科研之友
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摘要
A free cooling / vapor compression integrated air-conditioning system, which combines vapor compression refrigeration and a separate heat pipe, was proposed in this study. A first coolant and liquid-pump-driven second coolant are circulated throughout the system. The integrated system can operate on three modes: vapor compression refrigeration, dual refrigeration, and free cooling. In hot seasons, the refrigerating capacity is entirely provided by the vapor compression refrigeration unit, whereas in cold seasons, the refrigerating capacity is fully provided by the heat pipe unit. In transition seasons, the free cold source is used as much as possible by the heat pipe unit, and inadequate refrigeration capacity is supplemented by the vapor compression refrigeration unit. Moreover, a prototype of the HKF-200FH refrigeration unit is designed and tested. The compression and heat-pipe units are paralleled by a shell-tube type evaporative condenser whose tube side is used as an evaporator of the compression unit to supply refrigeration capacity to the shell-side second coolant when operating in compression refrigeration mode or dual refrigeration mode. The test results show that the refrigeration capacity of the integrated system changed little with an increasing energy efficiency ratio (EER) when the ambient temperature decreased. The refrigeration capacity in the compression refrigeration mode (ambient temperature is 35C) and heat-pipe mode (ambient temperature is 10 C) were 197. 38 and 196. 89 kW with EER of 3. 5 and 17. 26, respectively. Since May 2014, the prototype of the HKF-200FH has been safely and reliably operated at an EB-level cloud storage laboratory in Beijing. The long-term operation results have shown an energy-saving rate of 45% compared with traditional vapor-compression-type computer room air conditioners. ? 2019 Journal of Refrigeration Magazines Agency Co., Ltd.
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