Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| energy |
1. capability for doing work. 2. capacity for producing an effect. Having
several forms, which may be either stored or transient, and can be transformed
from one into another. Forms include thermal (heat), mechanical (work),
electrical, radiant, and chemical |
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| energy audit | identification and documentation of gross energy
usage during a calendar period using any of several means, such as source,
department, product, equipment, and cost. |
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| energy availability | maximum fraction of energy in a system that, in
the presence of a medium at a given temperature T0, can be converted into useful work during a process
at the end of which the system temperature is T0 |
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| energy factor | measure of overall efficiency in terms of energy
output compared to energy consumption over a 24-hour cycle |
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| energy quality | temperature of an energy stream as a measure of
potential energy.
district heating energy quality temperature of
the district heating energy stream as a measure of potential energy. Note: Quality is a measure of both
absolute and relative energy source potential: while an energy stream at 5°C is
of lesser absolute quality than one at 15°C, the 5°C stream provides higher
quality cooling potential relative to a 20°C ambient. |
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| energy sources | conventionally, fossil fuels, hydro, nuclear,
solar, geothermal, and wind |
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| energy value target | energy use value to which a building is designed |
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| engineering |
design, technology, and practice by which the
properties of matter and the sources of power in nature are made useful to
humans in structures, machines, and products. |
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| enthalpy (heat content) |
thermodynamic quantity equal to the sum of the
internal energy of a system plus the product of the pressure-volume work done
on the system. h = E + pv,
where h = enthalpy or total heat
content, E = internal energy of the
system, p = pressure, and v = volume. |
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| entropy chart (entropy diagram) |
graphical representation of thermal properties
of a substance with entropy as one of the coordinates. |
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