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Degree day
Degree Days are a measure of how cold (or hot) it was over a period of time, and correspondingly how much energy is needed for heating (or cooling) a building.
Dew point
The dew point temperature is the temperature where the water content in the air condenses into water. This means that the water content in the air changes states from gas to liquid.
Diaphragm Tank
Diaphragm tanks are pressurized water vessels where the water and air are separated by a flexible diaphragm allowing the water to expand and absorb pressure surges.
Direct boosting
When a booster system is connected directly to the water mains it is called direct boosting.
Discharge de-superheater
A discharge de-superheater can be used in a cooling plant to produce domestic hot water. This is possible when there is a simultaneous demand for both cooling and hot domestic water in the building.
Drip tray
A drip tray is used to collect condensation or defrosted water from cooling surfaces when air is cooled to below the dew point, etc.
Dry cooler
A dry cooler is an air-cooled device that is used in connection with removal of excess heat. The cold media, normally water, is circulated through the dry cooler, where heat exchange with the surrounding air heats up the media.
Dry running protection
Dry-running protection is one of the most important monitoring functions, as bearings and shaft seal may be damaged if the booster pumps run dry. It is thus always recommend to install dry-running protection on all booster sets.
DX system
A DX system is a cooling system where the primary coolant is used for evaporation. DX systems are typically used with very small, stand-alone systems, but they can also be used in large industrial cooling systems.