The figure below provides steady-state data for a throttling valve in series with a heat exchanger....

 

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The figure below provides steady-state data for a throttling valve in series with a heat exchanger. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of P2 = 2 bar. The refrigerant then enters the heat exchanger, exiting at a temperature of 10°C with no significant decrease in pressure. In a separate stream, liquid water at 1 bar enters the heat exchanger at a temperature of 25°C with a mass flow rate of 2.2 kg/s and exits at 1 bar as liquid at a temperature of 15°C. Stray heat transfer and kinetic and potential energy effects can be ignored. Saturated liquid R-134a at P₁ = 9 bar 2 Valve P₂ 5 T5 = 15°C Ps= P4 -Heat exchanger 3 www www m4 4 Water T4=25°C P4 = 1 bar P3 = P2 T3 = 10°C Determine: (a) the temperature, in °C, of the refrigerant at the exit of the valve. T₂= °C (b) the mass flow rate of the refrigerant, in kg/s. m2 kg/s The figure below provides steady-state data for a throttling valve in series with a heat exchanger. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of P2 = 2 bar. The refrigerant then enters the heat exchanger, exiting at a temperature of 10°C with no significant decrease in pressure. In a separate stream, liquid water at 1 bar enters the heat exchanger at a temperature of 25°C with a mass flow rate of 2.2 kg/s and exits at 1 bar as liquid at a temperature of 15°C. Stray heat transfer and kinetic and potential energy effects can be ignored. Saturated liquid R-134a at P₁ = 9 bar 2 Valve P₂ 5 T5 = 15°C Ps= P4 -Heat exchanger 3 www www m4 4 Water T4=25°C P4 = 1 bar P3 = P2 T3 = 10°C Determine: (a) the temperature, in °C, of the refrigerant at the exit of the valve. T₂= °C (b) the mass flow rate of the refrigerant, in kg/s. m2 kg/s

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Solution a The temperature of the refrigerant at the exit of the valve T2 can ... View the full answer