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Get Full Access to Fundamentals Of Engineering Thermodynamics - 8 Edition - Chapter 10 - Problem 10.30
Get Full Access to Fundamentals Of Engineering Thermodynamics - 8 Edition - Chapter 10 - Problem 10.30

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# Solved: Figure P10.30 shows a two-stage vapor-compression

ISBN: 9781118412930 139

## Solution for problem 10.30 Chapter 10

Fundamentals of Engineering Thermodynamics | 8th Edition

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Problem 10.30

Figure P10.30 shows a two-stage vapor-compression refrigeration system with ammonia as the working fluid. The system uses a direct-contact heat exchanger to achieve intercooling. The evaporator has a refrigerating capacity of 30 tons and produces 2208F saturated vapor at its exit. In the first compressor stage, the refrigerant is compressed adiabatically to 80 lbf/in.2 , which is the pressure in the direct contact heat exchanger. Saturated vapor at 80 lbf/in.2 enters the second compressor stage and is compressed adiabatically to 250 lbf/in.2 Each compressor stage has an isentropic efficiency of 85%. There are no significant pressure drops as the refrigerant passes through the heat exchangers. Saturated liquid enters each expansion valve. Determine (a) the ratio of mass flow rates, m # 3/m # 1. (b) the power input to each compressor stage, in horsepower. (c) the coefficient of performance.(d) Plot each of the quantities calculated in parts (a)(c)versus the direct-contact heat exchanger pressure rangingfrom 20 to 200 lbf/in.2 Discuss.

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Week 4: Film continued & Lecture  Laborers were only paid \$1/day for working from dawn to dusk  1920s-1930s: over 100,000 Filipinos immigrated to the US o the imagination of the laborers was that the USA was all about wealth – ironically, they arrived during the Great Depression  lived in camps  kids worked 10 hours/day and made 8cents/hour  didn’t have food to eat so ate animals like frogs or crows  verbal abuse – “Monkey, go home. Go where you belong”  California law – A Filipino cannot marry a White  Weekends – when they got paid, they went dancing  Rooster fighting  Very low ratio of men to women (16:1 or 32:1)  Life got better for the Filipinos around the 1970s-1980s o Some went back to their native

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