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Dew point
The dew point temperature is the temperature where the water content in the air condenses into water.
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.
Discharge de-superheater
A discharge de-superheater can be used in a cooling plant to produce domestic hot water.
Discharge flow
Discharge flow is the assumed flow from discharge units.
District heating
District heating describes a water-based heating system where there is a considerable distance between the place the heat is generated (power plant) and the place the heat is used (the building).
Dosing pumps
The dosing pump belongs to the positive displacement pump family and is typically a diaphragm pump.