harald
join:2010-10-22
Columbus, OH
kudos:1 | reply to pandora
Re: The addition saga continues well, I do claim to be an expert. I was the engineer who handled the reversing valve product for Ranco, who manufactured over 90% of the reversing vales in the world.
There is one loop in a heat pump, and all the refrigerant passes through it. There is no capability to prevent the refrigerant from passing through the inside coil. |
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pandoraPremium
join:2001-06-01
Outland
kudos:1 Reviews:
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| said by harald:well, I do claim to be an expert. I was the engineer who handled the reversing valve product for Ranco, who manufactured over 90% of the reversing vales in the world.
There is one loop in a heat pump, and all the refrigerant passes through it. There is no capability to prevent the refrigerant from passing through the inside coil.
Noting your past tense, and accepting your implicit assumption technology never changes, I'll defer to your expertise.
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"If you put the federal government in charge of the Sahara Desert, in 5 years there'd be a shortage of sand." - Milton Friedman" |
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redholm
join:2004-10-31
Sunnyvale, CA Reviews:
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| Pandora,
You have some nice heatpumps COP 1.22 at -10 Fahrenheit, very nice.
Your heatpump does not blow cold air during a defrost cycle and does not have heat strip in the indoor air handler. Both are good things and what is expected of a modern heat pump.
I personally hate electric heat strips in the indoor air handler, never the optimal solution IMHO.
Now where does the heat needed for the defrost come from? There are only two sources available, the compressor and the warm house. A good heatpump would use both because you want the defrost time to as short as possible. All the time you are in defrost mode the pump cannot heat your house which is the purpose of the heatpump in the first place.
Language like ‘The heat pumps do not use additional current when defrosting’ is not as clear as no heat strips in the indoor air handle. ‘No running of cold refrigerant the air handler’ sounds like marketing speak and is at best misleading, technically speaking it is incorrect. Much better to say not blowing cold air indoors during a defrost cycle.
Most people who have not seen a modern heatpump in action will be surprised how well they work in cold weather.
Laws of thermodynamics have not changed and defrost cycles still reverse the refrigerant flow and take heat from the house. |
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