9. A large warehouse located at an altitude of 1500 m has to be maintained at a DBT of 270C and a relative humidity of 50% using a direct evaporative cooling system. The outdoor conditions are 330C (DBT) and 150C (WBT). The cooling load on the warehouse is 352 kW. A supply fan located in the downstream of the evaporative cooler adds 15 kW of heat. Find the required mass flow rate of air. Assume the process in evaporative cooler to follow a constant WBT.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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9. A large warehouse located at an altitude of 1500 m has to be maintained at a
DBT of 270C and a relative humidity of 50% using a direct evaporative cooling
system. The outdoor conditions are 330C (DBT) and 150C (WBT). The cooling
load on the warehouse is 352 kW. A supply fan located in the downstream of the
evaporative cooler adds 15 kW of heat. Find the required mass flow rate of air.
Assume the process in evaporative cooler to follow a constant WBT.
10. A winter air conditioning system maintains a building at 210C and 40% RH.
The outdoor conditions are OoC (DBT) and 100% RH. The sensible load load on
the building is 100 kW, while the latent heating load is 25 kW. In the air
conditioning system, 50% of the outdoor air (by mass) is mixed with 50% of the
room air. The mixed air is heated in a pre-heater to 250C and then required
amount of dry saturated steam at 1 atm. pressure is added to the pre-heated air
in a humidifier. The humidified air is then heated to supply temperature of 450C
and is then supplied to the room. Find a) The required mass flow rate of supply
air, b) Required amount of steam to be added, and c) Required heat input in
pre-heater and re-heater. Barometric pressure = 1atm..
%3D
Transcribed Image Text:9. A large warehouse located at an altitude of 1500 m has to be maintained at a DBT of 270C and a relative humidity of 50% using a direct evaporative cooling system. The outdoor conditions are 330C (DBT) and 150C (WBT). The cooling load on the warehouse is 352 kW. A supply fan located in the downstream of the evaporative cooler adds 15 kW of heat. Find the required mass flow rate of air. Assume the process in evaporative cooler to follow a constant WBT. 10. A winter air conditioning system maintains a building at 210C and 40% RH. The outdoor conditions are OoC (DBT) and 100% RH. The sensible load load on the building is 100 kW, while the latent heating load is 25 kW. In the air conditioning system, 50% of the outdoor air (by mass) is mixed with 50% of the room air. The mixed air is heated in a pre-heater to 250C and then required amount of dry saturated steam at 1 atm. pressure is added to the pre-heated air in a humidifier. The humidified air is then heated to supply temperature of 450C and is then supplied to the room. Find a) The required mass flow rate of supply air, b) Required amount of steam to be added, and c) Required heat input in pre-heater and re-heater. Barometric pressure = 1atm.. %3D
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