Under the conditions of compressor frequency 70 Hz, relative
humidity 49.2%, air dry-bulb temperature 34.4 C and evaporator
water inlet temperature 12.5 C. The variation of cooling
capacity and COP with the spray water rate and air velocity is
plotted in Figs. 8 and 9.
As seen in the Figs. 8 and 9, when the air velocity is
3.0 m s1 and the spray water rate is increased from 0.03 to
0.05 kg m1 s, the cooling capacity and COP is increased from
48.58 to 52.91 kW and 4.46 to 4.73, respectively. The main
reason is that the cooling water wetted the condensing coils
preferably with increasing of spray water rate from 0.03 to
0.05 kgm1 s, and the vaporized water vapor is also increased.
Therefore, the higher heat and mass transfer coefficients
would be increased due to the higher spray rate. Furthermore,
the temperature difference between cooling water and