NDLI: Experimental study on heat transfer characteristics of internal heat exchangers for CO$

Content Provider	Springer Nature Link
Author	Kwon, Young Chul Kim, Dae Hoon Lee, Jae Heon Choi, Jun Young Lee, Sang Jae
Copyright Year	2009
Abstract	This paper presents the heat transfer characteristics of the internal heat exchanger (IHX) for CO$_{2}$ 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 CO$_{2}$ cycle, system performance is very sensitive to the IHX design. Design parameters are closely related with the capacity and the pressure drop of CO$_{2}$ heat pump system. Along the operating condition, the performance of CO$_{2}$ IHXs is different remarkably. For oil concentration 1, 3, 5%, the capacity decreases and the pressure drop increased, as compared with oil concentration 0%.
Starting Page	698
Ending Page	706
Page Count	9
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	23
Issue Number	3
e-ISSN	19763824
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2009-06-28
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$ Internal heat exchanger(IHX) Transcritical cycle Heat transfer Pressure drop Industrial and Production Engineering Vibration, Dynamical Systems, Control Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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