Thermodynamics Compare the compressor work input required to compress water isentropically from 100 kPa to 1...
Compressing a substance in the Liquid versus Gas Phases EXAMPLE 7-12 Determine the compressor work input required to compress steam isentropi- cally from 100 kPa to 1 MPa, assuming that the steam exists as (a) satu- T rated liquid and (b) saturated vapor at the inlet state. SOLUTION Steam is to be compressed from a given pressure to a specified pressure isentropically. The work input is to be determined for the cases of steam being a saturated liquid and saturated...
1 MPa Isentropic Efficiency of a Compressor Refrigerant-134a enters an adiabatic compressor as a saturated vapor at 100kPa at a rate of 0.7 m/min and exits at 1-MPa pressure. The isentropic efficiency of the compressor is 87%. R-134a Compressor Isentropic Compressor Work hs-h 100 kPa sat. vapor Actual Compressor Work Determine the refrigerant properties at the inlet and outlet for an isentropic process. Actual 2s entropic procEss Inlet state Determine the actual isentropic enthalpy from the efficiency. (Ans: 289.71 J/kg)...
6. Refrigerant-134a enters an adiabatic compressor as saturated vapor at 100 kPa at a rate of 0.7 m3/min and exits at 1 MPa pressure. If the isentropic efficiency of the compressor is 87%, determine (a) the temperature of the refrigerant at the exit of the compressor, (b) the power input (in kW), and (c) the rate of entropy generation during this process.
Please show all work 4-68 A centrifugal compressor is steadily supplied with saturated water vapor at 15 kPa; 500 kg of water is compressed per hour to 350 kPa, 160°C. During the process the rate of heat removal from the water is 0.8 kW. Determine the power r \ required to compress the water.
The power required to compress 0.01 kg/s of steam from a saturated vapor state at 50 °C toa pressure of 800 kPa at 200 °C is 6 kW. Find the rate of heat transfer from the compressor.
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20° C, and exits at 1 MPa and 60° C. The refrigerant is cooled to 35° C in the condenser and then expands back to 100 kPa through an expansion valve. Neglect pressure losses within the condenser and evaporator. The refrigerant flow rate is 0.10 kg/s. Calculate the following a) the rate of heat removal from the cooled space, in kw, b) the rate of...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. Determine the compressor work per unit mass for (a) isentropic compression with k 1.4, (b) a compressor with 85% isentropic efficiency, (c) two-stage compression (100 kPa to 300 kPa, and 300 kPa to 900 kPa) with intercooling with an isentropic efficiency of 85% for both compressors. (50 points) 2.
Estimate the work necessary to compress the air in an air-compressor cylinder from a pressure of 100 kPa to 2000 kPa. The initial volume is 1000. An isothermal process is to be assumed.
A 4-kW pump operating at steady state draws in liquid water at 100 kPa, 15?C with a mass flow rate of 4.5 kg/s and delivers water at 1 MPa pressure. Ignore the kinetic and potential energy changes from inlet to exit. Determine (a) the isentropic efficiency of the pump and (b) whether the power input rating is adequate
A constant pressure piston/cylinder has 1 kg of saturated liquid water at 100 kPa. a rigid tank contains air at 1200k, 1000 kPa. they are now thermally connected by a reversible heat engine cooling air tank and boiling the water to saturated vapor. Find the required amount of air and the work out of the heat engine.