Building Air Movement and Pressure Distribution Quiz

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Questions and Answers

Which factors influence the distribution of pressure on a building's surface due to air movement?

The age of the building
The type of insulation used in the building
The color of the building’s exterior
The shape of the building and wind characteristics (correct)

What is the primary purpose of conducting a blower-door test in a building?

To assess the energy consumption of the building
To measure the air infiltration rate of the building (correct)
To determine the thermal insulation properties
To evaluate the structural integrity of walls

In airflow measurement, what does the term 'infiltration' refer to?

Ventilation provided through mechanical means
The process of air conditioning a space
Uncontrolled air entering a building from cracks and openings (correct)
Controlled air entering and exiting a building

Which equation correctly expresses the intensity of wind pressure on a building?

$p = 0.5 \cdot C_d \cdot \rho \cdot V^2$ (D) Signup and view all the answers

What characteristic of a building is often assessed to determine air leakage performance?

The classification of cracks and openings present (C) Signup and view all the answers

What does the pressure coefficient (Cp) signify in the context of wind pressure on buildings?

The shape and lift produced by the building's design (D) Signup and view all the answers

In the context of heat and mass transfer, why is understanding air movement essential?

It impacts the overall temperature of the building (A) Signup and view all the answers

Which of the following factors does NOT impact the wind pressure intensity acting on a building?

Type of landscaping around the building (B) Signup and view all the answers

What is primarily measured during a blower-door test?

Total air leakage rate of the building (B) Signup and view all the answers

Which metric is commonly used to express the level of air infiltration in buildings?

Air changes per hour (ACH) (C) Signup and view all the answers

What role does air movement play in heat and mass transfer in buildings?

It enhances uniform distribution of temperature. (D) Signup and view all the answers

In the context of air infiltrations, what does the term 'exfiltration' refer to?

The escape of indoor air to the outside (C) Signup and view all the answers

Which technique is vital for accurately measuring airflow due to infiltrations?

Pressure differential measurement (B) Signup and view all the answers

Which component of the building envelope significantly affects air leakage?

Window frames (C) Signup and view all the answers

What is the primary purpose of conducting a measurement of airflow due to infiltrations?

To identify potential areas for improving energy efficiency (D) Signup and view all the answers

Which factor primarily drives air infiltration in buildings?

Pressure differences between inside and outside environments (C) Signup and view all the answers

Which factor primarily contributes to air infiltration in buildings?

Cracks and openings in the building envelope (D) Signup and view all the answers

What is the primary purpose of conducting a blower-door test?

To quantify air leakage in a building (A) Signup and view all the answers

Which airflow measurement technique is commonly used to determine air infiltration rates?

Tracer gas dilution method (B) Signup and view all the answers

In the context of building envelope performance, what does the term ‘air leakage’ refer to?

Uncontrolled air movement through cracks and openings (A) Signup and view all the answers

Which principle is primarily involved in the transfer of heat through a building envelope?

Conductive heat transfer (C) Signup and view all the answers

What is the significance of measuring airflow due to infiltrations?

To improve the comfort conditions inside buildings (B) Signup and view all the answers

How do cracks and openings in a building affect indoor environmental quality?

They can lead to drafts and temperature fluctuations (D) Signup and view all the answers

Which of the following factors does NOT influence the heat and mass transfer in buildings?

Volume of furnishings in a room (B) Signup and view all the answers

Flashcards

Air infiltration in buildings

The unwanted flow of air into or out of a building through cracks, gaps, or openings.

Air leakage characteristics

The properties of cracks, gaps, and openings that affect how much air leaks into or out of a building.