Engineering, 25.11.2019 20:31 Miamonroe2004
Refrigerant 134a is compressed from 2 bar, saturated vapor, to 10 bar, 90o c in a compressor operating at steady state. the mass flow rate of refrigerant entering the compressor is 7 kg/min, and the power input is 10.85 kw. kinetic and potential energy effects can be neglected.(a) determine the rate of heat transfer, in kw.(b) if the heat transfer occurs at an average suface temperature of 50o c, determine the rate of entropy production, in kw/k.(c) determine the rate of entropy production, in kw/k, for an enlarged control volume that includes the compressor and its immediate surroundings such that the heat transfer occurs at 300 k. compare the results of parts (b) and (c) and discuss.
Answers: 1
Engineering, 04.07.2019 18:10
Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?
Answers: 3
Engineering, 04.07.2019 18:10
An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature
Answers: 2
Engineering, 04.07.2019 18:20
Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.
Answers: 3
Engineering, 04.07.2019 18:20
Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.
Answers: 1
Refrigerant 134a is compressed from 2 bar, saturated vapor, to 10 bar, 90o c in a compressor operati...
English, 07.11.2020 21:30
English, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30
Chemistry, 07.11.2020 21:30
Business, 07.11.2020 21:30
Biology, 07.11.2020 21:30
Social Studies, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30
Geography, 07.11.2020 21:30
Mathematics, 07.11.2020 21:30