A mechanical refrigeration system shown below with R-1234yf is operating under such conditions that the evaporator pressure is 150 kPa and the liquid approaching the refrigerant control valve is at a temperature of 40 C. Assume state 1 is saturated vapor and state 3 is saturated liquid. If the system has a capacity of 15 kW, determine: a. the refrigerating effect per kilogram of refrigerant circulated [kJ/kg], b. the mass flow rate per refrigeration capacity [kg/s-kW], c. volume flow rate per refrigeration capacity [L/s-kW] at the compressor inlet, d. total mass flow rate [kg/s], e. compressor power [kW] if the isentropic efficiency is 0.8; (Note: If needed, use the closest isobar given in tables), f. COP, g. Condenser heat rejection [kW], h. Massflow [kg/s], i. Compressor discharge temperature [C] (Note: Use the closest isobar given in tables), j. Show the cycle on P-h state diagram, showing/labeling isothermal, isobaric, and isenthalpic lines with given values. Show the states with points and labels.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A mechanical refrigeration system shown below with R-1234yf is operating under such conditions
that the evaporator pressure is 150 kPa and the liquid approaching the refrigerant control valve is
at a temperature of 40 C. Assume state 1 is saturated vapor and state 3 is saturated liquid. If the
system has a capacity of 15 kW, determine:
a. the refrigerating effect per kilogram of refrigerant circulated [kJ/kg],
b. the mass flow rate per refrigeration capacity [kg/s-kW],
c. volume flow rate per refrigeration capacity [L/s-kW] at the compressor inlet,
d. total mass flow rate [kg/s],
e. compressor power [kW] if the isentropic efficiency is 0.8; (Note: If needed, use the closest
isobar given in tables),
f. COP,
g. Condenser heat rejection [kW],
h. Massflow [kg/s],
i. Compressor discharge temperature [C] (Note: Use the closest isobar given in tables),
j. Show the cycle on P-h state diagram, showing/labeling isothermal, isobaric, and isenthalpic
lines with given values. Show the states with points and labels.
Transcribed Image Text:A mechanical refrigeration system shown below with R-1234yf is operating under such conditions that the evaporator pressure is 150 kPa and the liquid approaching the refrigerant control valve is at a temperature of 40 C. Assume state 1 is saturated vapor and state 3 is saturated liquid. If the system has a capacity of 15 kW, determine: a. the refrigerating effect per kilogram of refrigerant circulated [kJ/kg], b. the mass flow rate per refrigeration capacity [kg/s-kW], c. volume flow rate per refrigeration capacity [L/s-kW] at the compressor inlet, d. total mass flow rate [kg/s], e. compressor power [kW] if the isentropic efficiency is 0.8; (Note: If needed, use the closest isobar given in tables), f. COP, g. Condenser heat rejection [kW], h. Massflow [kg/s], i. Compressor discharge temperature [C] (Note: Use the closest isobar given in tables), j. Show the cycle on P-h state diagram, showing/labeling isothermal, isobaric, and isenthalpic lines with given values. Show the states with points and labels.
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