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- W1567956251 abstract "Frost formation on cooling coils of supermarket display cases causes a reduction in operating efficiency of refrigeration equipment. In order to optimize the_ defrost cycle of such systems it is important to study and understand effects of frost formation. This paper presents air side heat transfer coefficient results for an air coil that is typically used in supermarket applications. Nomenclature Acoil = exterior surface area of coil [m] Ai =internal tube area [m] D::::: tube diameter [m] Lh = change in specific enthalpy [kJikg] LT1m =log mean temperature difference [K] hi= inside heat transfer coefficient [W/(m K)] ho =outside heat transfer coefficient [W/(m K)] Introduction heff = effective outside heat transfer coeff. k =thermal conductivity [W/(m K)] Nu0 = Nusselt number (h D/k) Pr = Prandtl number Q = heat transfer rate [W] Rw = thermal impedance of tube wall [KIW] U =overall heat transfer coeff. [W/(m K)] Increasing interest with respect to efficiency of modem HV AC&R equipment has led researchers to study and optimize different components of HV AC&R systems. Some of components that are constantly being studied and improved are heat exchangers in a vapor compression cycle. Frost formation on evaporator of a direct expansion vapor compression cycle causes a reduction in heat transfer capacity and reduces overall cycle efficiency. Further frost formation will cause cooling capacity to continue to decrease until system must be turned off and evaporator defrosted. Supermarkets face many cost related issues due to frost formation and subsequent defrosting of display case air coils. When vapor compression cycle is turned off and the defrost cycle is activated to melt ice on air coil, there is an increase in temperature of food products that are in display case. Depending on length of defrost cycle food temperature increase may exceed maximum 1 Graduate Research Assistant, Purdue University 2 Assistant Professor of Mechanical Engineering, Purdue University" @default.
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- W1567956251 date "1998-01-01" @default.
- W1567956251 modified "2023-09-27" @default.
- W1567956251 title "Effects of Frost Formation on the External Heat Transfer Coefficient of a Counter-Crossflow Display Case Air Coil" @default.
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