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
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 16:10
The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.
Answers: 1
Engineering, 04.07.2019 18:10
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.
Answers: 1
Engineering, 04.07.2019 18:10
Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux
Answers: 3
Arefrigerator uses refrigerant-134a as the working fluid and operates on vapor- compression refriger...
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