Engineering, 11.07.2019 03:20 Trinhphuongtran
Does a heat engine that has a thermal efficiency of 100% necessarily violate: a)-the first law of thermodynamics. b)-the second law of thermodynamics.
Answers: 2
Engineering, 04.07.2019 18:20
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.
Answers: 2
Engineering, 06.07.2019 02:30
On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)
Answers: 2
Engineering, 06.07.2019 04:10
Aheat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat water from 15°c to 45°c at a rate of 0.12 kg/s. the condenser and evaporator pressures are 1.4 and 0.32 mpa, respectively determine: (a) the power input to the heat pump
Answers: 1
Engineering, 06.07.2019 05:20
An ideal rankine cycle with reheat uses water as the working fluid. the conditions at the inlet to the high pressure turbine are 10mpa, 650°c and the steam is reheated at a constant pressure of 1.4mpa before entering the low pressure turbine. for a condenser pressure of 10kpa, plot the cycle thermal efficiency and quality of steam at the low pressure turbine exit versus reheat temperatures (the temp of steam entering the low pressure turbine) of 400, 500, and 600°c. draw the t-s diagram and show all your work for a reheat temperature of 400°c .note, there will be two plots. one with thermal efficiency on in the ordinate versus reheat temperate and the other will have quality on the ordinate versus reheat temperature. be sure to label all axes with variables and units and include title. the plots must be done on computer.
Answers: 2
Does a heat engine that has a thermal efficiency of 100% necessarily violate: a)-the first law of t...
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