| Experimental study on heat transfer characteristics of internal heat exchangers for CO2 system under cooling condition Young Chul Kwon
The Journal of Mechanical Science and Technology, vol. 23, no. 3, pp.698-706, 2009
Abstract : This paper presents the heat transfer characteristics of the internal heat exchanger (IHX) for CO2 heat pump system.
The influence on the IHX length, the mass flow rate, the shape of IHX, the operating condition, and the oil concentration
was investigated under a cooling condition. Four kinds of IHX with a coaxial type and a micro-channel type, a
mass flow meter, a pump, and a measurement system. With increasing of the IHX length, the capacity, the effectiveness,
and the pressure drop increased. For the mass flow rate, the capacity of micro-channel IHX are higher about 2
times than those of coaxial IHX. The pressure drop was larger at cold-side than at hot-side. In the transcritical CO2
cycle, system performance is very sensitive to the IHX design. Design parameters are closely related with the capacity
and the pressure drop of CO2 heat pump system. Along the operating condition, the performance of CO2 IHXs is different
remarkably. For oil concentration 1, 3, 5%, the capacity decreases and the pressure drop increased, as compared
with oil concentration 0%.
Keyword :
CO2; Internal heat exchanger(IHX); Transcritical cycle; Heat transfer; Pressure drop
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