Xi'an Jiaotong University

Feng Cao

Mingjia Li

Xiang Yin

Jing Wang

Yulong Song

The present disclosures discloses a precooler-based transcritical COheat pump system and a control method of a waterway two-way valve thereof, in which a transcritical COheat pump system is assisted by a precooler system. A circulating waterway is divided into two parts in the system through a three-way diversion valve and a three-way confluence valve and is connected to a waterway bypass valve through a waterway two-way regulating valve. An ambient temperature sensor, an evaporation fin temperature sensor and an evaporation pressure sensor are provided, and a programmable logic controller is used as a core for acquisition, operation and control.

Precooler-based transcritical COheat pump system and control method of waterway two-way valve thereof

A control method of a transcritical carbon dioxide composite heat pump system is disclosed, wherein the transcritical carbon dioxide composite heat pump system includes: a COmain circuit compressor, an air-cooling-air-cooling recombiner, a supercooling-evaporation recombiner, an evaporator and a COauxiliary compressor; wherein the air-cooling-air-cooling recombiner comprises a COmain circuit, a COauxiliary circuit and a water circuit; the supercooling-evaporation recombiner comprises a COmain circuit supercooling section and a COauxiliary circuit evaporation section. The present invention includes two working modes according to the return water temperature, so that the unit has a wider application range and meets daily needs. There is only one heat exchanger for refrigerant and water. Compared with the three water and refrigerant heat exchangers in the conventional transcritical COcomposite heat pump, the circulating water circuit is a single circuit with one inlet and one outlet.

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Shaanxi, China

Feng Cao