Talk:2790: Heat Pump

woah! an xkcd with color what was the last one with color? (im kinda new to xkcd) 172.71.122.48 21:17, 16 June 2023 (UTC)Erfaniom

I suppose color was needed to show the air temperature. Odd, though, that in summer (in the northern hemisphere), the character is trying to increase the indoor temperature. Davidhbrown (talk) 21:27, 16 June 2023 (UTC)

He's not. He's moving the hot air from inside to the cooler outside. Barmar (talk) 22:18, 16 June 2023 (UTC)

I actully think he's warming the inside, already warmer than outside, by effectively (and literally!) squeezing the heat out of the cooler outdoors air.

By compressing the cool outdoor air, he increases its temperature (p1v1/t1=p2v2/t2) to warmer than the warm indoor air, creating a squeezebox->room flow of heat energy, then returns to the outside before decompressing and lowering the temperature in his squeezebox below the cool-air temperature in order to create an outdoors->squeezebox flow of energy and repeat. (The comic has the cycle start at roughly half-way through that, and wraps round, but the heat-to-room seemed the most obvious starting place here.)

Right now, I'd not wish to heat my indoors up (even at 11:30pm, like now), so I agree that it's a funny time of year show heat-adding (rather than heat removing), but it definitely is that. 172.70.86.154 22:31, 16 June 2023 (UTC)