temperature material to the high temperature object. It can also obtain a large amount of supply, which can effectively use the low product position that is difficult to apply. Thermal can use it to achieve energy saving purposes. [0003] Air conditioning heat pump technology uses the application of air conditioning and heating and hot water, which greatly enhances human life quality. For air conditioning and heating, th...

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Problems solved by technology

[0004] However, limited by the climate and environmental conditions, ordinary heat recovery air-cooled heat pump units can only operate at an ambient temperature above -15°C

For severe cold regions, due to the low temperature, the specific volume of the refrigerant will increase, which will lead to insufficient suction mass flow rate of the compressor, insufficient cooling of the motor, and high discharge temperature, which will endanger the safety of the unit and fail to operate normally.

The condensing temperature is related to the water temperature. For heating or hot water working conditions, the water temperature remains unchanged, the condensing temperature basically remains unchanged, and the evaporating temperature decreases due to the decrease of the ambient temperature. The lower the ambient temperature, the greater the compression ratio of the compressor, and the discharge temperature Higher, the unit cannot operate safely

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