How do the following parameters affect efficiency and power

How do the following parameters affect efficiency and power output of steam plant? Assume the same steam flow through the engine? Briefly state your reasons. Increase in condenser pressure Reheating the steam and returning it to the turbine Adding an additional regenerator to the cycle. How do the following parameters affect the efficiency and power of a gas turbine (increase, decrease or no change)? For each case assume that other parameters remain unchanged. Briefly state your reasons. Increase in compressor pressure ratio Increase in combustion (turbine inlet) temperature Increase in ambient temperature How do the following parameters affect (increase, decrease or no effect) the performance (COP) of a refrigeration cycle? Briefly state your reasons. Increase in compressor suction pressure Increase in compressor discharge pressure Inter-cooling in a two stage refrigeration compressor system

Solution

A ) Increase in condenser pressure lowers power output and efficiency because of less work being extracted from turbine.

      Reheating the steam increases the efficiency and power output of the turbine by increasing the enthalpy of the steam used in the turbine.

     Adding an additional regenarator doesn\'t lowers power output but improves overall efficiency by extracting some steam from turbine and using it to preheat the water to the boiler.

B) Increase in compressor ratio has no effect on power output and lowers efficiency of the gas turbine.

     increase in combustion temperature increases power output and efficiency of gas turbine

     increase in ambient tmperature decreases power output and efficiency of turbine