Water is the working fluid in a cogeneration cycle that generates electricity and provides heat for campus buildings. Steam at 4 MPa, 400 °C, enters a two-stage turbine with a mass flow rate of 0.80 kg/s, from which a of 0.15 kg/s is extracted between the two stages at 0.20 MPa to provide for building heating, and the remainder expands through the second stage to the condenser pressure of 0.01 MPa. Condensate returns from the campus buildings and passes through a trap into the condenser, where it is reunited with the main feedwater flow. Saturated liquid leaves the condenser at 0.01MPa. Both turbine and pump have 90% efficiency. Determine, in kW, the ff. (a) rate of heat transfer to the working fluid passing through the steam generator; (b) rate of heat transfer for building heating; and (d) % utilization factor.
Water is the working fluid in a cogeneration cycle that generates electricity and provides heat for campus buildings. Steam at 4 MPa, 400 °C, enters a two-stage turbine with a mass flow rate of 0.80 kg/s, from which a of 0.15 kg/s is extracted between the two stages at 0.20 MPa to provide for building heating, and the remainder expands through the second stage to the condenser pressure of 0.01 MPa. Condensate returns from the campus buildings and passes through a trap into the condenser, where it is reunited with the main feedwater flow. Saturated liquid leaves the condenser at 0.01MPa. Both turbine and pump have 90% efficiency. Determine, in kW, the ff. (a) rate of heat transfer to the working fluid passing through the steam generator; (b) rate of heat transfer for building heating; and (d) % utilization factor.
Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN:9781133612315
Author:Jack Erjavec, Rob Thompson
Publisher:Jack Erjavec, Rob Thompson
Chapter3: Basic Theories And Math
Section: Chapter Questions
Problem 9RQ: Describe the effect of pressure on an enclosed volume of a gas.
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Question
2.2
Transcribed Image Text:Instruction:
a. Draw a schematic diagram of each problem with labels of states of a substance;
b. For uniformity purposes, assign STATE 1 at the inlet of a high-pressure turbine. The states must be
arranged in a chronological order;
c. Plot each cycle in a t-s diagram with the states consistent to the states assignment in the schematic
diagram;
d. Show a detailed solution of each problem.
2. Water is the working fluid in a cogeneration cycle that generates electricity and provides heat for
campus buildings. Steam at 4 MPa, 400 °C, enters a two-stage turbine with a mass flow rate of 0.80
kg/s, from which a of 0.15 kg/s is extracted between the two stages at 0.20 MPa to provide for building
heating, and the remainder expands through the second stage to the condenser pressure of 0.01 MPa.
Condensate returns from the campus buildings and passes through a trap into the condenser, where it
is reunited with the main feedwater flow. Saturated liquid leaves the condenser at 0.01MPa. Both
turbine and pump have 90% efficiency. Determine, in kW, the ff:
(a) rate of heat transfer to the working fluid passing through the steam generator;
(b) rate of heat transfer for building heating; and
(d) % utilization factor.
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