|11-23-21, 07:30 AM||#1|
Join Date: Sep 2012
Location: England (stoke)
Thanked 2 Times in 2 Posts
defrosting a heat pump -are there any tricks?
i have a portable heat pump air conditioner which i am using to heat my house.
when its really cold it spends half the time switched off and defrosting.
i was wondering if the more expensive heat pumps have any advanced features for defrosting?
my heat pump just switches the compressor off to defrost and waits for the frost to melt.
do any heat pumps use water to defrost? or electric? or would that be heating the outdoors and poor efficiency?
|11-23-21, 12:42 PM||#2|
Join Date: May 2011
Location: Tortosa, Spain
Thanked 78 Times in 44 Posts
The normal method is a hot gas defrost. Basically the refrigerant flow is changed so hot liquid refrigerant flows to the condenser instead of cold liquid, this then defrosts the condenser in 'super quick time'. Normally it is a fixed time defrost that is run when a designated temperature is reached or exceeded for a set period of time.
The split type a/c units turn off the interior fan while defrost is active so the user doesn't suddenly get a blast of cold air.
On my own controller I monitor the temperature of the condenser so can cut short the defrost cycle if necessary.