of 188 kg/min and exits at 17 degree C. Assuming the ideal gas model for air and

Question

of 188 kg/min and exits at 17 degree C. Assuming the ideal gas model for air and ignoring kinetic and potential energy effects, determine the mass flow rate of the Refrigerant 134a. in kg/min. and the heat transfer between the heat exchanger and its surroundings, in kJ/min. As sketched in Fig. P4.78, a condenser using river water to condense steam with a mass flow rate of 2 times 105 kg/h from saturated vapor to saturated liquid at a pressure of 0.1 bar is proposed for an industrial plant. Measurements indicate that several hundred meters upstream of the plant, the river has a volumetric flow rate of 2 times 105 nvVh and a temperature of 15 degree C. For operation at steady state and ignoring changes in kinetic and potential energy, determine the river-water temperature rise, in degree C, downstream of the plant traceable to use of such a condenser, and comment. Figure P4.79 shows a solar collector panel embedded in a root. The panel, which has a surface area of 24 ft2, receives

Explanation / Answer

from the steam table we can say that the saturation temperature of steam at .1 bar is 45.81c so for steady operation change in river water temperature is (45.18-15= 30.18c). for doing so we need a boiler just before compressor.

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