Windows and Energy Efficiency Quiz
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Questions and Answers

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?

    <p>It refers to the moisture sticking on the surface of the material</p> Signup and view all the answers

    What drives diffusive moisture transport?

    <p>Difference in Absolute Humidity</p> Signup and view all the answers

    What drives evaporation?

    <p>Difference in Relative Humidity</p> Signup and view all the answers

    What is the purpose of a vapor barrier?

    <p>To keep the water out</p> Signup and view all the answers

    What happens when moisture doesn't dry out?

    <p>It accumulates on impermeable surfaces</p> Signup and view all the answers

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

    <p>Moisture buffer capacity</p> Signup and view all the answers

    What is the definition of a perm?

    <p>One grain of water vapor per hour per square foot per inch of mercury</p> Signup and view all the answers

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

    <p>SEF</p> Signup and view all the answers

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

    <p>Shading devices</p> Signup and view all the answers

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

    <p>PF = SHGC / U-value</p> Signup and view all the answers

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

    <p>Adjusted SHGC = SHGC x SEF</p> Signup and view all the answers

    What does WWR stand for in the context of windows?

    <p>Window-Wall Ratio</p> Signup and view all the answers

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

    <p>An optical property of a light transmitting material</p> Signup and view all the answers

    What is a thermal bridge?

    <p>A section where heat flow is different/facilitated</p> Signup and view all the answers

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

    <p>SHGC = ER + EA + ET</p> Signup and view all the answers

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

    <p>Total Heat Gain = SHGC x Solar Radiation Energy</p> Signup and view all the answers

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

    <p>Melting and freezing</p> Signup and view all the answers

    Which one of these is true about phase change?

    <p>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</p> Signup and view all the answers

    Which one of these is true about moisture transport?

    <p>Moisture transport can occur through diffusion, capillary action, osmosis, and gravity</p> Signup and view all the answers

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

    <p>A Psychrometric Chart is used to determine the properties of moist air, such as temperature, humidity, and enthalpy</p> 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?

    <p>At this temperature and pressure, water is undergoing phase change and is in a state between solid and liquid</p> 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?

    <p>At this temperature and pressure, water is undergoing phase change and is in a state between liquid and gas</p> Signup and view all the answers

    Which of the following is true about phase change?

    <p>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.</p> Signup and view all the answers

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

    <p>Movement from a region of higher humidity concentration to lower concentration of humidity.</p> Signup and view all the answers

    Which of the following is true about capillary action?

    <p>Water in a narrow space has the capability to 'climb' and capillary action is more common than designers think.</p> Signup and view all the answers

    Which of the following is true about osmosis?

    <p>Osmosis is a problem prevalent in areas where groundwater has a high concentration of salt in it.</p> Signup and view all the answers

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

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

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

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

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

    <p>A psychrometric chart is used to determine properties of air such as temperature, humidity, and enthalpy.</p> Signup and view all the answers

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

    <p>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.</p> Signup and view all the answers

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

    <p>Gravity can move moisture when possible, but it is not a significant contributor to moisture transport.</p> Signup and view all the answers

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