Windows and Energy Efficiency Quiz

Which of the following is the correct definition of dew point?

The temperature at which water vapor becomes solid
The temperature at which water vapor begins to condense (correct)
The temperature at which water vapor completely evaporates
The temperature at which water vapor reaches its maximum saturation

What is the purpose of a psychrometric chart?

To determine the conditions at which an assembly will fail
To understand the relationship between temperature, humidity, and other properties of air (correct)
To measure the moisture buffer capacity of materials
To select a vapor barrier

What is the unit of measurement used to characterize the water vapor permeance of materials?

Inch of mercury
Perm (correct)
Grain
Square foot

Which of the following statements is true about adsorption?

It refers to the moisture sticking on the surface of the material (A) Signup and view all the answers

What drives diffusive moisture transport?

Difference in Absolute Humidity (B) Signup and view all the answers

What drives evaporation?

Difference in Relative Humidity (C) Signup and view all the answers

What is the purpose of a vapor barrier?

To keep the water out (C) Signup and view all the answers

What happens when moisture doesn't dry out?

It accumulates on impermeable surfaces (D) Signup and view all the answers

What is the capacity of a material to store moisture called?

Moisture buffer capacity (B) Signup and view all the answers

What is the definition of a perm?

One grain of water vapor per hour per square foot per inch of mercury (B) Signup and view all the answers

Which of the following is NOT one of the properties used to describe windows?

SEF (D) Signup and view all the answers

What are the main contributors to reducing the Solar Heat Gain Coefficient (SHGC)?

Shading devices (C) Signup and view all the answers

What is the formula for calculating the Projection Factor (PF) for vertical fins and overhangs?

PF = SHGC / U-value (B) Signup and view all the answers

What is the formula for calculating the adjusted SHGC after calculating the shading equivalent factor (SEF)?

Adjusted SHGC = SHGC x SEF (A) Signup and view all the answers

What does WWR stand for in the context of windows?

Window-Wall Ratio (C) Signup and view all the answers

What is the definition of Visual Light Transmission (VLT)?

An optical property of a light transmitting material (D) Signup and view all the answers

What is a thermal bridge?

A section where heat flow is different/facilitated (C) Signup and view all the answers

What is the formula for calculating the Solar Heat Gain Coefficient (SHGC)?

SHGC = ER + EA + ET (C) Signup and view all the answers

What is the formula for calculating the total heat gain of a window?

Total Heat Gain = SHGC x Solar Radiation Energy (B) Signup and view all the answers

What are the two main processes that occur when the water phase is changing?

Melting and freezing (C) Signup and view all the answers

Which one of these is true about phase change?

Phase change occurs when a substance gains or loses enough sensible energy to reach the phase change point and then gains or loses enough latent energy to change its phase (B) Signup and view all the answers

Which one of these is true about moisture transport?

Moisture transport can occur through diffusion, capillary action, osmosis, and gravity (D) Signup and view all the answers

Which one of these is true about reading a Psychrometric Chart?

A Psychrometric Chart is used to determine the properties of moist air, such as temperature, humidity, and enthalpy (A) Signup and view all the answers

Which one of these is true about the phase change of water at 0°C (32°F) and 1 atm pressure?

At this temperature and pressure, water is undergoing phase change and is in a state between solid and liquid (A) Signup and view all the answers

Which one of these is true about the phase change of water at 100°C (212°F) and 1 atm pressure?

At this temperature and pressure, water is undergoing phase change and is in a state between liquid and gas (D) Signup and view all the answers

Which of the following is true about phase change?

Phase change occurs when a substance gains or loses enough sensible energy to reach the phase change point and then gains or loses enough latent energy to change its phase. (B) Signup and view all the answers

Which of the following describes the process of moisture transport through diffusion?

Movement from a region of higher humidity concentration to lower concentration of humidity. (A) Signup and view all the answers

Which of the following is true about capillary action?

Water in a narrow space has the capability to 'climb' and capillary action is more common than designers think. (C) Signup and view all the answers

Which of the following is true about osmosis?

Osmosis is a problem prevalent in areas where groundwater has a high concentration of salt in it. (A) Signup and view all the answers

Which of the following is the correct formula for calculating the relative humidity in the air?

Relative Humidity(%) = (How Much Vapor in the Air) / (How Much Vapor the Air Can Hold) x 100 (B) Signup and view all the answers

Which of the following is the correct formula for calculating the absolute humidity in the air?

Absolute Humidity (g/m^3) = (Mass of Water Vapor in the Air) / (Volume of Air) (B) Signup and view all the answers

Which of the following is true about reading a psychrometric chart?

A psychrometric chart is used to determine properties of air such as temperature, humidity, and enthalpy. (A) Signup and view all the answers

Which of the following is true about sensible energy and latent energy?

Sensible energy is the energy received that raises the temperature of the substance, while latent energy is the energy received that the substance uses to change phase. (C) Signup and view all the answers

Which of the following is true about moisture transport through gravity?

Gravity can move moisture when possible, but it is not a significant contributor to moisture transport. (C) Signup and view all the answers