Apparatus and method of operating a heat pump to improve heating

Details Apparatus and method of operating a heat pump to improve heating Apparatus and method of operating a heat pump to improve heating

1998-06-03

2000-10-17

Bennett, Henry

Refrigeration

Automatic control

Of external fluid or means

62181, 62183, 62186, F25D 1700

Patent

active

061314021

ABSTRACT:
An apparatus and method for a heat pump operating in the heating mode controls the condenser air flow rate and the condenser exiting air temperature depending in a first embodiment on the evaporator ambient temperature, and in a second embodiment, the evaporator air temperature and alternatively the condenser air flow rate or the condenser exiting air temperature, to alleviate a cold blow condition. The apparatus and method operate by sensing the evaporator ambient temperature with a sensor positioned proximate to the evaporator, and when that temperature is below a threshold value indicating a cold blow situation, determining by circuit means a modified condenser air flow rate to achieve at the same time a slower air flow and a higher air temperature, so that the cold blow condition is terminated or at least alleviated. The apparatus and method alternatively command the blower to achieve a determined condenser air flow, or to achieve a determined blower speed depending upon motor type, that results in a targeted condenser air flow or a targeted condenser exiting air temperature.

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