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 process.
O'Donovan and Rallis [36], and Bradley and Mitcheson [37] 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.