Assumptions in Thermodynamic Cycles

Assumptions in Thermodynamic Cycles Points : Assumptions in Thermodynamic Cycles The analysis of all thermodynamic cycles (or air cycles) is based on the following assumptions.

1. Heat is supplied by bringing a hot body in contact with the cylinder at appropriate points during the process. Similarly heat is rejected by burning a cold body in contact with the cylinder at these points.
2. All the compression and expansion processes are adiabatic and they take place without any internal friction.
3. No chemical reaction, whatsoever takes place in the engine cylinder.
4. The gas in the engine cylinder is a perfect gas, i.e. it obeys the gas laws and constant specific heats.
5. The cycle is considered to be a closed one, and the same air is used again and again to repeat the cycle.
6. The physical Constants of the gas in the engine cylinder are same as those of air at moderate temperature.