The refrigerant circulating in the following system is R404A; the data of the system is as follows: Tev1= -20 oC Tev2= 0 oC, Qev1=10 kW, Qev2=20 kW, Tkon= 40 oC, the efficiency for the compressor is nik=0.80, nmk=0.90, nkk=0.95, nem=0.95. 10 oC over-cooling and 10 oC over-heating will be done in the system. a) draw p-h and T-s diagrams of the cycle. b) 1. and 2. calculate the mass flow through the evaporator and through the compressor. c) determine the temperature (T2) and enthalpy (h2) at the compressor output. d) 1. and 2. determine the degree of dryness when entering the evaporator. e) What would have happened if the expansion valve between stations 5 and 6 had not been used? f) find the power consumed by the compressor. g) determine the cooling performance coefficient COPSM value. H) calculate condenser capacity. I) calculate the heating performance coefficient (COPIP) of the system.
The refrigerant circulating in the following system is R404A; the data of the system is as follows: Tev1= -20 oC Tev2= 0 oC, Qev1=10 kW, Qev2=20 kW, Tkon= 40 oC, the efficiency for the compressor is nik=0.80, nmk=0.90, nkk=0.95, nem=0.95. 10 oC over-cooling and 10 oC over-heating will be done in the system.
a) draw p-h and T-s diagrams of the cycle.
b) 1. and 2. calculate the mass flow through the evaporator and through the compressor.
c) determine the temperature (T2) and enthalpy (h2) at the compressor output.
d) 1. and 2. determine the degree of dryness when entering the evaporator.
e) What would have happened if the expansion valve between stations 5 and 6 had not been used?
f) find the power consumed by the compressor.
g) determine the cooling performance coefficient COPSM value.
H) calculate condenser capacity.
I) calculate the heating performance coefficient (COPIP) of the system.
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