The core of the heat pump is a loop of refrigerant pumped through a vapor-compression refrigeration cycle that moves heat.
12.
By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa.
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That is, all the processes that comprise it can be reversed, in which case it becomes the Carnot refrigeration cycle.
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In 1805, American inventor Oliver Evans described a closed vapor-compression refrigeration cycle for the production of ice by ether under vacuum.
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The process is reversed in the winter by extracting heat from outside air through a refrigeration cycle and bringing it inside.
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Check out Refrigeration cycle and Carnot heat engine and if you're still in doubt studying this should give you a definitive answer:
17.
Therefore, for the same cooling load, gas refrigeration cycle machines require a larger mass flow rate, which in turn increases their size.
18.
A vapor-compression refrigeration cycle, for example, follows a sequence where the refrigerant fluid transitions between the liquid and vapor states of matter.
19.
The most common types of refrigeration systems use the reverse-Rankine vapor-compression refrigeration cycle, although absorption heat pumps are used in a minority of applications.
20.
Using a vapor-compression refrigeration cycle, the system heats district water from 65 �C to 90 �C for use in building heating and hot water systems.
