Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Instead, assume variable specific heat
A gas-turbine power plant operates on the simple
Brayton cycle between the pressure limits of 100 and 800 kPa.
Air enters the compressor at 308C and leaves at 3308C at a
mass flow rate of 200 kg/s. The maximum cycle temperature
is 1400 K. During operation of the cycle, the net power output
is measured experimentally to be 60 MW. Assume constant
properties for air at 300 K with cv 5 0.718 kJ/kg·K, cp 5
1.005 kJ/kg·K, R 5 0.287 kJ/kg·K, k 5 l.4.
(a) Sketch the T-s diagram for the cycle.
(b) Determine the isentropic efficiency of the turbine for
these operating conditions.
(c) Determine the cycle thermal efficiency.
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- A 12,000 MW gas turbine operating in the simple open cycle has an exhaust gas flow of 80 kg/s. The gas enters a wasteheat recovery boiler at 400°C and leaves at 130°C, specific heat of the gas is 0.85 kJ/kg - K, heat required to produce 1kg of steam at 4.5 MPa and 320°C from feedwater at 110°C is 3.5 kJ. A. Calculate the quantity of steam that can beproduced in kg/hr. B. If the steam produce from this waste heat recovery boiler is used to run a steam turbine-generator setwith a combined steam rate of 6.4 kg/kW-hr, what additional kW capacity can be obtained at no fuel cost?arrow_forwardConsider a simple Brayton cycle using air asthe working fluid; has a pressure ratio of 12; has amaximum cycle temperature of 600C; and operates thecompressor inlet at 100 kPa and 15C. Which will have the greatest impact on the back-work ratio: a compressorisentropic efficiency of 80 percent or a turbine isentropicefficiency of 80 percent? Use constant specific heats atroom temperature.arrow_forwardIn a Rankine Cycle, real work produced by the turbine is less that the isentropic work. True Falsearrow_forward
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