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... rgy, generating heat with 1 kW·h of electricity cannot possibly exceed 1 kW·h, but if ground-source heat pump technology is used, it can bring about 4 kW·h of heat or cold with 1 kW·h of electricity.

At first glance, this seems almost magical, like some pseudoscience trickery, but in fact, this is a tangible technology, and devices that achieve this level of efficiency are ubiquitous in our lives, with air conditioners being the most representative.

In thermodynamics, the ratio o ...

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