Indoor Environment Quality
Glossary - Indoor Environment Quality HVAC
Heating, Ventilation and Air Conditioning. IEQ
Indoor Environmental Quality encom- passes all aspects of the indoor setting including air quality, ventilation, thermal comfort, lighting and noise.
IAQ
Indoor air quality may be broadly de- fined 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 envi- ronmental heat stress to prevent heat stroke during physical exercise or while at work. It determines heat stress given in humans on the job in thermally harsh environments. It is specified 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 theoretical index for a group of people when subjected to a par- ticular set of environmental conditions.
PPD
Predicted Percentage of Dissatisfied is the percentage of population who will be dissatisfied (uncomfortable) in a given en- vironment as predicted by a theoretical index.
Class 1 / Class 2
Sound measuring instruments, proces- sors and probes are classified as being Class 1 or Class 2 (also Type 1 or Type 2) according to the measurement accu- racy 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
6. 2 Carbon Dioxide (CO2 )
Colourless, odourless, noncombustible gas. Present in the atmosphere as a re- sult of the decay of organic material and the respiration of living organisms, and it represents about 0.033 % of the air. Car- bon 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.
in octave bands, as specified in ISO 9614. Octave
The difference between two frequen- cies where one is twice the other. For example, 200 Hz is an octave higher than 100 Hz. 400 Hz is one octave higher than 200 Hz.
Decibel (dB)
A logarithmic measurement unit that describes a sound’s relative loudness. It can also be used to describe the relative difference between two power levels. In sound, decibels generally measure a scale from 0 (the threshold of hearing) to 130 dB (the threshold of pain). A 1 dB difference over a broad frequency 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 flux on a surface; illuminance is the standard metric for lighting level and is measured in lux (lx).
Luminance
The luminous intensity of a surface in a given direction per unit area of that sur- face as viewed from that direction.
Carbon monoxide (CO)
Poisonous gas that has no colour or odour. It is given off by burning fuel (as in exhaust from cars or household heaters) and tobacco products. Carbon monoxide prevents red blood cells from carrying enough oxygen for cells and tissues to live.
MEASUREMENTS Air Velocity Air Flow
Relative Humidity Dew point Air teperature Temperature difference K Thermocouple temperature Illuminance Luminance Contrast
Black globe radiant temperature CO concentration CO2 concentration
Sound level, class 1 (IEC 1672) Sound level, class 2 (IEC 1672) Real time 1/1 octave analysis Real time 1/3 octave analysis TEST PROBES
A 1091 Microclimatic probe
A 1127 Humidity and temperature probe A 1092 Illuminance probe, type B A 1132 Luminance probe
A 1128 Thermocouple probe, type K A 1146 Sound probe, class 1 A 1151 Sound probe, class 2 A 1131 Black globe thermometer A 1180 CO2
probe
A 1181 CO probe PC SOFTWARE
A 1134 SensorLink PRO A 1167 SoundLink LITE A 1162 SoundLink PRO CERTIFICATES
ISO calibration certificate for complete system
Calibration certificate
Part No.:
Accessories: page 6.10
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