The total flow which is a sum of the main gas flow, required for gas isentropic compression
, and the extra flow caused by gas recirculating from the discharge line, is proportional to the impeller tip speed.
A model is developed for extra specific enthalpy rise beyond that needed to achieve outlet pressure for an isentropic compression
O'Donovan and Rallis , and Bradley and Mitcheson  among others derived expressions for the flame radius by dividing the control volume into burned and unburned gases assuming the isentropic compression
, spherical flame, and spatially uniform pressure.
The process 1-2 is an isentropic compression
process in which the inlet air (Pressure of 1.013 bar and volume of 0.985 [m.sup.3]) is compressed to pressure of 49 bar and volume is reduced to 0.0615 [m.sup.3].
The analysis of variation of physical properties of pure and blend refrigerants such as evaporator pressure ([P.sub.evap]), pressure ratio, isentropic compression
work (W), refrigeration effect (RE), power consumption (P), volumetric refrigeration capacity (VCR), coefficient of performance of heating ([COP.sub.h]) and coefficient of performance of cooling ([COP.sub.C]).
2007) showed that, for a single stage refrigeration system operating with R134a between evaporating and condensing pressures of -27[degrees]C (80.6[degrees]F) and 42[degrees]C (107.6[degrees]F), isothermal compression can be as high as 16% more efficient than isentropic compression
* The isentropic compression
efficiency was taking as 0.8.
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.
For isentropic compression
, [W.sub.C] = m ([h.sub.2]-[h.sub.1]) (1)
For estimation, an isentropic compression
is assumed again.