where n is an index which is varied among these processes: n=0 for isobaric process, n=1 for isothermal process, n=κ for isentropic process, and 1<n<κ or n>κ for polytropic process. p is pressure of air, and v is specific volume. The air enthalpy variations depends on the air ...
A heat engine for carrying out the process comprises; an isothermal compressor to which a liquid injection mechanism is connected; an isentropic compressor; an expansion machine to which a vapor generator is connected; and at least one additional expansion machine with liquid separator; said ...
A compression process is explored under both standard air and real air while exergy destructions are determined for both cases. Reference conditions for both cases are taken at 25°C and 101.325 kPa and isentropic efficiencies of the compressors are assumed to be 85%. For the air standard ...
aIn this model, it is assumed that during the vaporization process, only a fraction y of the fluid is transformed into saturated mixture, the other fraction (1-y) remains metastable liquid and is submitted to an isentropic evolution. 在这个模型,它假设,在汽化过程期间,只有流体的分数y被变换成饱...
A compressor works with compressible fluids and the specific work for an isentropic compressor process can be expressed with the help of p1 v1κ = p2 v2κ (3) where v= volume (m3) κ = cp / cv - ratio of specific heats (J/kg K) Specific work: w = κ / (κ -1) R T1 (( ...
a) How does a polytropic process differ from an isentropic process? b) What is the equation of path for a polytropic process? What happens to entropy in an irreversible cyclic process? 1) Give an example of a spontaneous process in which a system becomes less ordered and energy becomes less...
a) How does a polytropic process differ from an isentropic process? b) What is the equation of path for a polytropic process? 1. Consider a steady-flow mixing process. Under what conditions will the energy transported into the control volume by the incoming str...
aFor a two-stroke diesel engine, air is first ingested and then compressed in the engine’s cylinders. After the inlet air is compressed, the pressure in the cylinder is very high. Assume this process to be followed by an isentropic compression stroke [a2] , the pressure in the cylinder ...
To correctly characterize the effect of heat transfer requires a new property, 'mechanical work potential', which is a measure of the maximum useful work that can be extracted from a fluid by an isentropic turbine exhausting to a fixed exit static pressure. A balance equation for the property,...
Statistical analysis in terms of microstate probabilities p_{i}(t) uniquely identifies dW(t) as isentropic and dQ(t) as isometric (see text) change in dE(t); such a clear separation does not occur for exchange quantities. Hence, our new formulation of the first law provides tremendous ...