defrosting heat ratio
[EN 12792-2003, 100]:ratio between the energy transferred into the supply air and the maximum recoverable energy in exhaust air, excluding the energy input for defrosting.
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degree day
[AIVC, Air infiltration and ventilation glossary, 1992]:the number of degrees of temperature difference on any one day between a given base temperature and the 24-hour mean outside air temperature for the particular location. The average number of degree days for … Continue reading →
dehumidification
[AIVC, Air infiltration and ventilation glossary, 1992]:the process of reducing the moisture content of the air; serves to increase the cooling power of the air and can contribute to occupant comfort.(See air conditioning; humidification; cooling; heating [EN 16798-1:2019, 3.12]:process of … Continue reading →
demand controlled ventilation (DCV)
[AIVC, Air infiltration and ventilation glossary, 1992]:A ventilation strategy where the airflow rate is governed by a chosen pollutant concentration level. This level is measured by air quality sensors located within the room or zone. When the pollutant concentration level … Continue reading →
depressurization
[AIVC, Air infiltration and ventilation glossary, 1992]:a measurement technique used to evaluate the airtightness of a building or component. The air inside the room or building is extracted by the use of a fan, creating a lower pressure inside than … Continue reading →