Originally Posted by
becky
i have a few questions and thought some of you may be able to help me/re-assure me.
i have a few bits of test data and need to work out different COPs, firstly the chart COP using the work input found from the p-h chart, which i think means (h1-h4)/(h2-h1)?
then the system COP using the mechanical power which i think is (h1-h4)/mech power, but i dont have mech power directly i have rpm & torque.
then also the overall COP from using the electrical power which i think is (h1-h4)/elec work but i dont have electrical power directly either but i think that is volts x amp x power factor (which i have)
also why do all the values obtained for the COPs differ?
what is considered to be the optimum condition of a refrigerant at entry to the compressor, what are the actual conditions and the reasons for this?
what happens when the heat transfer to the evapourator is reduced, and what happens if the heat transfer from the condenser is serverly reduced or even cut off?
any help would be great :)