I need short answer 216 MASS AND ENERGY ANALYSIS Cold water 20°C 5 L/min 300 L 4
ID: 701452 • Letter: I
Question
I need short answer 216 MASS AND ENERGY ANALYSIS Cold water 20°C 5 L/min 300 L 45°C Warm water 45°C 0.5 m/s FIGURE P6-14 Flow Work and Energy Transfer by Mass 6-15C What is flow energy? Do fluids at rest possess any flow energy? 6-16C How do the energies of a flowing fluid and a fluid at rest compare? Name the specific forms of energy associ- ated with each case. 6-17 A house is maintained at 1 atm and 24°C, and warm air inside a house is forced to leave the house at a rate of 150 m3/h as a result of outdoor air at 5°C infiltrating into the house through the cracks. Determine the rate of net energy loss of the house due to mass transfer. Answer: 0.945 kW 6-18E A water pump increases the water pressure from 15 psia to 80 psia. Determine the flow work, in Btu/lbm required by the pump. 6-19 Refrigerant-134a enters the compressor of eration system superheated vapor at 0.8 MPa and 60°C at a Determine the rates of energy transfers by m of the compressor. Assume the kinetic and as saturated vapor at 0.14 MPa and leaves a refrig- as rate of 0.06 kg/s.
Explanation / Answer
Flowing fluids possess flow energy in addition to the kinds of energy possessed by a fluid at rest. The total energy of a fluid at rest consists of internal, kinetic, and potential energies. The total energy of a flowing fluid consists of internal, kinetic, potential, and flow energies.