Problem 4 Skills: Heat exchangers, approach temperature difference.For all cases below, the working fluid flows through a heat exchanger (HX) from left to right andeither rejects heat to a heat sink reservoir maintained at Tc = 50°F or absorbs heat from a heatsource reservoir maintained at TH = 700°F. Pressure is assumed constant, and the approachtemperature difference is 30°F for all cases. Assignment: Sketch qualitatively temperaturevariation from the inlet to the outlet inside each HX (two lines, one for colder substance, one forwarmer substance). For each case calculate and mark on sketch the one temperature of theworking fluid (either at the inlet or at the outlet) that can be determined from the informationprovided.(a) Boiler: Compressed (liquid) water is heated up and exits as superheated steam(b) No phase change: Hot air is being cooled down© Condenser: Refrigerant R134a enters as superheated and exits as saturated liquidCan pressure be determined for any of the three cases? Explain

• Write neatly and explain your work. Use ample space.
• State the problem, including ‘Given’, ‘Find’ and ‘Solution’.
• Draw hardware diagrams with numbered states.
• Draw property diagrams (T-s, P-v) showing all states.
• Define clearly (draw) all systems you analyze.
• State all assumptions made, and the principles or laws used.
• Show unit consistency for all calculations.
• Mark all the answers, including the units.