Determine the work required by a reversible pump operating with the same conditions, in kW, and the isentropic pump efficiency.
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- An air enters a compressor at 120 kPa, 20 C with volume flow rate of 10m^3/min. It then exits the compressor at 1.5Mpa and 145 C. Calculate the power input to drive the compressor (under steady state) when heat transfer from the compressor is 2 kW.In a piston cylinder system, a fluid at 0.8 bar occupying 0.07 m³ is compressed reversibly to a pressure of 10.2 bar and specific volume of 0.6 m³/kg according to the law p = c. The fluid then expands reversibly according to the law pv² = c to 1.1 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the net work for the process in Joules. To 3 d.p. and insert the unit symbol joules.In a piston cylinder system, a fluid at 0.5 bar occupying 0.10 m3 is compressed reversibly to a pressure of 11.3 bar and specific volume of 0.3 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 2.4 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the net work for the process in Joules
- A closed gas system undergoes a reversible process during which 6.3 Kcal are expelled, the volume changes from 0.142 m³ to 0.0566 m³, and the pressure remains constant at 3.515 kg/cm² abs. Find the change in internal energyThree pounds mass of water in a piston-cylinder assembly, initially a saturated liquid at 15 lbş/in?, undergoes a constant pressure, internally reversible expansion to x2 = 90%. For this reversible process, determine the work by integrating p dV and the heat transfer by integrating T dS, each in Btu.b- A 2kg/s of steam enters a turbine at 1Mpa ,400 °C with a velocity of 10m/s and leaves at very slow velocity with 0.3Mpa .determine the specific work and power produced . Superheated Vapor Water Temp. ("C) (m³kg) (kJ/kg) (kJ/kg) (kJ/kg-K) (m'/kg) (k/kg) (KJ/kg) (kJ/kg-K) 300 kPa (133.55) 400 kPa (143.63) 250 0.79636 2728.69 2967.59 7.5165 0.59512 2726.11 2964.16 7.3788 300 0,87529 2806.69 3069.28 7.7022 0.65484 28C4.81 3066.75 7.5661 800 kPa (170.43) 1000 kPa (179.91) Sat. 0.24043 2576.79 2769.13 6.6627 0.19444 2583,64 2778.08 6.5864 200 0.26080 2630.61 2839.25 6.8158 0.20596 2521.90 2827.86 6.6939 250 0.29314 2715.46 2949.97 7.0384 0.23268 2709.91 2942.59 6.9246 300 0.32411 2797.14 3056.43 7.2327 0.25794 2793.21 3051.15 7.1228 350 0.35439 2878.16 3161.68 7.4088 0.28247 2875.18 3157.65 7,3010 400 0.38426 2959.66 3267.07 7.5715 0.30659 2957.29 3263,88 7.4650 500 0.44331 3125.95 3480.60 7.8672 0.35411 3124.34 3478.44 7.7621
- A fluid at 0.5 bar occupying 0.08 m3 is compressed reversibly to a pressure of 10.9 bar and specific volume of 0.6 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 1.6 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the net work for the process in Joules.A fluid at 0.7 bar occupying 0.09 m3 is compressed reversibly to a pressure of 9.8 bar and specific volume of 0.3 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 1.2 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the work for the expansion in the process in Joules.A pump operating at steady state receives 2.7 kg/s of liquid water at 50°C, 1.5 MPa. The pressure of the water at the pump exit is 14 MPa. The magnitude of the work required by the pump is 42 kW. Stray heat transfer and changes in kinetic and potential energy are negligible. Determine the work required by a reversible pump operating with the same conditions, in kW, and the isentropic pump efficiency.
- An air conditioning unit delivers 8.24 m3/s of air at 15.2°C DB and 85% RH to maintain 26.5°C DB and 50% RH room conditioned. The air conditioning unit extracts 65% by weight of room air. The balance being made up by outside at 34.7°C DB and 60% RH. Determine the following: a. mass flow rate of supply air in kg/s b. sensible heat load in kW at the conditioned room c. latent heat load in kW at the conditioned room d. total heat load in kW at the conditioned room e. refrigeration load in kWA water pump operating at steady state has 76 mm diameter inlet and exit pipes, each at the same elevation. The water can be modeled as incompressible and its temperature remains constant at 20°C. For a power input of 1.5 kW, determine the pressure rise from inlet to exit, in kPa at the volumetric flow rate of A m/s (A=0.015 m/s, 0.017 m/s, 0.02 m/s). Plot the A- the pressure rise from inlet to exit in graph.Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80oF with a velocity of 1200 ft/s. The inlet area is 1.4 in2. At the exit, the pressure is 400 lbf/in2 and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in lb/s, and the exit temperature, in oF.