Question: For all cases below, the working fluid flows through a heat exchanger (HX) from left to right and either rejects heat to a heat sink

For all cases below, the working fluid flows through a heat exchanger (HX) from left to right and either rejects heat to a heat sink maintained at Tc = 50 F or absorbs heat from a heat source maintained at TH = 700 F. Pressure is assumed constant and the approach temperature difference is 30F for all cases.

Task: Sketch qualitatively temperature variation from the inlet to the outlet inside each HX. For each case calculate and mark on sketch one temperature of the working fluid (either at the inlet or at the outlet).

(a) Boiler: Liquid water is heated up and exits as superheated steam

(b) No phase change: Hot air is being cooled down

(c) Condenser: Refrigerant R134a enters as superheated and exits as saturated liquid Can pressure be determined for any of the three cases? Explain.

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