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E Tech I: Glass test
n/a
43
Architecture
Undergraduate 3
07/15/2011

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Term
U-value
Definition
a basic measurement of thermal transfer (btus per hour)
Term
R-value
Definition
a numerical measure of resistance to the flow of heat
Term
thermal insulation
Definition
keeps a building cooler in the summer and warmer in the winter by slowing down the passage of heat through the exterior surfaces of the building
Term
thermal insulation
Definition
reduces convective drafts; reduces energy consumption of the building (heating and cooling) to a fraction of the cost
Term
3 basic forms of insulation
Definition
1. rigid foam & foam-in-place; 2. fiberglass blankets & batts; 3. blow-in loose fill
Term
rigid foam & foam-in-place
Definition
highest R value per inch of thickness; very flammable
Term
fiberglass blankets & batts
Definition
non-combustible
Term
blow-in loose fill
Definition
usually used in attic spaces only; easy and quick installation
Term
Why is glass generally the most problematic envelop material?
Definition
high heat loss in winter (low R values), high heat gain in summer (direct solar radiation) through unshaded glass and poor orientation
Term
criteria for selection of glass
Definition
energy performance, structural adequacy (wind-load, earthquake, snow-load resistance), temperature related stress/resistance, fire resistance, safety resistance
Term
glazing
Definition
process of placing glass or glazing in windows and making a weather tight joint between the glass and its frame
Term
rubber,neoprene & vinyl
Definition
synthetics that are particularly effective in allowing for the thermal expansion and contraction of glass
Term
plastic or acrylic
Definition
often used as alternate material to glass in skylights
Term
shading coefficient
Definition
ratio of solar heat gain through a specific type of glass that is relative to the solar heat gain through a 1/8" (3mm) ply of clear glass under identical conditions
Term
as this number decreases, heat gain is reduced, which means a better performing product
Definition
shading coefficient
Term
glass types
Definition
tempered, heat-strengthened, laminated, fire rated, spandrel, fitted
Term
laminated glass
Definition
made by sandwiching a transparent polyvinyl butyric (PVB) interlayer between sheets of glass which are all bonded together under heat and pressure
Term
tempered glass
Definition
glass that is reheated and rapidly cooled, which causes it to break into pea-sized pellets
Term
insulated glass
Definition
glass that increases R value (insulating value) and prevents condensation from forming on the glass; can be manufactured from almost any type of glass; sealed air space
Term
low-e glass
Definition
glass has a silver coating that restricts energy flow; coating is applied on the inside face of double pane insulating glass that restricts thermal energy flow in a specific direction depending on placement
Term
heat-absorbing glass
Definition
tinted to absorb a high degree of solar radiation, thus transmitting less solar heat and glare into building
Term
safety glass
Definition
bullet resistant glass
Term
wire glass
Definition
made by placing wire mesh in the middle of glass during manufacturing process; glass remains intact and restricts the expansion of fire
Term
fritted glass
Definition
glass that has an imprint on the surface with silk screened patterns of ceramic based paint (which consists of pigmented glass particles called frits)
Term
spandrel glass
Definition
has an opaque band covering the edge of floors in curtain walls (usually tempered or heat strengthened)
Term
mirror glass
Definition
has a silver coating, usually used in interiors
Term
float glass
Definition
sheet of glass made by floating molten glass on a bed of molten metal (tin)
Term
curtain wall system
Definition
exterior wall system that is attached to the structural framework of a building and carries no weight other than its own and wind loading that it transfers to the structure
Term
Lever House
Definition
New York; Gordon Bunshaft of Skidmore, Owings, and Merrill (SOM); 1951-52; first example of the curtain wall expressed as an uninterrupted glass membrane
Term
storefront
Definition
takes into consideration ingress/egress, visual connection with street, security
Term
curtain wall
Definition
non-load bearing, multi level spans, supported by floor framing, site fabricated/prefab, climate modification, higher wind loads, image
Term
structural glass walls
Definition
made up of tempered glass sheets suspended from special clamps, or spider fittings and are stabilized against wind pressure by perp. stiffeners and/or cables
Term
glass fin system
Definition
used as structural elements to carry glass gravity and wind loads
Term
Zero Energy Media Wall
Definition
Beijing, China; Simone Giostra & Partners and Arup; 2008 Olympics; world's largest color LED display combined with China's first photovoltaic system to be integrated into a glass curtain wall (100% energy sufficient)
Term
idea of a "folding facade" or a "fabricated facade"
Definition
to create a double skin that has a dual purpose: one explores the depth of the facade as a space that will be locally accessible through volume and plane projections creating occupiable space; second to allow for ventilation and airflow in the intermediate cavity
Term
photovoltaic glass
Definition
special glass with integrated solar cells, to convert solar energy into electricity (power for an entire building can be produced within the roof and facade areas
Term
drawn glass (Fourcault process)
Definition
sheet pulled directly from a container of molten glass; glass seen in older houses that; replaced by float glass
Term
plate glass
Definition
prior to both drawn and float glass; dimensionally inaccurate and often created visual distortions
Term
primary issues affecting the use of glass
Definition
orientation, shading, and type of glass
Term
water penetration
Definition
two main areas of concern are where glass fits into aluminum framing system and the perimeter of framing systems
Term
types of glass curtain walls
Definition
stick system, unitized system, unit and mullion system, panel system, and column cover and spandrel system
Term
stick system
Definition
oldest and most widely used; only one that does not consist of prefab wall units
Term
types of facades
Definition
breathing, patterned, textured, articulated, performative, media, interactive,green, biomimetic, self-cleaning, inflatable-membrane, high performance
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