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

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

3. T-S diagram (water)

4. P-h Diagram (water)

5. P-h Diagram for R22

6. 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 ?

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