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Unformatted text preview: , she reasons, the entropy of the
steam will decrease, the performance of the turbine will improve, and as a result the work output of the turbine will increase. How would you evaluate this proposal?
7–80C It is well known that the power consumed by a compressor can be reduced by cooling the gas during compression. cen54261_ch07.qxd 11/18/03 9:58 AM Page 339 339
CHAPTER 7 Inspired by this, somebody proposes to cool the liquid as it
flows through a pump, in order to reduce the power consumption of the pump. Would you support this proposal? Explain.
7–81 Water enters the pump of a steam power plant as saturated liquid at 20 kPa at a rate of 45 kg/s and exits at 6 MPa.
Neglecting the changes in kinetic and potential energies and
assuming the process to be reversible, determine the power
input to the pump.
7–82 Liquid water enters a 10-kW pump at 100-kPa pressure
at a rate of 5 kg/s. Determine the highest pressure the liquid
water can have at the exit of the pump. Neglect the kinetic and
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This document was uploaded on 11/28/2012.
- Spring '09