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Old 09-23-14, 03:26 AM   #21
F357
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How about this, where does the heat from the compressor motor end up going? I never thought about that before, but my 8000BTU unit uses around 800 watts. That's 2700 BTU! Is all (most) of that heat absorbed into the refrigerant?

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Old 09-23-14, 04:52 AM   #22
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In a split system heat pump it ends up in the indoor unit(evaporator in cooling mode) and aids the unit during heating. The more efficient your compressor you have the more efficient your heating will be. You'll end up with less heat resulting from COP 1 of the resistance coming from the motor windings. The indoor blower motor adds heat(granted COP 1) too. You might result with slightly less heat output(with all other things equal, which usually it won't be because the design will usually be to end up with a specific heat output) and a slightly longer run time but a higher coefficient of performance with more efficient compressors and blowers.

Last edited by MN Renovator; 09-23-14 at 01:46 PM.. Reason: Had a brain fart - Removed an incorrect and off topic section regarding cooling.
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Old 09-23-14, 12:15 PM   #23
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The heat always goes out the hot side.

Most of the electricity is converted into mechanical energy to spin the compressor scroll and move refrigerant. The waste heat is created from electrical and mechanical friction, as well as by the compression of the gas. Some of this heat escapes through the compressor shell, dependent on the inside vs. outside of the shell wall. Most of this heat travels to the condenser and is released with the heat of condensation.

The actual figures associated with my general description vary widely between units. Systems with larger outdoor heat exchangers generally have higher efficiency. With indoor heat exchangers, a larger surface area does not always correlate to higher efficiency. Indoors, it is more about target temperatures and airflow.


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