(i) Show how air washer can be used for year round air conditioning?
(ii) A spray cooling coil is used to operate under the following conditions: Air inlet 28° DBT/21°C WBT, Air outlet 10°C DBT /6°C WBT. Total air flow rate 2000 m3/min. Chilled water inlet and outlet temperatures are 7°C and 12°C. Find
(a) Cooling load on the coil
(b) Water flow rate through the coil.
Properties of moist air from psychometric chart are as follows :
|
DBT
oC
|
WBT
oC
|
Sp. humidity
gm / kg
|
Sp. vol.
m3 / kg
|
Enthalpy
kJ / kg
|
|
28
|
21.0
|
12.95
|
0.87
|
61.0
|
|
10
|
6.0
|
4.2
|
0.81
|
21.0
|