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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.
Detention tank
A detention tank is an artificial flow-control structure that is used to contain stormwater and wastewater for a limited period of a time.
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.
Diaphgram tank
The volume of the water in a pipe system will vary depending upon its temperature. An expansion tank is used to ensure the absorption of excessive volumes of water.
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.
Differential pressure regulating valve
Differential pressure regulators are built into the system where a constant differential pressure is desired.
Direct boosting
When a booster system is connected directly to the water mains it is called direct boosting.
Direct system
A direct system is a heating system where the heat emitters are directly connected to a boiler or district heating system. This means, that the district heating water is supplied directly to the consumer’s radiators or other heat surfaces.
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.
Discharge flow
Discharge flow is the assumed flow from discharge units. Normally, it refers to the flow entering a pumping station. It is typically expressed in litres per second or cubic metres per hour.