DEFROST CONTROL FOR HEAT PUMP.

摘要

A DEFROST CONTROL FOR A HEAT PUMP SYSTEM INITIATES A DEFROST WHEN CERTAIN COMPUTED CONDITIONS ARE EXCEEDED. THE CONDITIONS INCLUDE A LIMIT AS TO THE DIFFERENCE THAT MAY BE PERMITTED BETWEEN THE MAXIMUM TEMPERATURE DIFFERENCE OF TWO MEASURED TEMPERATURES AND THE CURRENT DIFFERENCE OF THESE MEASURED TEMPERATURES. THE TWO MEASURED TEMPERATURES ARE THE TEMPERATURE OF THE INDOOR COIL (10) OF THE COIL OF THE HEAT PUMP AND THE INDOOR AIR TEMPERATURE OF THE AIR BEING HEATED BY THE INDOOR COIL (10).(FIGURE 2)