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A counterflow heat exchanger operates at steady state with negligible kinetic and potential energy effects. In one stream, liquid water enters at 108C and exits at 208C with a negligible change in pressure. In the other stream, Refrigerant 134a enters at 10 bar, 808C with a mass flow rate of 135 kg/h and exits at 10 bar, 208C. The liquid water can be modeled as incompressible with c 5 4.179 kJ/kg ? K. Heat transfer from the outer surface of the heat exchanger can be ignored.
Determine
(a) the mass flow rate of the liquid water, in kg/h.
(b) the rate of entropy production within the heat exchanger, in kW/K.
Knowing the allowable normal stress due to bending +110 MPa in tension and -150 MPa in compression, find the largest permissible value load W if beam AB is not overstressed.
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the state of liquid water is changed from 50 psia and 50 degrees f to 2000 psia and 100 degrees f. determine the change
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