Heat Loss
A heat loss that is a result of heat passing through a material in the building envelope or an assembly of materials. Ex. glass, walls, ceilings.
What is transmission?
Occurs at 273 K and 460 R.
What is the ice point of water?
The study of the thermodynamic properties of gas-water vapor mixtures under varying temperatures and pressures.
What is psychometrics?
On a psychometric chart, if conditions are to the left of the comfort zone, then there is a need to increase what.
What is heating?
The three modes of heat transfer.
What is convection, conduction, and radiation?
U is the ability of a construction assembly to transfer heat from exterior to exterior including air films.
What is the overall coefficient of heat transmission?
The agitation or motion of atoms and molecules.
What is Heat?
The mass of air per unit volume at standard conditions
What is 1lb = 13 ft3?
On a psychometric chart, if conditions are to the right comfort zone, then there is a need to increase what.
What is cooling?
The movement of heat through a substance or between two substances in contact with each other.
What is conduction?
Heat losses that relate to air leakage through the building envelope and the energy required to heat unconditioned air that has entered the structure.
What is infiltration?
The change of temperature over some distance across a material
What is a temperature Gradient?
What is atmospheric air?
The formula for MRT where T is the temperature of a surface, θ is the horizontal angle of wall exposure relative to the position of the occupant, and MRT is the mean radiant temperature
What is MRT= [(T1θ1) + [(T2θ2) +[(T3θ3) +[(T4θ4) + ...]/360
Heat transfer by the motion of a heated or cooled mass.
What is convection?
The introduction of outdoor air into a space at a controlled rate with the intent to maintain/improve air quality.
What is ventilation?
The amount of of heat required to raise the temperature of 1lb of water from 59.5 degrees fahrenheit to 60.5 degrees fahrenheit at a constant pressure of standard atmospheric pressure.
What are British Thermal Units?
With a decrease in air pressure, density of air decreases. Similarly, with an increase in air pressure, density increases. As the temperature of air decreases, the density of air decreases etc.
At non standard conditions, how does air temperature and pressure influence air density?
A measue in the contribution that high ambient air temperature and high humidity make in reducing the body's ability to cool itself.
What is the heat index?
Involves movement of energy by electromagnetic waves.
What is radiation?
The way of expressing the rate at which air in an interior space is replaced by outside air caused by infiltration
What is air change per hour?
A capacity measured in Btu per cubic foot per degree temperature change (Btu/ft 3 degrees fahrenheit).
What is the property of specific heat capacity of a substance measured in?
Name 4 psychometric Variables.
What is dry bulb temp. (DBT), wet bulb temp (WBT), dew point temp. (DPT), relative humidity (RH)?
ASHRAE standard 55-2004.
What is Specifies a comfort zone representing the optimal range and combinations of thermal factors as well as personal factors?
The wavelength range of infrared.
What is IR range from approximately 0.75 μm to approximately 1000 μm?