Question

A 5 TR refrigeration system has suction temperature of −5∘C. The condensation takes place at 32∘C and there is no sub-cooling of the refrigerant in the refrigeration cycle. The vapour at the evaporator exit is dry saturated. Assuming isentropic compression, determine (i) Mass flow rate requirement of the refrigerant (ii) Power requirement of the compressor (iii) COP of the refrigeration system. Saturation properties of the frigerant (R−12) are given below. Take specific heat of superheated vapour, cp​=0.615 J/kgK.

Answer 1

To determine the mass flow rate requirement, power requirement, and COP of a refrigeration system, use the energy balance equation and specific enthalpy values at the condensation and evaporation temperatures.

Step-by-step explanation:

To determine the mass flow rate requirement of the refrigerant in a 5 TR refrigeration system, we can use the energy balance equation:

Qin = mass flow rate * h2 - h1

Where Qin is the heat absorbed by the refrigerant, h2 is the enthalpy at the condensation temperature, and h1 is the enthalpy at the evaporation temperature.

Similarly, the power requirement of the compressor can be calculated using the equation:

Wcomp = mass flow rate * (h2 - h1)

Finally, the COP of the refrigeration system can be determined using the equation:

COP = Qin / Wcomp