Originally posted by dragon
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"FIG. 8 What if we don't use wire? If we simply place the second iron core near the first, then the lines of A-field flux will pass through both and link them together. The result? Nothing! No magnetic field appears in the second core, and the extra secondary does not produce any output voltage as it did in figure seven. WHY?!!! I don't know. I haven't thought deeply enough about this yet..."
but if the inside and outside were the same temperatures, then we have COP = 1. And of course this extreme example supposes that we use convection to move the air around. In reality, we have to expend energy to move the air and we have to do more than just open a window. This is because in reality, usually when we are trying to warm the inside, we need to raise it higher than the outside. That is where the heat pumps come in. The heat pump creates a one way path for the heat to flow - into the pump from the outside and then out of the pump to the room. And this takes more energy than just opening a window which is why realistically we have COP < 9 unless we use waste heat from some process where we can get COP around 30.
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