Designing and Researching of Gas Cooler in Trans-Critical Carbon Dioxide Water Heater
In this paper a gas cooler for trans-critical carbon dioxide water heater was designed and calculated according to the theory basis for the optimal design. The characteristic parameters of gas cooler in heat pump hot water system were compared and analyzed, applying the data from trans-critical carbon dioxide water heater test bed, under one-time heating condition, by different flow of chilled water and hot water, different inlet temperatures of chilled water and hot water. To sum up, coefficient of performance can be increased by increasing the chilled water inlet temperature or hot water circulating flow, while it can be decreased by increasing the inlet temperature of hot water circulating system，the parameters (flow of water, inlet temperature, the refrigerant mass flow, gas cooler pressure and inlet temperature of refrigerant) need to be adjusted to different requirements, for ensuring the high efficiency of system.
Zhihua Xu, Gang Shen and Sally Lin
J. Lv and J. Yang, "Designing and Researching of Gas Cooler in Trans-Critical Carbon Dioxide Water Heater", Advanced Materials Research, Vols. 171-172, pp. 368-373, 2011