Engineering, 14.09.2019 01:30 xandrygentile
Aclosed piston-cylinder device initially contains one kilogram of water vapor at an absolute pressure of 3 bar and a temperature of 160 c (state 1). heat transfer occurs so that the water vapor expands via a process during which pv^(1.2) = constant and the absolute pressure inside the cylinder drops to 1 bar (state 2). (a) determine the initial and final specific volume (m3 /kg) of water.(b) calculate the work (kj) during the process.(c) find the heat transfer (kj) during the process.(d) show the expansion process on t-v diagram. label states, show property values, and indicate appropriate lines of constant pressure.
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, lowkeyqueenk
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 18:10, mamasbug4285
An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0
Answers: 3
Aclosed piston-cylinder device initially contains one kilogram of water vapor at an absolute pressur...
Mathematics, 16.10.2021 01:50