Engineering, 14.04.2020 16:11 Bloom247
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 0C. The refrigerant enters the condenser at 16 bar and 160 0C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the refrigerating capacity is 150 kW, determine: (a) the mass flow rate of the refrigerant, in kg/s. (b) the power input to the compressor, in kW. (c) the coefficient of performance. (d) the isentropic compressor efficiency. (e) the rate of entropy production, in kW/K, for the compressor.
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Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
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Engineering, 04.07.2019 18:20
Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false
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In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 0...
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