10:28Q6: Consider a 3 bedroom apartment with 3roommates. The apartment has a volume of11,742 m^3 with 3 meter ceilings. If theapartment was ventilated according to therequirements of ASHRAE 62.2, what wouldthe CO2 concentration be inside the housewhen all the roommates are home? Assumethe outdoor concentration is 400ppm, theCO2 generation rate is .005 L/SCO2/person,and 100% outdoor air is used with norecirculation. Determining Whole-Building Ventilation Rates for Residential BuildingsWhole-building ventilation replaces an amount of stale, indoor air with ventilation from the outdoors. It isintended to dilute indoor pollutants and provide acceptable air quality. ASHRAE Standard 62.2, Ventilation andAcceptable Air Quality in Low-Rise Residential Buildings, defines the roles and minimum requirements formechanical systems, natural ventilation systems, and building envelopes intended to provide acceptableindoor air quality (IAQ) in residential buildings. We will use the following formula from ASHRAE Standard 62.2to calculate the total required ventilation rate:Q = 0.15Afloor + 3.5 (Núr + 1)Where:Q is the total required ventilation rate (L/s)A floor is the dwelling-unit floor area (m2)Nbrisnumofedrooms (not toless than 1)Once we know the ventilation rate in a space of a given volume, we can also calculate the steady-state CO2concentration using the following formula:GNKCinCout +Where:Cin is the indoor steady state concentration of C02, expressed as parts per million, or ppm(dimensionless)Cout is the outdoor concentration of CO2 that is in the fresh air from outdoors, expressed as parts permillion, or ppm (dimensionless)G is the generation rate of CO2 per occupant (L/s of CO2/ person)N is the number of occupants (people)O is the total ventilation rate (L/s)K is a constant to introduce units of ppm (K is equal to 1,000,000)

Solution: Given: Number of Bedroom = 3 Roommates = 3 Volume of apartment = 11742 m3 Ceiling Height =…

Q6: Consider a 3 bedroom apartment with 3 roommates. The apartment has a volume of 11,742 m^3 with 3 meter ceilings. If the apartment was ventilated according to the requirements of ASHRAE 62.2, what would the CO2 concentration be inside the house when all the roommates are home? Assume the outdoor concentration is 400ppm, the CO2 generation rate is .005 L/SCO2/person, and 100% outdoor air is used with no recirculation.

Q6: Consider a 3 bedroom apartment with 3 roommates. The apartment has a volume of 11,742 m^3 with 3 meter ceilings. If the apartment was ventilated according to the requirements of ASHRAE 62.2, what would the CO2 concentration be inside the house when all the roommates are home? Assume the outdoor concentration is 400ppm, the CO2 generation rate is .005 L/SCO2/person, and 100% outdoor air is used with no recirculation.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

10:28
Q6: Consider a 3 bedroom apartment with 3
roommates. The apartment has a volume of
11,742 m^3 with 3 meter ceilings. If the
apartment was ventilated according to the
requirements of ASHRAE 62.2, what would
the CO2 concentration be inside the house
when all the roommates are home? Assume
the outdoor concentration is 400ppm, the
CO2 generation rate is .005 L/SCO2/person,
and 100% outdoor air is used with no
recirculation.

Determining Whole-Building Ventilation Rates for Residential Buildings
Whole-building ventilation replaces an amount of stale, indoor air with ventilation from the outdoors. It is
intended to dilute indoor pollutants and provide acceptable air quality. ASHRAE Standard 62.2, Ventilation and
Acceptable Air Quality in Low-Rise Residential Buildings, defines the roles and minimum requirements for
mechanical systems, natural ventilation systems, and building envelopes intended to provide acceptable
indoor air quality (IAQ) in residential buildings. We will use the following formula from ASHRAE Standard 62.2
to calculate the total required ventilation rate:
Q = 0.15Afloor + 3.5 (Núr + 1)
Where:
Q is the total required ventilation rate (L/s)
A floor is the dwelling-unit floor area (m2)
Nbris
num
of
edrooms (not to
less than 1)
Once we know the ventilation rate in a space of a given volume, we can also calculate the steady-state CO2
concentration using the following formula:
GNK
Cin
Cout +
Where:
Cin is the indoor steady state concentration of C02, expressed as parts per million, or ppm
(dimensionless)
Cout is the outdoor concentration of CO2 that is in the fresh air from outdoors, expressed as parts per
million, or ppm (dimensionless)
G is the generation rate of CO2 per occupant (L/s of CO2/ person)
N is the number of occupants (people)
O is the total ventilation rate (L/s)
K is a constant to introduce units of ppm (K is equal to 1,000,000)

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