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

T-S diagram (water)

P-h Diagram (water)

P-h Diagram for R22 http://www.swep.net/refrigerant-handbook/appendix/appendix-b/

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

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

Swimming pool energy and mass balance

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)

Heat recovery

Process in AHUs Example AHUs for swimming pools MENERGA ThermoCond 19

Swimming pool heating

Dehumidification using outside air in Winter and Summer

More advance control MENERGA ThermoCond 29

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

Recirculation of air with dehumidification catalog