Chapter 7, Problem 7.5DOEP

Mechanical EngineeringThermodynamicsTopic: Refrigeration Cycles

Discuss the difference between a heat engine and a refrigerating machine. Also explain in detail components, schematic diagram and computation of efficient of a basic refrigeration system.

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REFRIGERATION ENGINEERING (!) USE SHAPIRO AND MORAN TABLE

3. Generate the SFEE equations for the following process equipment with neat diagrams: 1. Air Compressor 2. Boiler 3. Shell & Tube Heat Exchanger 4. Evaporator 5. Condenser 6. Cooling Tower

Refrigerators and air conditioning systems perform the same function of maintaining cool or cold conditions in an environment. However, refrigerators are place inside while air conditioners are usually placed outside because   Question 13 options:   refrigerators function better when in a small enclosed space.   air conditioners need to release heat to the outside.   air conditioners need to use air from the outside to function.   refrigerators need to be placed in an environment of constant temperature and pressure.

The figure-of-merit indicating the quality of a refrigeration unit is usually the coefficient of performance   COP ≡ heat absorbed/net work put in   What is the COP for this magnetic refrigeration device?   (use wnet = 100 J/mol)

Use ashrae table and charts for reference state