Indoor Environment Quality
Glossary - Indoor Environment Quality HVAC
Heating, Ventilation and Air Condi- tioning
IEQ
Indoor Environmental Quality en- compasses all aspects of the indoor setting including air quality, ventila- tion, thermal comfort, lighting and noise. IAQ - Indoor air quality may be broadly defi ned as the nature of air that affects the health and well- being of occupants.
WBGT Wet Bulb Globe Temperature is com- monly used as a guidance for environ- mental heat stress to prevent heat stroke during physical exercise or while at work. It determines heat stress giv- en in humans on the job in thermally harsh environments. It is specifi ed in ISO 7243 under ’Hot Environments.’ Estimation of the heat stress on is based on the WBGT-index.
PMV
Predicted Mean Vote is average comfort vote predicted by a theo- retical index for a group of subjects when subjected to a particular set of environmental conditions.
PPD
Predicted Percentage Dissatisfi ed is the percentage of subject population who will be dissatisfi ed (uncomfort- able) in a given environment as pre- dicted by a theoretical index.
Class 1 / Class 2
Instruments, processors and probes are classifi ed as being Class 1 or Class 2 (also Type 1 or Type 2) accord- ing to the measurement accuracy achieved. A class 1 instrument may only be formed by combining a class 1 probe with a class 1 processor. Class 1 processor shall, at least, cover the range from 45 Hz to 7.1 kHz in one third octave bands. Class 2 processor shall, at least, cover the same range, or 45 Hz to 5,6 kHz in octave bands, as specifi ed in ISO 9614.
Octave The difference between two fre- 6. 2 Carbon monoxide (CO)
Poisonous gas that has no color or odor. It is given off by burning fuel (as in exhaust from cars or house- hold heaters) and tobacco products. Carbon monoxide prevents red blood cells from carrying enough oxygen for cells and tissues to live.
Colorless, odorless, noncombus- tible gas. Present in the atmosphere as a result of the decay of organic material and the respiration of living organisms, and it represents about 0.033% of the air. Carbon dioxide is produced by the burning of wood, coal, coke, oil, natural gas, or other fuels containing carbon, by the ac- tion of an acid on a carbonate, or naturally from springs and wells.
Carbon Dioxide (CO2 Accessories: page 6.12 ) Decibel (dB)
A logarithmic measurement unit that describes a sound’s relative loud- ness, though it can also be used to describe the relative difference be- tween two power levels. In sound, decibels generally measure a scale from 0 (the threshold of hearing) to 130 dB (the threshold of pain). A 1dB difference over a broad fre- quency range is noticeable to most people, while a 0.5 dB difference can affect the subjective impression of a sound.
Illuminance
The density of incident luminous fl ux on a surface; illuminance is the standard metric for lighting levels, and is measured in lux (lx).
Luminance
The luminous intensity of a surface in a given direction per unit area of that surface as viewed from that direction.
quencies where one is twice the other. For example, 200 Hz is an oc- tave higher than 100 Hz. 400 Hz is one octave higher than 200 Hz.
Measurement with universal mi- croclimatic, illuminance, CO and CO2
probes.
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