在一台住宅热泵上测试了三个两排热泵蒸发器（室外盘管），以确定翅片分级是否会减缓霜的生长，并改善热泵的结霜/除霜性能。基本线圈的均匀翅片密度为每英寸20个翅片。（每厘米8个鳍）在两排上。检查了两个翅片级线圈。第一个（案例一）在第一排和第二排上有15个fpi（6个翅片/厘米）和20个翅片/英寸的翅片间距。（8鳍/厘米）。第二个（案例二）的第一排和第二排的鳍间距分别为15 fpi（6鳍/cm）和25 fpi（10鳍/cm）。在35ºF（1.7ºC）和82%相对湿度条件下评估结霜/除霜性能。测量了第一排前缘的霜冻生长。 霜冻质量是通过蒸发器的湿度测量来估算的。还进行了稳态冷却和加热试验。与基本情况相比，情况一级线圈的霜/除霜COP提高了8%，而情况二级线圈的霜/除霜COP提高了4%。与基本情况相比，情况1线圈的霜冻/除霜周期延长了63%，而情况2线圈的霜冻/除霜周期延长了76%。两个分级盘管都延迟了蒸发器翅片前缘的结霜生长，尽管湿度测量表明除湿增加。这些趋势表明，分期成功地将霜冻生长转移到远离第一排前缘的位置。在三个盘管均处于标准稳定状态的情况下，对热泵进行了测试- 说明冷却和加热条件。三个盘管的制冷、制热能力和效率都相似。单位:双引文:阿什雷交易，第107卷，第。2.

Three two-row heat pump evaporators (outdoor coils) were tested on a residential heat pump to determine whether fin staging would slow frost growth and improve heat pump frosting/defrosting performance. The base coil had a uniform fin density of 20 fins per in. (8 fins per cm) on both rows. Two fin staged coils were examined. The first (Case One) had fin spacing on the first and second rows of 15 fpi (6 fins/cm) and 20 fins/in. (8 fins/cm), respectively.The second (Case Two) had fin spacing on the first and second rows of 15 fpi (6 fins/cm) and 25 fpi (10 fins/cm), respectively. Frosting/defrosting performance was evaluated at 35ºF (1.7ºC) and 82% RH. Frost growth on the leading edge of the first row was measured. Frost mass was estimated from psychrometric measurements across the evaporator. Steady state cooling and heating tests were also performed. The Case One staged coil improved frost/defrost COP 8% over the base case, while the Case Two coil improved 4%. The Case One coil had a 63% longer frost/defrost cycle time compared to the base case, while Case Two had a 76% longer cycle time. Both staged coils delayed frost growth on the leading edge of the evaporator fins even though psychrometric measurements indicated an increase in moisture removal. These trends suggested that staging was successful in moving frost growth to locations away from the leading edge of the first row. The heat pump was also tested with each of the three coils at standard steady-state cooling and heating conditions. Cooling and heating capacities and efficiencies were similar with all three coils.Units: Dual