[L4]_Space Loads Flashcards
IND405
What is the definition of U-Factor?
[L4]
The rate at which heat flowsthrough a specific material or a building section.
[L4]
IND405
What is the definition of R-Value?
[L4]
The rate and ability of one specific material, or a group of materials in a building section, to resist heat flowthrough them.
[L4]
IND405
What are the typical heat transfer loss rate % through each building assembly?
[L4]
- Roof = 25%
- Glazing = 10%
- Doors = 15%
- Exterior Walls = 35%
- Floors = 15%
[L4]
IND405
What is the definition of K-Value?
[L4]
The thermal conductivity property of a specific homogenous material.
[L4]
IND405
List the four (4) methods to calculate overall heat transfer coefficient.
[L4]
- Thermal conductivity (k) and thicknesses of all homogenous materials
- Thermal conductivity (k) and thicknesses of all non-homogenous materials
- Surface conditions of both sides of construction (inside & outside)
- Potential air gaps and spaces within the construction
[L4]
IND405
What is the highest insulation material name and r-value?
[L4]
Polyisocyanurate or PolyIso (Foil-Faced) & 7.2 R-Value
[L4]
IND405
What is typically the cheapest and easiest insulation to install?
[L4]
Fiberglass Batt Insulation
[L4]
IND405
How much reduction of heat transfer can be achieved in windows with properly installed shading (blinds) devices?
[L4]
Up to possibly 25%
[L4]
IND405
True or False: An entire homogenous wall assembly of the same materials versus a non-homogenous wall assembly have the same r-values?
[L4]
False, non-homogenous wall assembilies can have different % of materials for components based on total composition resulting in a different overall r-value.
[L4]
IND405
True or False: When calculating the total wall assembly R-Value any interior/exterior air films and core air gap insulation values must be selected properly and included in the overall calculation?
[L4]
True.
[L4]
IND405
What is the component temperature for the inside layer of the brick?
[L4]
34.1°F
[L4]
IND405
What are the four (4) basic mechanisms which energy use occurs through building fenestration?
[L4]
- Thermal Heat Transfer
- Solar Heat Gain
- Air Leakage/Ventilation/Exchange
- Daylighting
[L4]
IND405
What is fenestration?
[L4]
Fenestration is another term to describe windows or aka glazing.
[L4]
IND405
What is laminated glass?
[L4]
Glazing made of two (2) panes of glass adhered together and the interlayer
between the two (2) panes of glass is typically plastic and may be clear, tinted, or coated.
[L4]
IND405
What is a Low-E coating?
[L4]
An internal glazing coating that reduce UV and or radiant heat exchange.
[L4]
IND405
In a passive house (Hauss) structure, typically how many panes does a glazing assembly have?
[L4]
Three (3), a triple pane window.
[L4]
IND405
Does a thermal break in a window frame mean the total insulation value of the window is increased or lowered?
[L4]
Total insulation value of the window is greater with a thermal break.
[L4]
IND405
What are the two (2) typical noble gases used to insulate windows?
[L4]
- Krypton
- Argon
[L4]
IND405
What is the typical wind speed used to specify outdoor air-films on windows and buildings?
[L4]
15-mph
[L4]
IND405
In a typical building wall assembly what is the name of the membrane that separates moisture from exterior to interior spaces?
[L4]
The vapor barrier
[L4]
IND405
What is GST?
[L4]
Ground Surface Temperature, the annual mean temperature value over the entire winter of the specified location.
[L4]
IND405
What part of slab-on-grade surface does heat loss occur the most?
[L4]
The perimeter.
[L4]
IND405
What is a buffer space?
[L4]
The buffer space is an adjacent zone between occupied and unoccupied spaces aka partitioned space.
[L4]
IND405
What is the internal heat gain formula from light fixtures?
[L4]
Qel = 3.41 * W * Ful * Fsa
[L4]
