Optimal design of a micro-orifice for constant evaporator superheat in a small cooler

Title
Optimal design of a micro-orifice for constant evaporator superheat in a small cooler
Author(s)
서태원진상록[진상록]성태종[성태종]김종원[김종원]
Keywords
SHORT TUBE ORIFICES; REFRIGERATION SYSTEM; 2-PHASE FLOW
Issue Date
201110
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
APPLIED THERMAL ENGINEERING, v.31, no.14-15, pp.2631 - 2635
Abstract
We present an optimal design for an orifice in a small cooler. The objective of the optimal design is to maintain constant superheat at the outlet of an evaporator while the flow rate and cooling load are changed. Four parameters are chosen for the optimal design: the diameter of the orifice, the aspect ratio between length and diameter, the entrance angle to the orifice, and the surface roughness. R-123 is used as the refrigerant. We perform a simulation to check the sensitivities of each parameter, and we determine the orifice diameter as the most sensitive design parameter among the four parameters to maintain the constant superheat. To find the optimal orifice diameter, experiments are performed on orifices of various diameters. To simulate the vapor-refrigeration cycle, the inlet condition of the orifice upstream flow is fixed at 3 bar and 60 degrees C. The superheat is measured at the outlet of the orifice while the cooling loads vary by 60, 80, and 100 Wand the flow rate varies by 20-70 mL/min. An orifice diameter of 350 mu m is selected as the optimal value to keep constant superheat at the evaporator outlet for various flow rates and cooling loads. The resulting optimal orifice design will be used in a small cooler. (C) 2011 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/24445http://dx.doi.org/10.1016/j.applthermaleng.2011.04.032
ISSN
1359-4311
Appears in Collections:
공과대학 > 기계공학부 > Articles
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