Engineering, 06.10.2019 02:30 krazyykay
Acombined cycle power plant has a net power output of 287 mw. air enters the compressor of the brayton cycle at 280 k and 100 kpa. the pressure ratio is 21, the turbine inlet temperature is 1600 k and the gases leaving the turbine are used to heat the steam of the rankine cycle to 500oc and 4 mpa. the combustion gas leaves the heat exchanger (hrsg) at 400 k and the condenser pressure is 10 kpa. the isentropic efficiency of the compressor is 90%, the gas turbine efficiency is 91%, the steam turbine efficiency is 94% and the pump efficiency is 68%. determine: a. heat input in the combustion chamber, qin (in kw) b. the overall efficiency of the cycle.
Answers: 1
Engineering, 04.07.2019 18:20
Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.
Answers: 3
Engineering, 04.07.2019 19:10
An electric kettle is made out of stainless steel, weighs two pounds (when empty) and is equipped with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling
Answers: 2
Engineering, 04.07.2019 19:20
Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?
Answers: 3
Engineering, 06.07.2019 03:10
List and describe the parts of boxford cnc milling machine with pictures?
Answers: 2
Acombined cycle power plant has a net power output of 287 mw. air enters the compressor of the brayt...
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