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EC Unit II Vocab
| Question | Answer |
|---|---|
| chiller | a mechanical device in an HVAC system that removes heat from a liquid and circulates it to cool air in a building |
| conductance | a material property that measures the rate of heat flow through a material per unit area and temperature |
| convection | the movement of air in a building due to differences in temperature |
| degree day | a metric used in architecture to measure how much energy is needed to heat or cool a building |
| diffuser | devices that distribute conditioned air into a room and can improve the quality of the air and thermal comfort |
| economizer cycle | an add-on feature to an HVAC air handler that draws in outdoor air and mixes it with return air from indoors |
| emissivity | a surface property that measures a material's ability to emit radiation |
| forced air system | a part of an HVAC system that distributes heated or cooled air throughout a building using ducts and vents |
| four pipe system | a water distribution system that provides climate control for buildings. made up of two separate water coils, one for heating and one for cooling, each with its own supply and return pipes and valve |
| heat pump | uses electricity to provide both heating and cooling to a building |
| infiltration | uncontrolled ventilation whereby air is introduced into a building from outside |
| latent heat | the heat that's released or stored when a substance changes phase without changing temperature |
| reheat | the process of adding heat to air that has already been cooled |
| sensible heat | a type of heat energy that changes the temperature of a substance, material, or space without changing its phase |
| shading coefficient | the ratio of solar heat gain through a specific type of glass that is relative to the solar heat gain through a 1/8″ sheet of clear glass under identical conditions |
| three pipe system | a water distribution system that provides climate control for buildings. made up of two separate water coils, one for heating and one for cooling, with a shared supply and return pipe |
| two pipe system | a water distribution system that provides climate control for buildings. made up of two water coils, one for alternating heating and cooling, one for a shared supply and return pipe |
| U value | assesses the rate of heat loss or gain through all the thicknesses of the combined elements that make up a building component |
| BTU | British Thermal Unit |
| BTUH | British thermal units per hour |
| CLDT | cooling load temperature differential |
| HVAC | heating, ventilation, and air conditioning |
Created by:
okrajnik
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