Air exchange rate dataset of the BELUVA project

This dataset is extracted from the DFG (German Research Foundation) funded project BELUVA. The project is about the determination of air exchange rates in naturally ventilated barns and validation of prediction model.

Series of numerical air flow simulations inside and around naturally ventilated barns were undergone for five different parameter, the length to width ratio of the barn (LW), the side curtains position (Curt), the incoming air temperature (T), the incoming air velocity magnitude (Vel) and the incoming air velocity direction (Theta), see the figures “parameters_tree” and “Convection_and_Temp-Vel-pair”. More details can be found in the following papers:

On Finding the Right Sampling Line Height through a Parametric Study of Gas Dispersion in a NVB (https://doi.org/10.3390/app11104560)

A Parametric Model for Local Air Exchange Rate of Naturally Ventilated Barns (https://doi.org/10.3390/agronomy11081585)

50 planes of equal distance inside the barn from 0.39 m to 11.66 m height have been designed. Each plan contains a grid of points 100 along the width of the barn and 2, 3 or 4 x 100 points along the length L=2, 3 or 4 x W respectively.

Each file contains the coordinates of the grid points of one plan as well as the corresponding, ammonia concentration, carbon dioxide concentration and the Cartesian velocity components. The nomenclature of the file is as follows:

Yplane_LW_Curt_Conv_Temp_Vel_Theta_Yx-yz

LW: the length to width ratio, LW2, LW3 or LW4 corresponding to L=2, 3, 4 x W

Curt: the curtain position, Open (without curtain), OpenUp (curtain from floor to middle opening height) or OpenDown (curtain from roof to middle opening height)

Conv: the flow convection type, For (forced convection), Mix (mixed convection), Nat (natural convection)

Temp: the temperature, written x-y meaning x.y in Celsius (°C), for example 30-0 means 30°C

Vel: the air velocity magnitude, written x-y meaning x.y in m/s, for example 2-7 means 2.7 m/s

Theta: the air inlet angle, 0, 45 or 90 deg, see figure “Inlet-angle_and_Length-to-width-ratio”

Yx-yz: x-yz referring to the height of the plane x.yz, for example 3-15 means 3.15 m

The python script “contour.py” represents an example of use of the dataset. Here it serves to obtain contour plots of the temperature, velocity magnitude and ammonia and carbon dioxide concentrations from any case LW_Curt_Conv_Temp_Vel_Theta_Yx-yz. Once the command “python contour.py” is given in the terminal, the user just needs to follow the instructions and the contour plots will be created in the folder “Plots”.