3 ms·

Very impressive, i love this kind of stuff. “…and in my next video I’ll show you how to bake a pizza in your freezer.”

by shreddit 5y ago

nayuki 5y ago
Just swap a couple of pipes to reverse the heat pump. Nothing can possibly go wrong.
- spijdar 5y ago
  ...okay, but could this actually work? I'm assuming because there are no products like this that there's a giant caveat somewhere, but isn't it actually a good idea? My understanding is heat pumps can move more heat energy in/out of a system than the electrical energy input into them. My peabrain logic thinks, "Wait a moment, doesn't that mean a heatpump oven would be more energy efficient than a conventional electric oven with resistive heating?" I'm assuming the problem lies somewhere in refrigerants not, uh, behaving well at oven temperatures?
  - marcosdumay 5y ago
    You will be able to reach small ~100°C heating before everything starts failing and getting on fire, then you will get much larger temperatures, once. If you have a bad enough circuit breaker, you may even reach metallurgic oven temperatures for a short while! The refrigerant gas failing isn't actually a problem for high temperatures. They are a problem to getting too cold, but if you get hot enough, anything will work. Even if it burns down inside your pipes, the results will still work (but your pipes won't).
    - spijdar 5y ago
      Is the problem "literally using a freezer"? Could you (in principle) build an insulated chamber that could deal with the temperatures?
      - marcosdumay 5y ago
        Ok, the question is if you could build an oven heated by a heat pump? Yes, you could. You can reach home cooking temperatures reasonably easily, and probably even large ones. It's helpful that the compressor only has to deal with gases after they got cooled and heated again on the open air, all the really hot parts are rigid tubing. There will be problems turning the compressor off, dealing with the heat that propagates back through the pipes. You can solve them with some usual cooling devices (heat disipators, fans, etc).
- marcosdumay 5y ago
  It has a way to push heat into it, some heat insulation, a door, and it's food-ready. The thing is basically an oven already, and 270K and 400K are just some 30% change.

Very impressive, i love this kind of stuff. “…and in my next video I’ll show you how to bake a pizza in your freezer.”

nayuki 5y ago

Just swap a couple of pipes to reverse the heat pump. Nothing can possibly go wrong.

spijdar 5y ago
...okay, but could this actually work? I'm assuming because there are no products like this that there's a giant caveat somewhere, but isn't it actually a good idea? My understanding is heat pumps can move more heat energy in/out of a system than the electrical energy input into them. My peabrain logic thinks, "Wait a moment, doesn't that mean a heatpump oven would be more energy efficient than a conventional electric oven with resistive heating?" I'm assuming the problem lies somewhere in refrigerants not, uh, behaving well at oven temperatures?
- marcosdumay 5y ago
  You will be able to reach small ~100°C heating before everything starts failing and getting on fire, then you will get much larger temperatures, once. If you have a bad enough circuit breaker, you may even reach metallurgic oven temperatures for a short while! The refrigerant gas failing isn't actually a problem for high temperatures. They are a problem to getting too cold, but if you get hot enough, anything will work. Even if it burns down inside your pipes, the results will still work (but your pipes won't).
  - spijdar 5y ago
    Is the problem "literally using a freezer"? Could you (in principle) build an insulated chamber that could deal with the temperatures?
    - marcosdumay 5y ago
      Ok, the question is if you could build an oven heated by a heat pump? Yes, you could. You can reach home cooking temperatures reasonably easily, and probably even large ones. It's helpful that the compressor only has to deal with gases after they got cooled and heated again on the open air, all the really hot parts are rigid tubing. There will be problems turning the compressor off, dealing with the heat that propagates back through the pipes. You can solve them with some usual cooling devices (heat disipators, fans, etc).
marcosdumay 5y ago
It has a way to push heat into it, some heat insulation, a door, and it's food-ready. The thing is basically an oven already, and 270K and 400K are just some 30% change.