Chapter 7, Problem 7.43P

Steam at 1 kg / s mass flow enters a steam isentropic turbine at a pressure of 4 MPa, a temperature of 300ºC and a speed of 50 m / s, and leaves it at a pressure of 150 kPa and a speed of 200 m / s. . Note: T0 = 25 ºC, P0 = 100 kPa, T (K) = 273 + ºC   a) Find the power produced by the turbine.b) Find the reversible power produced by the turbine.c) Find the isentropic efficiency of the turbined) Find the second law efficiency of the turbine.

2. Air enters a reversible compressor steadily and it is compressed from an inlet temperature and pressure of 25 deg C and 100 kPa respectively Air leaves the compressor at 1000 kPa. Compute the compressor per unit mass for an isentropic compression. wwwm

Air with a pressure of 0.1 MPa and a temperature of 25oC with a flow rate of 5.29 kg/minute enters a three-stage reciprocating piston compressor with intercooler. The air is compressed polytropically (n = 1.3) to reach the pressure of 4 MPa. Calculate: a) The pressure at stage-2 and stage-3 so that the compression work is minimum? b) The compression work in each stage and the total compression work? c) The outlet air temperature from each stage's cylinder? d) The amount of heat transferred to each intercooler? e) How much air is needed for cooling in the intercooler if the allowable maximum temperature changes between the inlet and outlet of the intercooler is 8oC?

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I need help on the following question: The vapour compression cycle (picture provided), utilises the refrigerant R134a flowing at 0.05 kg s-1. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, then: 1. You need to determine the theoretical input power to the compressor and the heat transfer (Φ) to theevaporator. Take the enthalpies h1, h2, and h3 to be 238.41, 263.68 and 81.5 kJ kg-1 (use the 'NH3 Refrigeration Table' where you can find online). 2. You need to determine the coefficient of performance based on your answer to the previous question (1). 3. You need to determine the compressors mechanical efficiency.

Ex1/ air has pressure 100 kN/m and temperature 20°C this air is compressed by adiabatic process at rate 10 kg/s if he pressure ratio is ). If the isentropic efficiency is 0.85 calculate the final temperature and pressure and power consumed by compressor. Sol/

I need help with some review problemsfor thermo! thank you  Air at 100 kPa and 280K is compressed steadily to 600 kPa and 400K in an air compressor. The mass flow rate of air through the compressor is 0.02 kg/s and the compressor a heat loss of 16 kJ/kg from the compressor occurs. Assuming steady state steady flow conditions and ideal gas behavior (with constant specific heats, Cp=1.009 kJ/kgK, R=0.287 kJ/kgK, determine: a)The necessary power input to the compressor (kW).b)The volumetric flow rate of air at the exit of the compressor (m3/s).

In a Geothermal field, saturated steam at 5 MPa is available flowing at a rate of 90,000 kg/hr per extraction well. There will be two 25 Megawatts of steam turbine-generator units to be installed. Exhaust is at 7 kPa and the over-all efficiency of the the steam generator is 80%. How many wells has to be operated to drive the 2 units of steam generators at fulI capacity considering steam enters the turbine at 4.8 MPa? Sketch the plant schematic diagram and the t-s diagram.