The standard outdoor temperature according to DIN EN 12831-1 is the outside air temperature used to calculate the heating load (standard heat losses) of a building. It represents the cold design case for which the heating system must be sized. For Germany, this value...
The nominal pipe diameter DN, which is also known as the nominal connection diameter or simply the nominal diameter, indicates the approximate internal diameter of a pipe in millimetres (mm). The nominal pipe diameter is given without a unit in DN (French: diamètre...
The temperature difference, also known as the temperature spread, indicates the difference between two temperature measuring points. An example of this is the temperature difference in a heating system between the flow and return temperatures. The temperature...
The temperature level of a heating system describes the target system temperature of the heating system at full load. Example: The heating system runs at full load at a standard outdoor temperature of -14 °C with the following system temperature: flow = 75 °C, return...
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