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how is using a heat pump for, say, heating a house more efficient then just running the same amount of electric power straight trough an electric radiator?
So overall, an airconditioner powered by a Stirling engine will quickly grind to a halt (assuming it is initially started with a source of external power).
How to ordinary heat pumps don't grind to a halt?
It is not perpetual motion I am trying to suggest, don't get me wrong.
self sustaining and even have some spare energy left
I am not exactly sure if I understand you - you basically just said that an air conditioner (heat pump?) can generate 1 unit of heat energy requiring only .25 units of electric energy
Quote from: McKayHow to ordinary heat pumps don't grind to a halt? Ordinary heat pumps do grind to a halt within about a second of turning off the electrical power source (I have also seen some refrigerators that work by burning an organic fuel: getting cool by producing heat!).Quote from: McKayIt is not perpetual motion I am trying to suggest, don't get me wrong.Quote from: McKayself sustaining and even have some spare energy leftThis is the definition of a "perpetual motion machine of the first kind".
is the fluid of a heat pump, just after compression, hotter than it could be if the same amount of electric energy was put directly to heating that fluid?
Just to nuance myself after thinking this over for another 10 minutes: designing the right heat pump would not just be difficult, it would be impossible. It would be an impossible carnot cycle and violate the 2nd law of thermodynamics...Too bad.
For a heat pump system to extract energy from the environment you need both a source of heat and a source of cold that is why power stations spend a lot of money building cooling towers.
Quote from: syhprum on 28/02/2016 23:56:28For a heat pump system to extract energy from the environment you need both a source of heat and a source of cold that is why power stations spend a lot of money building cooling towers. Did you mean that for thermoelectric effect (or steam engine or something the likes) to work you need a temperature difference? Sure, of course.But a heat pump actually work the best when both source temp and target temp are the same (and it works to make one cooler and one hotter), doesnt it?*Input = 1 unit*Hot side = 3 units ->> generate anything >1 unit using thermoelectric/ piston/ whatever generator.*Cold side = -2 units ->> is replenished to 0 from environment. Sorry, I just cant let this thing go