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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.
Downtime costs / loss of production (Cs)
The measurable cost of a pump stoppage is modest seen over its lifetime in a commercial 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.
Driving pump curve
The driving pump curve shows the total effect of the positive pump curve and the negative system characteristics.