HKF-60FH

a compound refrigeration unit with heat pipe for data center and other electronic equipment has been researched and developed. It contains three work modes: vapor compressing refrigeration

compound refrigeration and refrigeration with heat pipe respectively. Two independent cooling loops are formed by four scroll compressors where two of them are parallel. In this way

this unit can regulate cooling capacity by changing volume of compressors. Heat pipe unit uses the second refrigerant

which is driven by a liquid pump. In the air-cooled side

a combined heat exchanger was used

which contains the heat exchanger of heat pipe unit

condenser of compressing refrigeration unit and fan. Vapor compressing refrigeration begins to work when the ambient temperature is high. In this work mode

the first refrigerant provides total cooling capacity for the second refrigerant by heat transfer in the evaporator-condenser. Compound refrigeration mode works in transition seasons under full load operation of the heat pipe unit and compression refrigeration unit remedies the cooling capacity. When the ambient temperature is low

heat pipe unit operates and makes full use of the natural cold source. HKF-60FH unit is applied to high performance computer system

the evaporators are established in the truss and its internal air-flow distribution uses the method of horizontal air supply and closed circulation. The recirculating air temperature of the evaporators is set to 33℃. According to the above parameters

the refrigeration capacity and COP of vapor compressing refrigeration mode can reach 61.3 kW and 3.23 W/W (the ambient temperature is 35 ℃). Furthermore

the capacity and COP of heat pipe mode achieve 59.8 kW and 11.3 W/W (the ambient temperature is 10 ℃).