does the isentropic efficiency of compressor and turbine will be effected by the ambient temperature as well
Efficiency of compressor will be slightly affected by inlet density, which is a function of ambient T and P and humidity. Turbine efficiency is affected by what flows through it, so turbine inlet flowrate, density, T and P.
Biggest impact on efficiency of compressor and turbine is however their actual volumetric flowrate. So you would need to know the actual flowrates, as well as have manufacturer curves to determine actual efficiency of compressor and turbine. But, as Bobby indicated, fouling and wear&tear will result in lower efficiencies than the curves indicate, as the machine gets older.
What is the most element do you think that will effect the cooling capacity of the refrigerant in summer : gas turbine thermal efficiency - air cooler ( condenser ) - feed gas temperature .
I don't know what you mean by feed gas temperature in this case, but I expect that in summer the aircooled condensor of the refrigerant is limiting your refrig cooling capacity.
Edited by PingPong, 09 October 2014 - 03:55 AM.