stem that maintains 250C dry bulb and 50 % RH inside, when the outside conditions are 340C dry bulb and 40% RH. The room sensible and latent heat gains are 60 kW and 12 kW respectively. As shown in the figure below, The putside fresh air first flows over a first cooler coil and is reduced to state 1 of 100C dry pulb and a relative humidity of 85%. It is then mixed with recirculated air, the mixture state 2) being handled by a fan, passed over a second cooler coil and sensibly cooled to 20C dry bulb (state 3). The air is then delivered to the room. If the outside fresh air is

Elements Of Electromagnetics
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5. A room is air conditioned by a system that maintains 250C dry bulb and 50 % RH inside,
when the outside conditions are 340C dry bulb and 40% RH. The room sensible and
latent heat gains are 60 kW and 12 kW respectively. As shown in the figure below, The
outside fresh air first flows over a first cooler coil and is reduced to state 1 of 100C dry
bulb and a relative humidity of 85%. It is then mixed with recirculated air, the mixture
(state 2) being handled by a fan, passed over a second cooler coil and sensibly cooled to
120C dry bulb (state 3). The air is then delivered to the room. If the outside fresh air is
used for dealing with the whole of the room latent heat gain and if the effects of fan
power and duct heat gains are ignored, find: a) mass flow rates of outside fresh air and
supply air; b) DBT and enthalpy of the air handled by the fan (state 2); and c) required
cooling capacity of first cooler coil and second sensible cooler coil.
Transcribed Image Text:5. A room is air conditioned by a system that maintains 250C dry bulb and 50 % RH inside, when the outside conditions are 340C dry bulb and 40% RH. The room sensible and latent heat gains are 60 kW and 12 kW respectively. As shown in the figure below, The outside fresh air first flows over a first cooler coil and is reduced to state 1 of 100C dry bulb and a relative humidity of 85%. It is then mixed with recirculated air, the mixture (state 2) being handled by a fan, passed over a second cooler coil and sensibly cooled to 120C dry bulb (state 3). The air is then delivered to the room. If the outside fresh air is used for dealing with the whole of the room latent heat gain and if the effects of fan power and duct heat gains are ignored, find: a) mass flow rates of outside fresh air and supply air; b) DBT and enthalpy of the air handled by the fan (state 2); and c) required cooling capacity of first cooler coil and second sensible cooler coil.
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