THERMAL Flashcards
Methods of damproofing
Admixtures Bituminous coatings Cementitious coatings Membrane Plastics - above grade
Water barriers
First line of defense against water penetration - surfaces that shed as much water as possible out of and away from bldg or to drainage lines
Vapor retarder
Material used to slow the transmission or diffusion of water vapor between spaces
Vapor diffusion
Slow movement of water molecules through vapor permeable materials
Types of insulation
Loose-fill insulation Batt insulation Board insulation Sprayed foam insulation Sprayed fiber insulation Radiant barriers and reflective insulation Insulated concrete forms Structural insulated panels
Solar heat gain coefficient
Fraction if incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward
0-1
0 less heat goes thru
1 more heat goes thru
Solar insolation
Radient energy per sqft of the sun
Skin load dominated building
Thermally controlled by the conditions outside: temperature, humidity, solar radiation, wind.
benefits from the use of glass with a high solar gain coefficient
Passive heating-direct gain spaces
Internal load dominated building
Larger buildings with lower skin to volume ratios or bldgs that involve programs with significant internal gain from people, lighting and equipment
Benefits from low solar heat gain coefficient to minimize fenestration solar heat gain
Sensible heat
Heat that we feel or sense; measured with thermometer
Kinetic energy of the air molecules in a space
Vertical lines in chart- measured along horizontal axis
Latent heat
Embodied energy in moisture in the air
Heat energy required for a change of state (water to water vapor)
Wet bulb temperature and its relationship to the dry bulb temperature measure latent heat
Skewed axis
Enthalpy
Total heat content of air: sensible + latent
Skewed axis
Relative humidity
Moisture content of an air sample relative to the amount of moisture that air can hold at a given temperature
Warm air is capable of holding more moisture than cold air
Curved lines that slope upward in chart
Humidity ratio
Absolute quantity of moisture (water vapor) in the air
Ratio of the mass of water vapor to the mass of dry air contained in a given air sample
Horizontal lines in chart- measured along vertical acis
Comfort zone
Range of conditions where most people would consider themselves comfortable
68F to 78F and 20% to 80% relative hunidity
