Consider the evaporator section of an air-conditioning system (note: the evaporator may be considered as a shell and tube heat exchanger with refrigerant flowing through the tube and air flowing through the shell). air enters the evaporator at 32◦c and 1 bar with a volumetric flow rate of 50 m3/min and exits at 22◦c and 0.95 bar. refrigerant 134a at 5 bar with a quality of 20% enters the evaporator and leaves at 20◦c at the same pressure. assume steady state operation, negligible heat transfer at the outer surface of the heat exchanger, and negligible kinetic and potential energy effects. also, assume the air behaves as an ideal gas with constant specific heats. determine

An array of m-50 thermoelectric modules is installed on the exhaust of a sports car. each module has an effective seebeck coefficient of sp of 0.143 5vk and an internal electrical resistance of r.-4 ? in addition, : (15 points each module is of width w 60mm and contains n=100 pairs of semiconducting pellets. each pellet hasan overall length of 2l-5mm and a cross-sectional area as 1.2 x 10'm and is characterized by a thermal conductivity of kpl2w rnk. the hot side of each module is exposed to exhaust gases at·p650c with hia4ow rrk while the osite side of each module is cooled by pressurized water at surface) and 156 °c (at the cool surface). 11s c with h: -500w/m'k. the modules are wired n series and the load resistance is r d=400ohm .the module surface temperatures, t, and ts are 183 "c (at the hot surface and 156c (at the cool surface) a)-draw a schematic of this scenario and label all parts. a. b. if the induced current, i, is 0.15 amps, what is the total power (pa) for one module? c. what is the total power harvest from the exhaust with all 50 modules?