本文研究了制冷系统蒸发器换热器除霜方法的性能。蒸发器的电除霜方法通常用于功率低于20 kW（5.7 TR）的相对较小系统，以及在-20°C（-4°F）及以下温度下运行的直接膨胀（DX）蒸发器。然而，在这一范围内的系统中很少使用热气除霜。本研究的项目设计包括特殊功能:两个蒸发器（DX和溢流式）、两个除霜循环（电循环和反向热气循环），以及通过过程逻辑控制器（PLC）进行控制和数据记录。 两个蒸发器都与一个公共冷凝器相连，以提供两个独立的回路。比较两种除霜方法在三种工作温度下的性能:-20℃、-10℃和0℃（-4℉、14℉和32℉），并进行分析，以确定此类系统的合适操作和可行性。引用:德克萨斯州达拉斯ASHRAE Transactions第119卷第1部分。

This paper investigates the performance of evaporator heat exchangers' defrosting methodology for refrigeration systems. The electric defrosting method for evaporators is often utilized for relatively small systems below 20 kW (5.7 TR) and with direct-expansion (DX) evaporators operating at - 20°C (-4°F) and below. However, the use of hot-gas defrosting is rarely seen for systems in this range. The project design for this study includes special feature: two evaporators (DX and flooded), two defrosting cycles (electrical and reverse hotgas), and control and data logging by a process logic controller (PLC). Both evaporators are linked to a common condenser to provide two separate circuits. The performances of the two defrosting methods are compared for three operating temperatures: -20°C, -10°C, and 0°C (-4°F, 14°F, and 32°F) and analyzed to ascertain suitable operation and viability for such systems.