4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at...
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4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at 27°C) 10,000 kcal per hour. If the temperature inside the unit must be kept at -50°C, what is the power of the unit's engine (recall that power is P = W/t)? A Carnot engine is an idealized, reversible engine. In real life, it is found that you need to use an engine capable of producing 5.50 kW to run this unit. Express the efficiency of this engine as a percent of the efficiency of the Carnot engine (e.g. a possible answer would be "the engine has 65% the performance of a Carnot engine"). Note, for refrigerators, we use the coefficient of performance, c, which is a concept equivalent to the efficiency of the Carnot engine. It is given by the ratio of the heat extracted from the cold source, qc. and the work done on the system: c= [qc/w] =T/(TH-Tc). c can be significantly larger than 1. 4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at 27°C) 10,000 kcal per hour. If the temperature inside the unit must be kept at -50°C, what is the power of the unit's engine (recall that power is P = W/t)? A Carnot engine is an idealized, reversible engine. In real life, it is found that you need to use an engine capable of producing 5.50 kW to run this unit. Express the efficiency of this engine as a percent of the efficiency of the Carnot engine (e.g. a possible answer would be "the engine has 65% the performance of a Carnot engine"). Note, for refrigerators, we use the coefficient of performance, c, which is a concept equivalent to the efficiency of the Carnot engine. It is given by the ratio of the heat extracted from the cold source, qc. and the work done on the system: c= [qc/w] =T/(TH-Tc). c can be significantly larger than 1.
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27C 10000 kcal hr 1163 win win 116372 223 50C 223 300223 2 since 10000k lod hr is being tr... View the full answer
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
Posted Date:
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