本文介绍了家用热泵微机控制按需除霜系统。该系统在加热操作期间检测室内盘管的进气和排气之间的温差，并存储该温差的最大值。当室外盘管上的结霜将温差降低到检测到的温差与最大值之比等于预设值时，开始除霜。在实验室和现场试验中研究了新系统的节能效果。结果表明，新系统减少了不必要的除霜，并以最大化热量的方式进行控制，提高了能耗- 在日本的正常气候条件下，与传统的时温除霜系统相比，可节省约5%的成本。单位:SICitation:研讨会，ASHRAE交易，1985年，第91卷，pt。你好，檀香山2B

This paper describes the microcomputer-controlled demand defrost system for residential heat pumps. This system detects the temperature difference between the inlet air and the outlet air of the indoor coil during the heating operation and memorizes the maximum value of this temperature difference. When frosting on the outdoor coil decreases the temperature difference to a point at which the ratio of the detected temperature difference to the maximum value becomes equal to a preset value, defrosting is initiated. The effect of energy saving in the new system has been studied in both laboratory and field tests. The results indicate that the new system reduces unnecessary defrosting, is controlled in such way that the extracted heat is maximized, and improves the energy-saving factor by about 5% over the conventional time-temperature defrost system under the normal climatic conditions in Japan.Units: SI