The process 1-2 is an isentropic compression
process in which the inlet air (Pressure of 1.
evap]), pressure ratio, isentropic compression
work (W), refrigeration effect (RE), power consumption (P), volumetric refrigeration capacity (VCR), coefficient of performance of heating ([COP.
Assumptions are an isentropic compression
, a constant pump compression ratio [[epsilon].
On the other hand, efficiency-based models rely on first-principles compression process such as isentropic compression
and theoretical volumetric efficiency.
6[degrees]F), isothermal compression can be as high as 16% more efficient than isentropic compression
The isentropic compression
efficiency was taking as 0.
Knowing P1, T1 at the compressor inlet and isentropic compression
, the temperature at the isentropic compression
out point can be determined.
The technique--so relatively cold that tongue-in-cheek researchers have dubbed it ICE (for Isentropic Compression
Experiments)--is a far faster and less expensive way to test materials over a wide range of stresses.
In the ideal version of the vapor-compression refrigeration cycle, process 1-2 is one of isentropic compression
, with the refrigerant initially entering the compressor as a saturated vapor and leaving in a superheated state.
Conventional reciprocating compressors operate on the efficient nearly isentropic compression
Compressor's cycle energy consumption can be calculated by the equation of isentropic compression
It should be noted that the compression work needed by the main compressor is reduced as the pressure increase of the subcompression increases, because the slope of the isentropic compression
line becomes nearly vertical when the subcompression is started in an area where the enthalpy is reduced by intercooling.