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Helium is used in a combined cycle power plant as the working fluid in a simple closed gas turbine serving as the topping cycle for a vapor power cycle. A nuclear reactor is the source of energy input to the helium. The figure below provides steady-state operating data. Helium enters the compressor of the gas turbine at 200 psi, 180°F with a mass flow rate of 8x105lbm/hr and is compressed to 800 psi. The isentropic efficiency of the compressor is 80%. The helium then passes through the reactor with a negligible decrease in pressure, exiting at 1400°F. Next the helium expands through the interconnecting heat exchanger. A separate stream of liquid water enters the heat exchanger and exits as saturated vapor at 1200 psi. The vapor is superheated before entering the turbine at 800°F, 1200 psi. The steam expands through the turbine to 1 psi and a quality of 0.9. Saturated liquid exits the condenser at 1 psi. Cooling water passing through the condenser experiences a temperature rise from 60°F to 90°F. The isentropic pump efficiency is 100%. Stray heat transfer and kinetic and potential energy effects can be nelected. Determine:
(a) The mass flow rates of the steam and cooling water, each in lbm/hr.
(b) The net power developed by the gas turbine and the vapor power cycles, in Btu/hr.
(c) The thermal efficiency of the combined cycle.
A turbojet engine is designed for cruise conditions of 600mi/hr at an altitude of 10000 meters where the ambient temperature and pressure are -50 C and 26.5 kPa, respectively. The turbojet operates at a turbine inlet temperature (T3) of 867 C and a n..
draw schematics of a heat engine and b refrigeration devices. label the reservoirs the type of energy transfer and the
determine the angle of twist of the end B of the solid section relative to end C. The tubes have an outer diameter of 30 mm and an inner diameter of 20 mm. The solid section has a diameter of 40 mm.
a thin metal plate is insulated on the back and exposed to solar radiation on the front surface. the exposed surface of
a pot full of water 4l is to be placed on a stove until it boils. the stove element puts 2500w into the water in the
The hydraulic cylinder BD exerts on member ABC a force P directed along line BD. Knowing that P must have a 750-N component perpendicular to member ABC, determine (a) the magnitude of the force P, (b) its component parallel to ABC.
water and ammonia streams flow through a steady state heat exchanger. the water stream enters the heat exchanger with a
measurements of drag force are made on a model automobile in a towing tank filled with fresh water. the model length is
water at 20 bar 400oc enters a turbine operating at steady state and exits at 1.5 bar. stray heat transfer and kinetic
a 12-in radius cylinder of weight 16-lb. rests on a 6 lb carriage. the system is at rest when a force p of magnitude
what four processes make up the ideal otto cycle? what is happening in an actual engine during the real processes that
A steam turbine is operated ith an input temp of 800C and exhaust temp of 150C. What is the maximum amount of work the turbine can do for a given heat input Q? Under what conditions is the maximum achieved?
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