PERFORMANCE ANALYSIS OF DOUBLE PIPE HELICAL SHAPED HEAT EXCHANGER FOR DIFFERENT ELLIPTICAL CROSS SECTION
Author(s):
Pravin Lakra , Vishwajeet Kureel
Keywords:
Double pipe heat exchanger, LMTD, NTU, CFD analysis
Abstract
The mechanism for improvement of the heat transfer performance in the passive method is by promoting turbulence near the tube wall surface to reduce the thermal boundary layer thickness. Another mechanism is based on intense fluid mixing by modified tubes such as finned tube, tube with rib, tube with spirally roughened wall, corrugated tube, fluted tube, helical tube, elliptical axis tube and micro-fin tube. Among the modified tubes, the different cross section tube has become important for heat transfer enhancement in turbulent single-phase flow as the pressure drop increment is reasonable. The water cooling/heating coil, commonly used as condenser or evaporator in water source heat pumps, is a double tube heat exchanger that employs a refrigerant on the annulus side and water on the tube side. The heat transfer enhancement on either side of the inner tube is the subject of the present study. For the present analysis the cross section of inner tube of a double tube heat exchanger has been changed considering the reduction of y axis and increment of x axis dimension of circular cross section. The aim of this study is “To access the effect of reduction of one axis and increment of other axis (changed from circular to elliptical shape) on the heat transfer performance of double pipe helical shaped heat exchanger with the help of finite element analysis.”
Article Details
Unique Paper ID: 151041

Publication Volume & Issue: Volume 7, Issue 11

Page(s): 653 - 658
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