WindowMaster - English

Consultancy for natural and mixed mode ventilation

WindowMaster A/S

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Our services Annual number of hours [-] 110 100 90 80 70 60 50 40 30 20 10 0 Room 0.18 south facing Room 1.18 south facing Room 1.34a north facing Room 2.03, roof Temperature [ºC] > 26ºC >27ºC Air change rate in h -1 14 12 10 8 6 4 2 0 0 2 4 6 8 10 12 0°C 2°C 4°C 6°C 8°C 10°C Wind speed (m/s) Calculated air change rates based upon temperature differences and wind speed CO 2 concentration [PPM] 2000 1500 1000 500 0 Pulse every half an hour Time (h) 8 9 10 11 12 13 14 15 16 17 Example of the results from a thermal model on four classrooms Example of the calculated air change rates for an office area. The figure shows the air change calculation when both wind and temperature differences between the inside and outside air have been taken into consideration Example of the estimated CO 2 levels in a room with natural ventilation (winter mode) ©WindowMaster 2014, 2017 Ventilation proposals Discuss your project with us in the early concept and design phase and, following a detailed review of the proposed design, we will report back on how and where to optimize the building for natural or mixed mode ventilation. Air change calculations Our highly qualified and experienced experts are able to make accurate proposals for natural and mixed mode ventilation schemes, along with calculations of the possible air change rates in one or more climate zones. CO 2 level calculations We are able to calculate the expected CO 2 levels in the rooms ventilated with natural or mixed mode ventilation. Our many years of experience in the design and installation of projects and their subsequent post occupancy evaluation enable us to perform and evaluate the calculations more accurately. Dynamic simulations of the indoor climate In order to be certain that your proposed designs will meet the requirements for the indoor climate we are able to perform computational modelling calculations in BSim2002 and IES VE Pro. Our experience with these programs reveals that there is an excellent correlation between the actual measurements from the post occupancy evaluations of the completed buildings and the results from the thermal simulations. CFD analysis In some cases, for example unconventional building geometry, it may be advantageous to use CFD (Computational Fluid Dynamics) modelling tools for the analysis of the comfort levels within the spaces during different conditions. We are able to provide input to or perform such calculations. Dynamic simulations of the indoor climate and CFD analysis are usually carried out for an agreed fee, whereas ventilation proposals, air change calculations and CO 2 level calculations may be provided free of charge.

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