Engineering, 17.07.2019 22:20 samsavage4073
Arefrigerator uses refrigerant-134a as the working fluid and operates on vapor- compression refrigeration cycle. the pressures of the evaporator and condenser are 0.2 mpa and 0.5 mpa, respectively. the isentropic efficiency of the compressor is 0.9. the mass flow rate of the refrigerant is 0.5 kg/s. assume that the refrigerator leaves the evaporator as saturated vapor, and leaves the condenser as saturated liquid, and disregard any heat transfer and pressure drops in the connecting lines between the components. (a) show the cycle on a t-s diagram with respect to saturation lines; and determine (b)the rate of heat removal from the refrigerated space; (c) the rate of heat rejection to the environment (d) the coefficient of performance.
Answers: 2
Engineering, 03.07.2019 15:10, brooklyn674
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
Answers: 3
Engineering, 04.07.2019 18:10, skpdancer1605
Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2
Answers: 3
Arefrigerator uses refrigerant-134a as the working fluid and operates on vapor- compression refriger...
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