Wide-environment-temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery

Abstract

The invention provides a wide-environment-temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery. The system comprises a low-pressure-section CO2 compressor, a high-pressure-section exhaust electronic three-way valve, a high-pressure-section CO2 compressor, a heat recovery plate heat exchanger, a regenerative circulation plate heat exchanger, a high-pressure electronic pressure regulating valve, an evaporator, a gas-liquid separator, a steam separation electronic pressure regulating valve and a low-pressure-section suction electronic three-way valve. The heatrecovery plate heat exchanger adopts a six-interface form; meanwhile, low-pressure section exhaust heat and high-pressure section exhaust heat are recycled; the maximum recycling of a heat source is realized; the outdoor temperature change process is subjected to data acquisition through the controller; a controller program can achieve switching of heating circulation by controlling the electronicthree-way valve, it is guaranteed that the system achieves the two-stage compression process under the condition of low environment temperature and achieves the one-stage compression process under the condition of high environment temperature through switching, safe and reliable operation of the system can be guaranteed, and meanwhile high efficiency of system operation is guaranteed.

Description

technical field [0001] The invention relates to the technical field of heat pump systems, in particular to a wide-circumstance temperature CO2 air source heat pump system for high-pressure exhaust heat recovery. Background technique [0002] With the improvement of the country's environmental protection requirements, the winter heating equipment has changed from the traditional coal-fired heat pump system to the electric heat pump system. The heat pump system needs to use the refrigerant working medium, and the natural refrigerant CO2 is favored in the new heat pump system because of its excellent environmental protection characteristics (ODP=0, GWP=1) and excellent heating capacity. The latitude of our country has a large span from north to south, and the ambient temperature in the northern region will be as low as -40°C in winter. The temperature span is very large, and ordinary heat pump systems are difficult to adapt to the use of low ambient temperature in the north. ...

AI Technical Summary

Problems solved by technology

The north-south latitude of our country is very large, and the ambient temperature in the northern region will be as low as -40°C in winter. The temperature span is very large, and ordinary heat pump systems are difficult to adapt to the use of low ambient temperature in the north.

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