Does Pressure Affect Heat Absorption and Release in Heat Pumps?

In summary, the amount of heat absorbed by a refrigerant for phase change at low pressure is about the same as the heat given out by the compressed refrigerant at high pressure. The amount of heat required for phase change from liquid to vapor is less at low pressure, and the amount of heat required for condensation depends on the applied pressure. The heat pump utilizes the latent heat property of the refrigerant to absorb and reject more heat at small temperature differences. Pressure does have an effect on latent heat, especially for substances with significant volume changes and low latent heat.
  • #1
firecool
11
0
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
 
Engineering news on Phys.org
  • #2
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.
 

Related to Does Pressure Affect Heat Absorption and Release in Heat Pumps?

What is a heat pump?

A heat pump is a device that transfers heat from one location to another using electricity. It can be used for both heating and cooling purposes.

How does a heat pump work?

A heat pump works by using a compressor and a refrigerant to absorb heat from a cold space and release it into a warm space. This process can be reversed to provide cooling as well.

What are the benefits of using a heat pump?

One of the main benefits of using a heat pump is its energy efficiency. It uses electricity to transfer heat rather than generating it, making it more cost-effective. It is also a more environmentally friendly option compared to traditional heating and cooling systems.

Can a heat pump be used in any climate?

While heat pumps are more commonly used in moderate climates, they can still be used in colder climates. However, they may not be as efficient in extreme cold temperatures.

What maintenance is required for a heat pump?

Regular maintenance for a heat pump includes cleaning or replacing air filters, checking refrigerant levels, and inspecting the outdoor unit for any debris or obstructions. It is recommended to have a professional service and inspect the heat pump once a year.

Similar threads

Replies
3
Views
2K
Replies
8
Views
2K
  • Mechanical Engineering
Replies
1
Views
698
Replies
7
Views
824
Replies
1
Views
2K
Replies
53
Views
9K
  • Thermodynamics
Replies
6
Views
1K
  • Mechanical Engineering
Replies
3
Views
2K
Replies
3
Views
2K
  • Mechanical Engineering
Replies
3
Views
1K
Back
Top