Aerodynamic and thermal simulation
It happens that in the course of our professional work is necessary to solve non-trivial engineering tasks that goes beyond standard engineering techniques. Frankly, all of our objects are unusual and such non-trivial problems arise more often than you might expect.
Examples of such problems are: the use of fully glazed facades for premises with wet mode in regions with external subzero temperatures – the investor requests no condensate at all operating conditions! Or the problem of air distribution to the premises of theaters, convention halls. Or, for example, the task of cooling of the data center.
Often, for the correct solution of such problems it is necessary to model, not an existing object, the creation of which is associated with significant financial costs. The cost of failure is also high.
As early as in the 50-70 years of last age was newly arrived and solved the problems of modeling of various elements of heating, ventilation and air conditioning systems. The theory of similarity and dimension was used to summarize the experimental data and for the analysis of physical phenomena. The analytical solution of Nove-Stokes equations has always been great mathematical difficulties, so the experiment was preference, for example, in wind tunnels.
However, in the 2000s, the intensive development and use of computational fluid dynamics around the world began, making it possible to numerically solve the system Nove-Stokes equations for engineers interested in the problem.
We are proud to announce that we are ready to solve such problems in a professional manner and with the recent advances in mathematic simulation.
One example of successfully solved problem is the optimization of the size one of the difficult part of responsible duct, which on the one hand held up too much space, and another reduction of its dimensions was feared too of increasing of aerodynamic resistance that negatively affected on the acoustic characteristics.
Duct was modeled:
And it showed high resistance, and found the region of recirculating flow just around the corner. In order to optimize the duct cross-section usage, "calm down" the air flow guide vanes on corner were introduced.
Repeated simulations confirmed the correctness of decisions:
The resistance decreased by 40%, and the duct cross section is used more efficiently!
In case of calculations of the heat protection properties of the buildings external fences we also have to use computer-added technology, if there are heat transfer inclusions ("thermal bridges"). In case of traditional methods of calculations, including the calculation of two-dimensional temperature fields it is not possible to obtain the correct result - an example is shown in the figure below. On the left side of the picture shown obtained from the calculation of two dimensional temperature field, showing no violations code requirements. However, the solution of same 3-dimensional task on the right of the figure reveals a weak area of this node, which is highlighted in yellow. The temperatureis lower than that required by the rules in this area.
The next example is the node fence, shown on the illustration below - abutting the beam to the column. It is necessary to simulate three-dimensional temperature field in order to ensure the proposed design solutions for thermal protection are sufficient and provides no condensation regime on the inner surface.
It was modelled and the calculated temperature field was calculated, the result is shown on the figure below. On the left side there is a design version - the local area of the inner surface is clearly visible, highlited in yellow, with a temperature below the dew point temperature, and hence, except for increased heat losses, the condensate will appear in this area. The additional local heat isolation was used for the node to eliminate this phenomenon. Re-calculations showed compliance with regulatory requirements for thermal protection.
Mathematical modelling application allows a quantitative estimation of the air temperature and velocity distribution while HVAC system is in the operation. Here is the computational model of air flow and temperature if heating system with radiators is used.
this is the application of air heating with fan coil units: