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Driving pump curve
The driving pump curve shows the total effect of the positive pump curve and the negative system characteristics
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 installation
In a dry installation the pumps are not submerged in the pumped liquid, but installed next to the sump.
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.
Dry weather flow
Dry weather flow refers to the wastewater flow in a sewer system during periods of dry weather with minimum infiltration.
Duty point
The duty point is at the intersection between the Q-H curve and the system characteristics.
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.
Dynamic pressure
In a closed, pressurised system with a circulating media, the total pressure consists of two elements; a static pressure and a dynamic pressure. The dynamic pressure indicates the amount of the total pressure that results from the media’s velocity in the pipes.
Economizer
The operational efficiency of boiler systems that use natural gas as fuel can be improved by utilising the water content of the flue gas.
Efficiency curve
The curve shows the η (efficiency) of the pump. Efficiency is measured in %.