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Optimize Designs for Passive & Natural Ventilation

Test, validate, and optimize designs iteratively and easily in a cloud-based platform

Natural ventilation, also known as passive ventilation, is the process of supplying and removing air through an indoor space without using a mechanical system, such as a fan or any form of air conditioning (AC). It is driven by wind and stack effects based on temperature and pressure differences, as well as on outdoor wind speeds. Natural ventilation can provide comfort to occupants while at the same time reducing energy costs and environmental impact.
natural ventilation

Typical Natural Ventilation Applications

This type of ventilation can be applied to a number of scenarios, such as in buildings or structures:

  • With adjustable windows and doors (inlets and outlets)
  • In climates that allow for natural ventilation
  • Where devices (i.e. earth tubes) are employed to facilitate passive ventilation
  • With environmentally conscious standards (for example, ASHRAE 55)
What is natural ventilation

Why Is Online Simulation with SimScale Needed for This Application?

Designs that employ natural ventilation as the main source of air filtration must meet specific/strict regulatory standards and avoid safety hazards from air stagnation. The performance of a natural or passive ventilation system must be analyzed in the early design. However, the high cost of hardware and steep learning curves of traditional, on-premises tools leave many designers to feel that simulation is not an option.

SimScale has eliminated such traditional hurdles, thanks to the power of the cloud. With SimScale, engineers can:

  • Run multiple simulations in parallel for faster design optimization
  • Get started quickly with an easy-to-learn interface
  • Avoid manual updates, installation, or maintenance
  • Simulate other CFD, FEA, or thermal applications

Want to try SimScale to optimize your own passive ventilation design?

natural ventilation in an atrium

Natural Ventilation in an Atrium

In this project, air is free to enter the doors and exits on the left where we have openings.
The question is, is the flow evenly distributed throughout the building or only through some areas?

chimney effect ventilation cottage

Natural Ventilation in a Cottage in Summer and Winter Conditions

Understanding stack effect (or chimney effect) is extremely important for building design, as it creates natural ventilation caused by air infiltration. In this project, the ventilation of an English Cottage is analyzed in winter and summer conditions. The ventilation is designed to make maximum use of passive ventilation to reduce energy consumption and noise of mechanical HVAC units.

natural ventilation earth tube ventilation

Atrium Ventilation with Earth Tubes

This project aims to prove how earth tubes can be used to create natural ventilation in an atrium, and achieve an acceptable level of thermal comfort. Earth Tubes are passive devices that capture constant subterranean temperature in order to cool down a warmer zone.

cross ventilation

Cross-Ventilation Flows for a Generic Isolated Building

Cross ventilation (also known as wind driven ventilation) is a natural method of cooling, and falls under the category of natural ventilation. This project assesses the ventilation effectiveness of a room due the interaction between the exterior and the interior of a building under constant wind velocity.

gruner roshi ventilation simulation 1

Gruner Roschi AG determined the best natural ventilation solution through parallel processing with SimScale

“Working with SimScale gave us the possibility to inspect which of the architectural and technical solutions works the best way and give us certainty about our decisions. One other big factor is the speed in which SimScale can deliver results, through its great parallelization capacity. Without SimScale, we wouldn’t be able to deliver high quality results in the required time period.”

David Akeret VDC Specialist

Gruner Roschi AG
external flow ingen

Ingenieurbüro Gratzl uses cloud-based CFD from SimScale as a cost-effective alternative for building optimization.

“SimScale gives me, for the first time as a small specialized engineering office, the possibility to use CFD simulations for building optimization. Other software packages cause much too high investment costs for hardware and software.”

Markus Gratzl Expert in the field of Green Building Simulation and owner of Ingenieurbüro Gratzl

Ingenieurbüro Gratzl

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