Bronkhorst CoriCalc - Manual (Page 4)

page 4 9.17.056
1 General description
CoriCalc is a software program for calculating important sizing parameters for applications with (mini) CORI-FLOW®
instruments using mathematical models of the sensors and valves and physical properties provided by Bronkhorst
FLUIDAT® or Bronkhorst FLUIDAT® on the Net.
The following can be calculated/advised:
- Pressure drop over sensor related to flow
- Minimum inlet pressure for sensor/controller related to flow and outlet pressure
- Maximum outlet pressure for sensor/controller related to flow and inlet pressure
- Maximum flow based on the inlet- and outlet pressure
- Orifice diameter
- Sensor and valve type
- Density, viscosity and phase of fluid (if available in FLUIDAT®)
1.1 CoriCalc with automatic fluid properties
CoriCalc can be installed next to FLUIDAT® (license required) to offer full functionality.
Thanks to the information in the fluid database, CoriCalc can determine if a fluid is in a liquid or gas phase at a certain
temperature and pressure. Also the density and viscosity of the fluid will be known.
Note
1.
Use of FLUIDAT® local database is for selected users only. Installation and authorization will be coordinated by
Bronkhorst.
2. Although Bronkhorst puts much effort in building and maintaining FLUIDAT® with fluid properties, it does not
contain all properties for all fluids. For some applications estimations should be made to predict the instrument
behavior if no fluid data is available.
1.2 CoriCalc with manual fluid properties
If installed without FLUIDAT®, CoriCalc can be used with limited functionality.
There will be no info available regarding fluid properties. Density, viscosity and fluid phase have to be entered
manually, using ‘custom fluid’ settings. For entering the density and viscosity, property information of fluids can be
obtained from FLUIDAT® on the Net (see
www.fluidat.com ), or the table in chapter 6 can be used. It consists of several
gases and liquids often faced in applications.
1.2.1 Fluid properties for gases
For gases the density is of importance for pressure drop calculations. The viscosity is less important for this type of
calculation. The lower the density, the higher the volume flow needs to be for the same mass flow, which results in
high pressure drops over the sensor. E.g. He and H2 are very light gases which result in relative high pressure drops.
Note
For gases CoriCalc needs the density (and viscosity) at normal conditions. This means the conditions at 0 °C and
1013.25 mbar (a), so not the density (and viscosity) at actual conditions.
1.2.2 Fluid properties for liquids
For liquids the dynamic viscosity is of importance for pressure drop calculations. The density is less important for this
type of calculation, although a higher density will give a lower pressure drop in practice.
High viscous fluids, like oils or glycerin, need more pressure to get through the sensor tubes at the same flow as e.g.
water. Low viscous fluids, like alcohols give less pressure drop at the same flow rate.
Note
For liquids CoriCalc needs the actual viscosity (and density) for the pressure drop calculations.