Lecture Objectives: Look at the cooling side of air condition

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Presentation transcript:

Lecture Objectives: Look at the cooling side of air condition solve some problems related to the cooling system efficiency

Cooling Cycle (we discussed this but we need some numerical examples) We need: COP = (h3-h2)/(h4-h3)

T-S diagram (water)

P-h Diagram (water)

P-h Diagram for R22

Example A) Calculate the COP when: ambient temperature is 30ºC Cooling coil (CC) is 10ºC Assume that : condensation is 10ºC above ambient temperature and evaporation is 10ºC below CC temperature B) How much electricity you need to provide 1 ton of cooling ?

HW2 Textbook problems 3.2, 3.5, 3.9, 3.10 Due: February 16