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SufferingIdiots t1_j1a1nrq wrote

Reply to comment by Bunslow in Why do we use phase change refrigerants? by samskiter

This be will dependent on the temperature differential, the refrigerant and your specific equipment.

>At 8°C, the coefficient of performance (COP) of air-source heat pumps typically ranges from between 2.0 and 5.4. This means that, for units with a COP of 5, 5 kilowatt hours (kWh) of heat are transferred for every kWh of electricity supplied to the heat pump. As the outdoor air temperature drops, COPs are lower, as the heat pump must work across a greater temperature difference between the indoor and outdoor space. At –8°C, COPs can range from 1.1 to 3.7

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Bunslow t1_j1ajws0 wrote

hmm, so if it's -10C or -20C outside, and inside i want it at the usual 21 or 22C, then my cop might drop as low as 2? for residential purposes

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bluesam3 t1_j1b6s2k wrote

It will vary between models and setups, but yes, that seems like a reasonable number to expect, broadly speaking.

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