Does Pressure Affect Heat Absorption and Release in Heat Pumps?

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SUMMARY

The discussion centers on the relationship between pressure and heat absorption/release in heat pumps, specifically regarding refrigerants during phase changes. It is established that the heat absorbed by a refrigerant at low pressure is not equal to the heat released at high pressure due to variations in latent heat. The amount of heat required for phase change and condensation does depend on pressure, particularly for substances with significant volume changes. Overall, while pressure affects latent heat, its impact is minimal in many cases.

PREREQUISITES
  • Understanding of heat pump operation and refrigerant phase changes
  • Knowledge of latent heat and its role in thermodynamics
  • Familiarity with pressure effects on thermodynamic properties
  • Basic principles of heat transfer and thermodynamic cycles
NEXT STEPS
  • Research the impact of pressure on latent heat in refrigerants
  • Learn about the thermodynamic cycles of heat pumps
  • Explore the concept of enthalpy and its relation to phase changes
  • Investigate specific refrigerants and their performance under varying pressures
USEFUL FOR

Engineers, HVAC professionals, and students studying thermodynamics or heat pump technology will benefit from this discussion.

firecool
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let's say some amount of heat is absorbed by a refrigerant for phase change at a low pressure. will this heat absorbed be equal to the heat given out by the compressed refrigerant at high pressure?
i know that the amount of heat required for phase change from liquid to vapour is less at low pressure.
similarly does the amount of heat required for condensation depend on how much pressure is being applied?
as far as i understand the heat pump functions using the latent heat(of phase change) property of the refrigerant to absorb and reject more heat at small temperature differences. so that more heat flows as the temperature doesn't change during the phase change. am i right?
and please answer the above two questions too. :) and in layman's terms.. :P
 
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it's about the same. latent heat is a molecular matter, and pressure has an effect but very small in most cases.

latent enthlapy, however, depends on pressure yes. For substances where the volume changes significantly (during phase change) and the latent heat is low, pressure has a greater role.
 

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