Qout Condenser Compressor Expansion A valve +1 Evaporator Expansion valve Qin.2 = 2 tons Expansion A valve Evaporator 6. Qin1 =3 tons A vapour-compression refrigeration system operates with Refrigerant 134 with two evaporators with varying cooling capacity. The low temperature evaporator (#1) operates at -20°C with saturated vapour at its exit and has a refrigeration capacity of 3 tons. The higher temperature evaporator (# 2) produces saturated vapour at 3.6 bar at its exit and has a refrigerating capacity of 2 tons. Compression is isentropic to the condenser pressure of 12 bar. There are no pressure drops in the flow through the condenser and the two evaporators and the refrigerant leaves the condenser 6 saturoted liguid at 12 har Dotermine:
A vapour-compression refrigeration system operates with Refrigerant 134 with two evaporators with varying cooling capacity. The low temperature evaporator (#1) operates at -20°C with saturated vapour at its exit and has a refrigeration capacity of 3 tons. The higher temperature evaporator (#2) produces saturated vapour at 3.6 bar at its exit and has a refrigerating capacity of 2 tons. Compression is isentropic to the condenser pressure of 12 bar. There are no pressure drops in the flow through the condenser and the two evaporators and the refrigerant leaves the condenser as saturated liquid at 12 bar.
Determine:
The mass flow rate of the refrigerant in kg/s through each evaporators;
The power input for the compressor, in kW;
The coefficient of performance of this refrigeration system;
The heat transfer through the condenser in kW;
The rates of exergy destruction in each expansion valves in kW for T0 = 300K;
Draw the T-s diagram of this system.
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