and aver7-140 The inner and outer surfaces of by chilledwall of thickness 20 cm
ID: 2073725 • Letter: A
Question
and aver7-140 The inner and outer surfaces of by chilledwall of thickness 20 cm are maintained a 4-m surfactained at temperatures of a heat transfer throu nerage mass of 22 kg and aver fhow-type immersion chiller ens are dropped into the the wall is 1250 W, determine the rate of ent the r C are to be cooled by 16 and 4, respectively. If the rate of entropy o .aredenersion chiller ens are dropped into the within the wall rated liquid water at 275-kPa pressure. Contain is transferred to water from a sourc the liquid vaporizes at constant pres 14 A frictionless piston-cylinder dev satu- at (537 and part of 600 Determine the J/K, chilling process. entropy B entropy generated during this process, in k Otal and by heating them = 7-142 Steam enters an adiabatic nozzle at 2 350 with a velocity of 55 m/s and exits at ic 0.8 xol slowly 390 mls. If the nozzle has an inlet area of 7.5 cm2 be annealed n the balls (a) the exit temperature and (b) the rate tion for this Answers rature and (b) the rate of entropyo ess. Answers: (a) 303°C, () 0.085 WK -146 7-143 Steam expands in a turbine steadily ata rat is 8.2 MW, determine the rate of entropy gene process. Assume the surrounding medium is at 25°C Answer: 11.4 KW/K of opened, an kPa as saturated vapor.If the power generated by the turhine soUrce at 40,000 kg/h, entering at 8 MPa and 500°C and leavi ank in the source at 2 water at 40 constant. D ration for this he total 8 MPa 500°C 1-147 AniExplanation / Answer
7.141
entropy = heat change/temp, here T = 537 + 273 = 810 K
so, S= Q/T
= 600kj/810 = 0.7407 kj/kelvin
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