CONVAL® - the PC software for engineers, planners and operators of industrial plants.

CONVAL^® integrates extensive calculation functionalities for components and processes in industrial systems, based on tried-and-tested methods, such as DIN, VDI, VDMA EN/ISO and ISA.

By strictly avoiding all forms of dependence on equipment manufacturers, CONVAL^® guarantees flexible, professional working.

The range of available calculations extends from control valves and throttle elements through piping systems to heat exchangers, including integrated property calculations (based on a property database) and comprehensive databases for control valves, safety valves, materials, etc. as standard.

The current release of CONVAL^® is 8.0

Supportinformations for older CONVAL^® versions can still
be found in the support area for CONVAL^® 7.0, CONVAL^® 6.0 andCONVAL^® 5.0.

CONVAL^® can calculate pressure and temperature-dependent properties according to various methods.

Almost all the program modules require a certain amount of information about the pressure and temperature-dependent properties of the medium being used in the process.

CONVAL^® is capable of calculating this process data automatically for a large number of media (approx. 1000) in connection with the calculation program.

Three different calculation methods for process data are offered at present, namely:

1. Using approximation equations based on a property database for physical constants.
2. By interpolation on the basis of a property database for actual measurement series.
3. With the help of extremely accurate thermodynamic equations of state.

  

Approximation is a very useful option if no special calculation methods, such as the steam table (IAPWS 97) for water, are available.

CONVAL^® integrates an extensible property database containing around 800 substances and their physical constants, which can be taken as a basis for pressure and temperature-dependent calculations of the substance properties.

The boiling pressure p_v of a liquid can be calculated, for example, in its state at a temperature t₁, or the boiling temperature t_v of this liquid in its state at a pressure p₁, in accordance with Riedel's correlation (error < 10%).

Alternatively, it is possible to calculate the real gas factors Z₁ and Z_n, and thus also the specific gas densities. This calculation is based on Newton and Raphson's correlations and on publications by Dranchuk, Purvis, Robinson and Takacs.

The operating density of liquids is calculated with the help of the physical constants stored in the database according to mathematical approximation methods described by R. W. Hankinson and G. H. Thomson. In conjunction with other authors these methods are also referred to as the COSTALD correlation. The error is < 1% for the majority of applications and only exceeds 5% under a very limited number of boundary conditions.

Approximation methods are also available for calculating the isentropic exponent, the sound velocity, etc.