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Anon questions the magic box
(sh.itjust.works)
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this post was submitted on 07 Jul 2024
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Heat pumps really are amazing tech. What if I tell you that this is also how your fridge works. Crazy, right?
They are also one of the few things that are more than 100% energy efficient.
300% to be exact. Because it uses some natural phenomena that just needs a little jump start and then can be maintained with little energy for massive air movement.
That efficiency metric doesn't really reflect what's going on. Of course moving stuff around is easier than heating it.
Some are as high as 510% efficient
The vapor compression cycle isn't exactly natural, and the compressor still needs a bunch of energy to keep going once it's started.
Yeah I’m pretty sure my air conditioner uses more electrical energy than all my other appliances combined. Probably by an order of magnitude. No EV in my case of course.
Yup. I'm hoping my AC and furnace die around the same time so I can just replace both with a heat pump. Not sure if it'll save much on heating prices since both nat gas and electricity are pretty cheap in my area, but it can hopefully make maintenance simpler.
A few years ago I replaced our electric furnace with a heat pump which also gave us AC. Overall the yearly bill went up because we now had AC, but winter months usage is almost half of what it was before. Only matching on the extra cold days where the backup heat kicks in.
Ah... energy doesn't work that way. You can't have a perpetually endless cycle with 100% efficiency in real world.
It's called a CoP, Coefficient of Performance. It essentially is a factor of how much electricity you put in and how much cooling power comes out.
Cooling towers can have a CoP of 12 and beyond, whereas compression cooling usually lingers at around 3 to 3.5. so at a CoP of 3 for instance, you could put in 1 kW of electricity and get 3 kW of cooling power.
Well it's not creating energy out of thin air. But it is moving it. So you get more energy moved than the amount of energy put in.
Sure but that's not the definition of efficiency, I'm sure it might be 5x more effective than traditional heaters of some sort from the power consumption perspective
so technically, it's not generating electricity, it's moving heat from point A to point B, and believe it or not, 20f air still has a lot more heat energy in it than 0k air. So yeah, it's more than 100% efficient. Comparing it to electric resistive heating, which is producing the heat directly from electricity, rather than moving it around.
An electric resistive heater is 100% efficient, the efficiency of gas furnaces is measured similarly, though they hit about 90% eff, due to basic mechanics. Geothermal systems would also have greater than 100% efficiency as well, due to the fact that they just move fluid around, which is then cooled by the earth, (or warmed by it) though external heating wouldn't be.
Why would they remove heat any differently, it’s the same concept cooling a fridge or freezer as a room. Am I too ignorant to understand why this is crazy because I want my mind blown.
How about saying that a normal air con unit, with a few extra valves, can heat as well as cool - in other words, if you've got Aircon, you've got a full heat pump, just without a pipe to do the heating bit. The energy you're spending cooling your house could also be heating your water... For free.
Or it can heat your house during colder months.
Yeah, exactly. If I had funds, I'd be switching to a heat pump.
Yup, just need to reverse the flow of the coolant. Or just... turn it around (don't actually do that, use a proper heat pump).