Digital determination of heat losses

New computer simulation to evaluate ErP classes

Energy efficiency classification ensures transparency

According to the EU regulation EU directive 812/2013, the energy efficiency of hot water storage tanks must be classified. Therefore, the heat loss is usually determined in a test laboratory by measuring the heat loss. However, this procedure has limitations in its applicability. With different storage and insulation variants, all combinations would have to be measured. In this case, a heat loss simulation would be more cost-effective and time-efficient. 

 

 

Simulation of heat losses of hot water storage tanks

The heat loss simulation is basically a virtual representation of the heat loss measurement process. Consequently, the hot water tank, the insulation and the test laboratory are simulated in a simulation software. For this purpose, we use a so-called Computational Fluid Dynamics (CFD) simulation. This is a numerical simulation for the representation of fluid dynamics and heat transfer. In our case, we simulate the process of heating and maintaining the water temperature. According to the test standard EN 15332, the results of the simulation are applicable for an energy efficiency classification.

Heat loss simulation offers many advantages

Reduced process time Simulation is faster than physical measurement.
Reduced costs No prototyping and no shipping necessary.
Simulation of product programs Storage sizes and insulations can easily be varied.
Optimal price-performance ratio By comparing different insulation variants.

Find various optimization possibilities for your products

The simulation of heat losses offers, in addition to savings in terms of costs and time, several other useful features. For example, different insulation materials and thicknesses can be replaced with just a few clicks. This makes it easy to identify the best heating insulation for each individual storage tank size. This makes it possible to ensure highest energy efficiency without a lot of prototype testing. In addition, several heat losses can be compared in order to determine the optimal price/performance ratio. Furthermore, the energy efficiency of foamed storage tanks can be improved. For these storage tanks, the optimal size and position of the foamed-in insulation panels (e.g. vacuum insulation panels) could be determined.


Simulation process

Storage tank, insulation and test laboratory is emulated in the software. 1 Storage tank, insulation and test laboratory is emulated in the software.
A calculation grid is created to calculate the heat loss. 2 A calculation grid is created to calculate the heat loss.
The Simulation is carried out. 3 The Simulation is carried out.
Heat loss values are determined and compared. 4 Heat loss values are determined and compared.
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