Question 5 - Section B: The mean air temperature outside a theatre hall is 32 °C. Indoor air is maintained at 18 °C. The variable air volume (VAV) ventilation system that ventilates this hall has a cooling load of 28.6 kW. There are 86 people in the theatre and each person produces carbon dioxide (CO2) at a rate of 0.0402 m³ per hour. The theatre hall is 26 m long, 14 m wide and 3.2 m high. The allowable maximum CO2 concentration in the hall is 1150 ppm. Outdoor air CO2 concentration is 520 ppm. For the air, take density, p as 1.184 kg/m³, and the specific heat capacity of air at constant pressure, Cp is 1005 J/kg.K. Determine: (iv) the minimum outdoor air supply volume flow rate required to maintain the indoor CO2 level at or below the specified level. (v) the refresh rate (in number of air changes per hour) required. (vi) the mass flow rate of air from the VAV system to maintain the required indoor air temperature at the specified cooling load.
Question 5 - Section B: The mean air temperature outside a theatre hall is 32 °C. Indoor air is maintained at 18 °C. The variable air volume (VAV) ventilation system that ventilates this hall has a cooling load of 28.6 kW. There are 86 people in the theatre and each person produces carbon dioxide (CO2) at a rate of 0.0402 m³ per hour. The theatre hall is 26 m long, 14 m wide and 3.2 m high. The allowable maximum CO2 concentration in the hall is 1150 ppm. Outdoor air CO2 concentration is 520 ppm. For the air, take density, p as 1.184 kg/m³, and the specific heat capacity of air at constant pressure, Cp is 1005 J/kg.K. Determine: (iv) the minimum outdoor air supply volume flow rate required to maintain the indoor CO2 level at or below the specified level. (v) the refresh rate (in number of air changes per hour) required. (vi) the mass flow rate of air from the VAV system to maintain the required indoor air temperature at the specified cooling load.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Transcribed Image Text:Question 5 - Section B:
The mean air temperature outside a theatre hall is 32 °C. Indoor air is maintained at 18 °C. The
variable air volume (VAV) ventilation system that ventilates this hall has a cooling load of 28.6 kW.
There are 86 people in the theatre and each person produces carbon dioxide (CO2) at a rate of
0.0402 m³ per hour. The theatre hall is 26 m long, 14 m wide and 3.2 m high. The allowable
maximum CO2 concentration in the hall is 1150 ppm. Outdoor air CO2 concentration is 520 ppm.
For the air, take density, p as 1.184 kg/m³, and the specific heat capacity of air at constant
pressure, Cp is 1005 J/kg.K.
Determine:
(iv) the minimum outdoor air supply volume flow rate required to maintain the indoor CO2 level at
or below the specified level.
(v) the refresh rate (in number of air changes per hour) required.
(vi) the mass flow rate of air from the VAV system to maintain the required indoor air temperature
at the specified cooling load.
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