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Heat pumps are not an evaporative system. You can't lower the temperature across a gradient lower than the fluid temperature, no matter how fast that fluid is
by 16bytes 4y ago
Heat pumps are not an evaporative system.
You can't lower the temperature across a gradient lower than the fluid temperature, no matter how fast that fluid is moving. You can cool things down faster, but you can't go lower.
So if it's 10F, a 5F heat pump will work equally well at 0mph wind and 30mph.
- cmui 4y agoYou got it. A brief technical aside, heat pump performance is hurt by frosting, which happens at intermediate outdoor temps (~35-50F). Basically the outdoor coil is both below freezing, and below the dewpoint of the air. The frost forms a thermal insulating layer around the coil, and intermittently you have to run a defrost cycle to melt off the ice. This is a small hit to system efficiency.
- doctoboggan 4y agoYes, I never claimed they were. I was responding to the idea that only warm-blooded mammals have the concept of wind-chill. Any system that takes advantage of evaporative cooling will have the concept of wind chill. A "swamp cooler" is one example.