Media properties to be considered for a few selected groups of fluids:
|Density ρ||Specific heat capacity c||Kinematic viscosity ν|
|Group of fluids|
|Water||No||No||No (FR = 1)|
|Water with antifreeze||Yes||Yes||Yes|
|Heat transfer oils||Yes||Yes||Yes|
Notes on water and water with antifreeze
The HVAC Integrated Tool (HIT) supports sizing and selection of valves for water and water with antifreeze (www.siemens.com/hit).
Notes on heat transfer oils and brines
When sizing valves for use with heat transfer oils or brines, the medium properties specified by the suppliers must be taken into account:
Specific heat capacity c
Kinematic viscosity ν
Specific density ρ
During the heating up phase, the kinematic viscosity ν can reach a high level while the volumetric flow V and thus the available amount of heat Qheating up phase are much smaller than planned. This must be taken into account during the planning phase and when sizing the valves, see "2.10.3 Example for heat transfer oil", page 45.