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• W86258498 abstract "In this study, the air-side heat transfer coefficients of several types of heat exchangers used as the evaporators in the household freezer/refrigerators are investigated. The types considered in this work are: spine finned tube type(in-lined tube array), continuous flat-plate fin-tube type(staggered tube array), and discrete flat-plate fin-tube type(in-lined tube array). The computer programs were coded using the section-by-section method similar to the tube-by-tube method to calculate the heat transfer coefficients from the experimental results of the heat exchangers. The input data for these programs are the flow rate and inlet temperature of air, the flow rate and inlet temperature of brine, and the heat transfer rate obtained from the experiment. The heat transfer coefficient of each experiment can be found by comparing the calculated heat transfer rate with the experimental heat transfer rate iteratively. The heat transfer correlations for each heat exchanger were driven from the calculated heat transfer coefficients using the least square method, and the error between the correlations and the calculated heat transfer coefficients were less than 5%. The result indicates that the air-side heat transfer performance of spine finned-tube type(in-lined tube array) heat exchangers shows the highest value among these three heat exchangers at dry condition. NOMENCLATURE A : Heat transfer area NTU : Number of transfer unit Ac : Cross sectional area P : Perimeter C : Heat capacity ratio Q : Heat transfer rate cp : Isobaric specific heat R : Thermal resistance D : Diameter T : Temperature h : Heat transfer coefficient U: Overall heat transfer coefficient k : Thermal conductivity V : Air velocity L : Length . m : Mass flow rate GREEK SYMBOLS e : Effectiveness η : Efficiency SUBSCRIPTS 1 : Heat exchanger # 1 app : Approaching velocity 2 : Heat exchanger # 2 cor : Value by correlation 3 : Heat exchanger # 3 exp : Experimental results a : Air-side F : Fin area i : Inlet T : Total area max : Maximum velocity t : Tube area o : Outlet w : Water-side INTRODUCTION World-widely, about 80 million sets of household freezer/refrigerators are produced every year. About 40% of these household freezer/refrigerators adopt indirect cooling type using finned-tube type evaporator with a fan. Several types of finned-tube heat exchangers are used as an evaporator, and Table 1 illustrates the usage with photographs. The table shows that many companies use discrete flat plate finned tube type heat exchanger with inlined tube array(heat exchanger #1), continuous flat plate finned tube type heat exchanger with staggered tube array(heat exchanger #2) or spine finned tube type heat exchanger(heat exchanger #3). Unfortunately, there exists only limited data about these heat exchangers, especially about on comparison of thermal performances. The aim of this study is to compare the air-side heat transfer coefficients of the above-mentioned three types of heat exchangers. Experiments were conducted to evaluate the heat transfer performance of each heat exchanger. The heat transfer coefficients were numerically calculated by utilizing the experimental data and analysis program. The program used in this study is based on section-by-section method, a similar scheme with Domanski’s tube-by-tube method[1]. Table 1. Heat exchangers used in a domestic freezer/refrigerator Heat exchanger No. Type Photo Company 1 Discrete Flat plate-finned Tube LG Samsung Matsushita Fujitsu Westing House BPL Frigidaire 2 Continuous Flat plate-finned Tube Whirlpool MayTag Liebherr Amana 3 Spine finned Tube GE Table 2 Geometric parameters of the test heat exchangers Heat exchanger No. 1 2 3 Fin type Discrete flat plate Continuous flat plate Spine Tube array In-lined Staggered In-lined Number of tube rows 7 10 5 Number of tube steps 2 ← ← Tube outer diameter(Do) 8.5mm 7.9mm 9.4mm" @default.
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• W86258498 date "2002-01-01" @default.
• W86258498 modified "2023-09-27" @default.
• W86258498 title "Comparison Of Air-Side Heat Transfer Coefficients Of Several Types of Evaporators Of Household Freezer/Refrigerators" @default.
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