60 Questions
Which tool is considered the most handy for designers when reading a Psychrometric Chart?
Psychrometric Chart
What is the Dew Point for the given conditions of Outside (92 F) RH: 60%?
77 F
What is the moisture buffer capacity of a material called?
Adsorption
What unit of measurement is used to characterize the water vapor permeance of materials?
Perm
What does a good Vapor Barrier do?
Keep the Water Out
What drives diffusive moisture transport?
Difference in Absolute Humidity
What happens when moisture doesn't dry out?
Accumulates on surfaces
What is the ratio that drives evaporation?
Relative Humidity
What is the formula for calculating the amount of water vapor a material allows through over a period of time?
1 Perm = 1 grain of water vapor per hour per square foot per inch of mercury
Where should the vapor barrier be set to avoid condensation?
Towards the warmer side
Which of the following is NOT a property of windows mentioned in the text?
SEF
What is the formula for calculating the Projection Factor (PF) for vertical fins and overhangs?
PF = (Total Heat Gain) / (Glass Area)
What is the contribution of Solar Heat Gain Coefficient (SHGC) to the Total Heat Gain?
80%
What is the formula for calculating the Total Heat Gain?
Total Heat Gain = (SHGC contribution) + (U_value contribution)
What is the formula for calculating the U-value contribution to the Total Heat Gain?
U_value contribution = 20%
What are the three states (phases) in which water exists around us?
Solid, Liquid, Gas
What is the process called when the water phase changes from solid to liquid?
Melting
What is the process called when the water phase changes from liquid to gas?
Evaporation
Is water considered a form of mass transfer or energy transfer?
Mass transfer
Which of the following is NOT a property of water mentioned in the text?
Heat
Which of the following is NOT a process that can cause phase change in water?
Enthalpy
At what temperature does water boil at 1 atm pressure?
100°C
What is the phase of water at 0°C (32°F) and 1 atm pressure?
Solid
Which type of energy raises the temperature of a substance?
Sensible energy
What is the sum of sensible and latent energy called?
Enthalpy
Which process of moisture transport involves movement from a region of higher humidity concentration to lower concentration?
Diffusion
What is the ratio of the mass of moisture in the air over the mass of dry air called?
Absolute humidity
How is relative humidity affected by temperature?
It decreases with temperature
What is the formula to calculate the relative humidity?
Relative Humidity (%) = (Mass of Water Vapor in the Air) / (Mass of Water Vapor the Air Can Hold at That Temperature) x 100
What is the ratio of the mass of dry air to the mass of water vapor in the air called?
Specific humidity
Which property of windows is calculated by dividing the solar heat gain by the incident solar radiation energy?
SHGC
What is the formula for calculating the Total Heat Gain?
ER + EA + ET = 100 %
What is the formula for calculating the Projection Factor (PF) for vertical fins and overhangs?
Projection Factor Calculation
What drives diffusive moisture transport?
Temperature difference
What is the ratio of the mass of moisture in the air over the mass of dry air called?
Relative humidity
What unit of measurement is used to characterize the water vapor permeance of materials?
Perm
What is the formula for calculating the amount of water vapor a material allows through over a period of time?
Perm x Area x Time
Which of the following is NOT a property of windows mentioned in the text?
EA
What is the process called when the water phase changes from solid to liquid?
Melting
What is the contribution of Solar Heat Gain Coefficient (SHGC) to the Total Heat Gain?
80 %
Which of the following is the formula for calculating the moisture buffer capacity of a material?
$g/m^2$
What is the process called when moisture sticks on the surface of a material?
Adsorption
What is the unit of measurement used to characterize the water vapor permeance of materials?
Perm
What is the formula for calculating the amount of water vapor a material allows through over a period of time?
1 Perm = 1 grain/(ft^2hrinHg)
What is the difference in Absolute Humidity that drives diffusive moisture transport?
The difference in Absolute Humidity
What is the ratio of Relative Humidity that drives evaporation?
The ratio of Relative Humidity
What is the phase of water at 0°C (32°F) and 1 atm pressure?
Solid
What does a good Vapor Barrier do?
Keep the water out and let it out if it gets in
What are the three states (phases) in which water exists around us?
Solid, liquid, gas
Where should the vapor barrier be set to avoid condensation?
Towards the warmer side
Which of the following is NOT a process that can cause phase change in water?
Diffusion
What is the formula to calculate the relative humidity?
$RH = \frac{M_{water}}{M_{air} + M_{water}}$
What is the ratio of the mass of dry air to the mass of water vapor in the air called?
Absolute Humidity
Which of the following is NOT a property of water mentioned in the text?
Enthalpy
What is the process called when the water phase changes from solid to liquid?
Melting
What is the phase of water at 0°C (32°F) and 1 atm pressure?
Solid
What is the contribution of Solar Heat Gain Coefficient (SHGC) to the Total Heat Gain?
Significant
What is the formula for calculating the amount of water vapor a material allows through over a period of time?
$WV = A \cdot P \cdot t \cdot R$
What is the moisture buffer capacity of a material called?
Sorptivity
What is the process called when the water phase changes from liquid to gas?
Evaporation
Test your knowledge on the properties of windows, calculating U-value and SHGC, the impact of shading devices, and calculating Projection Factor and adjusted SHGC in Integrated Building Systems 1.
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