The figure below shows a vapor power cycle that provides process heat and produces power. The steam generator produces vapor at 500 lbf/in.2, 800°F, at a rate of 8 x 104 lb/h. Fifty-two percent of the steam expands through the turbine to 10 lbf/in.2 and the remainder is directed to the heat exchanger. Saturated liquid exits the heat exchanger at 500 lbf/in.2 and passes through a trap before entering the condenser at 10 lbf/in.2 Saturated liquid exits the condenser at 10 lbf/in.2 and is pumped to 500 lbf/in.2 before entering the steam generator. The turbine and pump have isentropic efficiencies of 85% and 89%, respectively. For the process heat exchanger, assume the temperature at which heat transfer occurs is 465°F. Let T0 = 60°F, p0 = 14.7 lbf/in.2 Determine: (a) the magnitude of the process heat production rate, in Btu/h. (b) the magnitude of the rate of exergy output, in Btu/h, as net work. (c) the rate of exergy transfer, in Btu/h, to the working fluid passing through the steam generator. (d) the magnitude of the rate of exergy output, in Btu/h, with the process heat. (e) the magnitude of the rate of exergy loss, in Btu/h, from the working fluid passing through the condenser. (f) the sum of the rate of exergy destrution, in Btu/h, in the turbine, process heat exchager, trap, and pump

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The figure below shows a vapor power cycle that provides process heat and produces power. The steam generator produces vapor at 500 lbf/in.², 800°F, at a rate of 8 x 10⁴ lb/h. Fifty-two percent of the steam expands through the turbine to 10 lbf/in.² and the remainder is directed to the heat exchanger. Saturated liquid exits the heat exchanger at 500 lbf/in.² and passes through a trap before entering the condenser at 10 lbf/in.²

Saturated liquid exits the condenser at 10 lbf/in.² and is pumped to 500 lbf/in.² before entering the steam generator. The turbine and pump have isentropic efficiencies of 85% and 89%, respectively. For the process heat exchanger, assume the temperature at which heat transfer occurs is 465°F. Let T₀ = 60°F, p₀ = 14.7 lbf/in.²

Determine:

(a) the magnitude of the process heat production rate, in Btu/h.

(b) the magnitude of the rate of exergy output, in Btu/h, as net work.

(c) the rate of exergy transfer, in Btu/h, to the working fluid passing through the steam generator.

(d) the magnitude of the rate of exergy output, in Btu/h, with the process heat.

(e) the magnitude of the rate of exergy loss, in Btu/h, from the working fluid passing through the condenser.

(f) the sum of the rate of exergy destrution, in Btu/h, in the turbine, process heat exchager, trap, and pump.

Pi = 500 lbf/in.?
T = 800°F
n = 85%
Steam
generator
(1– y)
Turbine
(y)
P2 = 10 lbf/in.?
Heat
process
-2
exchanger
P4 = 500 lbf/in.?
saturated liquid
- Qout
Condenser
Pump
3
P3 = 10 lbf/in.?
saturated liquid
7p = 89%
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