How Does a Heat Pump Work? (300% Efficient)

How does a Heat Pump Work? (300% Efficient) This machine puts out about three times more heat than the electricity you feed into it. Put in one unit of power, get three units of heat back. Sometimes four. That should be impossible. A resistive electric heater is 100% efficient — every joule of electricity becomes a joule of heat, and that is the absolute ceiling. A heat pump beats it by 300%, and it does that without breaking a single law of physics. By the end of this video you will know exactly where the extra energy comes from, and why "efficiency" was the wrong word all along. WHAT THIS VIDEO COVERS We start with the one you already own. Put your hand behind your fridge and the coils are warm — that is heat that used to be inside the box, now sitting in your kitchen. A heat pump is the same machine pointed the other way. Then we deal with the obvious objection: how do you pull heat out of freezing air? The answer is a kettle on Everest. Boiling point is not fixed, it moves with pressure, and every component in this machine exists to raise or lower it. The refrigerant inside boils at around minus 50°C, so on a winter morning that "freezing" outside air is scaldingly hot to it. From there we build the full loop, which is how does a heat pump work in physics terms rather than as a black box: — The outdoor coil where the refrigerant boils — The compressor, and why it is there to raise the boiling point, not to push fluid — The indoor coil where the gas condenses and releases the heat — The expansion valve, and why the refrigerant goes cold the instant pressure drops WHY THE 300% NUMBER IS HONEST Nothing is created here. The heat came from outside and was already in the atmosphere — the electricity buys transport, not heat. That is why engineers refuse to call it efficiency at all and use the coefficient of performance instead. A ratio between two different quantities is allowed to exceed one. How does a heat pump work in thermodynamics? The second law says heat will not flow from cold to hot on its own, and supplying work is exactly what buys the exception. WHAT THIS EXPLAINS IN PRACTICE Once you see that the number depends on the temperature gap, a lot of real-world behaviour makes sense at once. It explains how does a heat pump work in winter and why output drops on the coldest nights, exactly when you want it most. It explains why underfloor heating dramatically outperforms old radiators, and why a geothermal heat pump beats an air-source unit — a few metres down the ground stays near 10°C all year, so the lift in January is far smaller. It also explains the heat pump defrost cycle. If you have seen an outdoor unit steaming on a cold morning, or watched a heat pump freezing up in winter, that is not a fault. The coil runs colder than the air around it, ice forms, and the machine briefly runs itself backwards to melt it off. The same four components appear anywhere you look. A heat pump water heater, a heat pump dryer, and the air conditioning in a car are all this loop with the coils pointed somewhere else. Run it one way and you cool a box. Run it the other way and you heat a building. Lord Kelvin described this in 1852 and called it a heat multiplier. It took us the better part of two centuries to notice that heating a building by burning something throws away most of what you paid for. Subscribe for more physics and engineering explained from first principles. #HeatPump #Physics #Thermodynamics #Engineering #HowItWorks #Refrigeration #CoefficientOfPerformance #Geothermal