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首页> 美国政府科技报告 >Warm-Liquid Defrost for Commercial Food Display Cases: Experimental Investigation at 32.2 degree Condensing
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Warm-Liquid Defrost for Commercial Food Display Cases: Experimental Investigation at 32.2 degree Condensing

机译：商业食品展示柜的温液除霜：32.2度冷凝的实验研究

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The paper gives results of an experimental investigation at 32.2 C condensing of warm-liquid defrost for commercial food display cases. A refrigeration test rig with two open cases and two reach-in cases was tested using warm-liquid defrost (WLD) at -34.4 C evaporating, 32.2 C condensing, and 4.4 K subcooling below the condensing temperature. Results were compared to electric defrost (ED) at the same conditions. For all cases, WLD at 32.2 C condensing performed as well as ED (e.g, coils reached comparable temperatures at the end of defrost). For the open cases where defrost times were comparable, WLD causes a 1 K smaller rise in product temperature than is observed with ED. For the reach-in cases, defrost time for the WLD was 1 hour, compared to 35 minutes for ED. As a result of the longer defrost time, the product temperature was higher by 1.7 K with WLD than with ED. Increasing the flow rate of the liquid would shorten the defrost time and improved the product conditions.

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