HEAT PUMP WITH IMPROVED PERFORMANCE IN HEATING MODE

摘要

A HEAT PUMP HAVING AN INDOOR COIL (13) THAT OPERATES AS A CONDENSER WHEN THE SYSTEM IS IN A HEATING MODE AND AN OUTDOOR COIL (12) THAT OPERATES AS AN EVAPORATOR WHEN THE SYSTEM IS IN THE HEATING MODE. A VARIABLE SPEED INDOOR FAN (23) IS USED TO MOVE SUPPLY AIR OVER THE INDOOR COIL (13) AND A TEMPERATURE SENSOR (29) IS ARRANGED TO PROVIDE AMBIENT OUTDOOR TEMPERATURE DATA TO A PROGRAMMABLE COMPUTER. THE COMPUTER CONTAINS A SCHEDULE FOR CONTINUOUSLY ADJUSTING THE SPEED OF THE INDOOR FAN (23) IN RESPONSE TO CHANGES IN THE AMBIENT TEMPERATURE SO AS TO MAINTAIN THE TEMPERATURE OF THE SUPPLY AIR AT A CONSTANT LEVEL. IN DOING SO, THE COMPRESSOR DISCHARGE PRESSURE IS ALSO MAINTAINED WITHIN ALLOWABLE LIMITS AND IS HELD SUBSTANTIALLY CONSTANT.(FIG 1)