文档介绍：Thermal Energy Problem Set #7– Fall 2002
Time spent on problems:
Problem 1:
Problem 2:
Problem 3:
Problem 4:
Problem 5:
Thermal Energy Problem Set #7 – Fall 2002
Do all problems. Please use a separate sheet of paper for each problem.
1. A Carnot cycle, that uses water as two-phase working medium, is run in reverse as a
refrigeration cycle. Heat is rejected at a temperature of 25o C and the coefficient of
performance is 4.
(a) Sketch the Carnot refrigeration cycle in P-v and T-s diagrams.
(b) At what temperature is heat absorbed from the surroundings?
(c) What is the specific work required to run the Carnot refrigeration cycle?
2. Reynolds and Perkins, Engineering Thermodynamics, 2nd Ed. Problem , pp. 150
3. An experimental geothermal energy system in Baja, California consists of a hot water
well, a flasher-separator-collector, and a 10,000 kW Rankine engine. The pressurized
ground water at 150 bar, 280oC leaves the well, passes through a throttle and enters
the flash chamber that is maintained at 15 bar. The flashed vapor enters an ideal
turbine as saturated vapor at 15 bar; the turbine exhausts at 1 bar. The unflashed
water runs to waste. Find the hourly amount of ground water required for
continuous operation.
Pressurized Ground Water
P=150 b