1. Lecture Objectives: Learn about advanced cooling cycles
Look at HW2 problems
Discuss heat recovery systems
Swimming pool example

2. T-S diagram (water)

3. P-h Diagram (water)

4. P-h Diagram for R22

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

6. Heat pump example A recreation center Heat Pump Ice Rink Swimming pool
Condenser
Evaporator
85-89oF
30oF
Consumes heat energy
Rejects heat energy
Electric power
for a compressor

7. Swimming pool energy and mass balance

8. Evaporation Heat loss by evaporation: hm ≈ Ws Wair
Tpool
Tair
pool
W s W ≈ hm Ws
Tpool
Wair
pool
Depends on the air speed and even
more on the condition of the water surface
(people splashing in the water)

9. Heat recovery

10. Process in AHUs
Example AHUs for swimming pools
MENERGA ThermoCond 19

11. Swimming pool heating

12. Dehumidification using outside air in Winter and Summer

13. More advance control
MENERGA
ThermoCond 29

14. Dehumidification using outside air in winter
Condenser in the air stream
Evaporator
Compressor of
the heat pump
Condenser in the swimming pool

15. Recirculation of air with dehumidification
catalog