**Title: Calculating Ventilation Requirements for Residential Buildings****Introduction to Fresh Air Requirements**The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 62 from 1989 states that the minimum fresh air requirement for a residential building is 0.35 air changes per hour. This means 35 percent of the entire air contained in a residence should be replaced with fresh outdoor air every hour.**Problem Scenario**If the ventilation requirement of a 2.7-meter-high, 200-square-meter residence is to be met entirely by a fan, the following calculations are necessary:1. **Flow Capacity Determination**: Calculate the flow capacity in liters per minute (L/min) of the fan that needs to be installed.2. **Duct Diameter**: Determine the minimum diameter of the duct if the average air velocity is not to exceed 5 meters per second (m/s).**Detailed Explanation**To solve for the flow capacity and duct diameter, it's essential to know the volume of air that needs to be exchanged. - **Volume Calculation**: Calculate the total volume of the building by multiplying the area (200 m²) by the height (2.7 m).- **Air Exchange Rate**: Use the air change rate (0.35 air changes per hour) to find the volume of air that must be refreshed per hour.- **Convert to L/min**: Convert the flow from cubic meters per hour to liters per minute for the fan capacity.- **Duct Sizing**: Use the flow capacity and limit the velocity to 5 m/s to find the minimum duct diameter. Use appropriate formulas for duct flow calculations.Through these calculations, homeowners and engineers can ensure that ventilation systems meet required standards, promoting air quality and health within residential environments.

Given: Area, A = 200 m2 Height, h = 2.7 m air = 0.35 Velocity, v = 5 m/s To find: The flow capacity…

solutions together with parametric studies are included on the text website. Problems with the icon are comprehensive in nature and are intended to be solved with an equation solver such as EES. 5-14 The minimum fresh air requirement of a residen- tial building is specified to be 0.35 air changes per hour (ASHRAE, Standard 62, 1989). That is, 35 percent of the entire air contained in a residence should be replaced by fresh outdoor air every hour. If the ventilation requirement of a 2.7-m-high, 200-m² residence is to be met entirely by a fan, determine the flow capacity in L/min of the fan that needs to be installed. Also determine the minimum diameter of the duct if the average air velocity is not to exceed 5 m/s. 231 location, wind is blowing steadily the mechanical energy of air per unit ma generation potential of a wind turbine w blades at that location. Also determine tric power generation assuming an overall e 30 percent. Take the air density to be 1.25 kg/m²

solutions together with parametric studies are included on the text website. Problems with the icon are comprehensive in nature and are intended to be solved with an equation solver such as EES. 5-14 The minimum fresh air requirement of a residen- tial building is specified to be 0.35 air changes per hour (ASHRAE, Standard 62, 1989). That is, 35 percent of the entire air contained in a residence should be replaced by fresh outdoor air every hour. If the ventilation requirement of a 2.7-m-high, 200-m² residence is to be met entirely by a fan, determine the flow capacity in L/min of the fan that needs to be installed. Also determine the minimum diameter of the duct if the average air velocity is not to exceed 5 m/s. 231 location, wind is blowing steadily the mechanical energy of air per unit ma generation potential of a wind turbine w blades at that location. Also determine tric power generation assuming an overall e 30 percent. Take the air density to be 1.25 kg/m²

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

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Chapter2: Loads On Structures

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Problem 1P

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Question

**Title: Calculating Ventilation Requirements for Residential Buildings**

**Introduction to Fresh Air Requirements**

The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 62 from 1989 states that the minimum fresh air requirement for a residential building is 0.35 air changes per hour. This means 35 percent of the entire air contained in a residence should be replaced with fresh outdoor air every hour.

**Problem Scenario**

If the ventilation requirement of a 2.7-meter-high, 200-square-meter residence is to be met entirely by a fan, the following calculations are necessary:

1. **Flow Capacity Determination**: Calculate the flow capacity in liters per minute (L/min) of the fan that needs to be installed.

2. **Duct Diameter**: Determine the minimum diameter of the duct if the average air velocity is not to exceed 5 meters per second (m/s).

**Detailed Explanation**

To solve for the flow capacity and duct diameter, it's essential to know the volume of air that needs to be exchanged.

- **Volume Calculation**: Calculate the total volume of the building by multiplying the area (200 m²) by the height (2.7 m).

- **Air Exchange Rate**: Use the air change rate (0.35 air changes per hour) to find the volume of air that must be refreshed per hour.

- **Convert to L/min**: Convert the flow from cubic meters per hour to liters per minute for the fan capacity.

- **Duct Sizing**: Use the flow capacity and limit the velocity to 5 m/s to find the minimum duct diameter. Use appropriate formulas for duct flow calculations.

Through these calculations, homeowners and engineers can ensure that ventilation systems meet required standards, promoting air quality and health within residential environments.

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