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TÜV
TUV is an abbreviation for Technischer Überwachungsverein – a state-registered testing agency independent of manufacturers and operators.
Two-pipe system
There are two basic categories of pipe systems: one-pipe and two-pipe sytems.
U-value
The U-value describes the heat loss per sq. metre in relation to the temperature difference between the interior and exterior.
Uniform corrosion
Metallic corrosion involves the loss of metal at a spot on an exposed surface – ranging from uniform attacks over the entire surface to severe local attacks.
Variable frequency drive
A variable frequency drive is used for adjusting a flow or pressure to the actual demand.
Vortex impeller
The benefit of a vortex impeller over a channel impeller is the minimised risk of clogging.
Wastewater
Wastewater is a common designation for any water that in one or another way has been affected in quality by human influence.
Water flow rate
Required heating capacity and required temperature differential of the medium are relevant when calculating the design water flow rate for a heating system.
Water hammer
Water hammer can cause pipelines to break or induced damage to equipment if the water hammer is severe enough.
Water hammering
Destructive force that relates to the incompressibility of water.