34 Questions
Which of the following is the correct definition of dew point?
The temperature at which water vapor begins to condense
What is the purpose of a psychrometric chart?
To understand the relationship between temperature, humidity, and other properties of air
What is the unit of measurement used to characterize the water vapor permeance of materials?
Perm
Which of the following statements is true about adsorption?
It refers to the moisture sticking on the surface of the material
What drives diffusive moisture transport?
Difference in Absolute Humidity
What drives evaporation?
Difference in Relative Humidity
What is the purpose of a vapor barrier?
To keep the water out
What happens when moisture doesn't dry out?
It accumulates on impermeable surfaces
What is the capacity of a material to store moisture called?
Moisture buffer capacity
What is the definition of a perm?
One grain of water vapor per hour per square foot per inch of mercury
Which of the following is NOT one of the properties used to describe windows?
SEF
What are the main contributors to reducing the Solar Heat Gain Coefficient (SHGC)?
Shading devices
What is the formula for calculating the Projection Factor (PF) for vertical fins and overhangs?
PF = SHGC / U-value
What is the formula for calculating the adjusted SHGC after calculating the shading equivalent factor (SEF)?
Adjusted SHGC = SHGC x SEF
What does WWR stand for in the context of windows?
Window-Wall Ratio
What is the definition of Visual Light Transmission (VLT)?
An optical property of a light transmitting material
What is a thermal bridge?
A section where heat flow is different/facilitated
What is the formula for calculating the Solar Heat Gain Coefficient (SHGC)?
SHGC = ER + EA + ET
What is the formula for calculating the total heat gain of a window?
Total Heat Gain = SHGC x Solar Radiation Energy
What are the two main processes that occur when the water phase is changing?
Melting and freezing
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
Which one of these is true about moisture transport?
Moisture transport can occur through diffusion, capillary action, osmosis, and gravity
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
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
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
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.
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.
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.
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.
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
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)
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.
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.
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.
Test your knowledge on properties of windows, calculating U-value and SHGC, the role of shading devices, and calculating Projection Factor PF and adjusted SHGC.
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