4-1-9 [jy] an insulated high-pressure electric water heater operates at steady state at a constant pressure of 10 mpa, supplying hot water at a mass flow rate (m⋅) of 10 kg/s. if the inlet temperature is 20oc and the exit temperature is 200oc, determine (a) the electrical power consumption (w⋅el) , (b) the volume flow rate (v·1) in l/min at the inlet, (c) the volume flow rate (v·2) in l/min at the exit, and (d) the rate of entropy generation (s⋅gen) in the heater. use the pc model for water, neglect any pressure drop in the heater, and also neglect any change in ke or pe.

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w