Why compressor is used for refrigeration cycle, instead of pump.?

Question

i saw compressor is the driving force of refrigerant gas.

Answer 1

A pump moves fluid at more or less constant pressure.

A compressor is a pump that also increases pressure.

The fluid (in vapor form) must have its pressure increased, so the unit that performs this task is usually called a compressor, not just a pump.this is answer.

Answer 2

A pump increases the velocity of a fluid. A compressor increases the pressure of a fluid.

The refrigeration cycle works because of the ideal gas law:

P*V=n*R*T

If you want to control T (temperature), solve for T:

T = P * ( V / (n * R) )

The above equation explains why a change in pressure (and therefore a compressor) is needed to cause a change in temperature - which is what we are looking for in refrigeration.

Answer 3

A pump moves fluid at more or less constant pressure.

A compressor is a pump that also increases pressure.

The fluid (in vapor form) must have its pressure increased, so the unit that performs this task is usually called a compressor, not just a pump.

Answer 4

Both pumps and compressors increase the pressure of the working fluid.  However, a pump is used to increase the pressure of a liquid, while a compressor is used to increase the pressure of a gas.  A conventional vapor-compression refrigeration cycle uses R-134a (or some variant), which exhibits a phase change during the cycle.  The fluid exits the evaporator in a gaseous phase at a relatively low pressure, so a compressor is used to bring the fluid up to the proper pressure to return to a liquid phase in the condensor.  Note that any vapor-compression cycle utilizes a fluid that exhibits a phase change during the cycle, and is therefore NOT an ideal gas.  The ideal gas law does not apply for these fluids.