Heat Pump
A heat pump is the opposite of a heat engine. Rather than obtaining useful work as heat flows "downhill" from hot to cold, a heat pump uses work as an input in order to pump heat "uphill" from cold to hot.

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Joule-Thomson Effect

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Heat Engine

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Heat Pump Component Tour (In 3D)

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Anti-Heat Engines: Refrigerators, Air Conditioners, and Heat Pumps | Doc Physics

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What is a Heat Pump?

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Air To Air Vs Air To Water Heat Pumps: What's Better?

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Carnot Cycle

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The Science of Ductwork - Fundamentals of Airflow

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A Heat Engine Can Use Heat to do Work. But It Can't Be Perfectly Efficient! | Doc Physics

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The Genius of the World's Most Efficient Heat Pump

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How Do Refrigerators and Heat Pumps Work? | Thermodynamics | (Solved Examples)

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Psychrometrics Made Simple

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Heat and Work

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Heat Capacity

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Heat Pumps: the Future of Home Heating

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Hydronics System Components

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The Big Short (2015): The Jenga Scene – Explaining the Financial Collapse

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Enthalpy

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Physics 29 Efficiency Of Heat Engines (8 of 14) Efficiency of a Carnot Engine

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