Mixed mode ventilation or hybrid ventilation is a well-known concept that is a sustainable and cost-effective way to provide thermal comfort to occupants by regulating the indoor temperature. This ventilation strategy not only offers a means of indoor climate control, but also enhances indoor air quality by lowering CO2 levels, creating a healthier indoor climate, and improving occupant productivity.
Mixed mode ventilation systems combine all the best features of natural ventilation by controlling building openings automatically and intelligently with window actuators and a mechanical system.
Mixed mode ventilation systems reduce energy consumption through the reduction of mechanical fan use and, in some cases, the cooling demands. By using key natural ventilation strategies to ventilate during the day or night (night cooling), mixed mode ventilation reduces the use of mechanical systems and possibly the size of the system.
Like natural ventilation systems, mixed mode ventilation systems utilize sensors to monitor indoor temperature, CO2 levels, and humidity, as well as outdoor conditions. Based on this data, the system will automatically either chose natural ventilation or mechanical ventilation depending on which system is the most optimal to use. The system will then switch back to the natural ventilation strategies when appropriate.
For example, if the weather is too cold, too rainy, or too hot, the mixed mode ventilation system adjusts the building openings appropriately and communicates with the mechanical ventilation system to optimize the indoor environment. The system, then, takes a holistic approach to ensure occupant comfort and indoor climate health for a high-performance building.
Window actuators control building openings to let cool outdoor air into the building. This is often achieved through night cooling. Depending on climate, the building openings may also open during the day to change the air or cool the building, depending on indoor temperature parameters. These strategies ensure sustainable building operation through a minimum use of energy.
In some climates, a mixed mode ventilation strategy can work with a mechanical ventilation system to ventilate the building while recovering heat generated in the indoor environment. In this way, heat recovery can reduce heating demands while minimizing or eliminating the experience of draft.
WindowMaster mixed mode ventilation systems are intelligent indoor controls that monitor indoor and outdoor climate factors to deliver optimal indoor comfort. The climate can vary greatly during these seasons, so a combination of summer/winter strategy is often employed. The control system chooses between natural ventilation or mechanical ventilation, depending on what is most appropriate for both the indoor and outdoor conditions.
Because it’s a highly-effective indoor control strategy for sustainable buildings
The team of engineers at WindowMaster’s Ventilation Institute understand the design and commissioning for whole building controls and intelligent facade solutions. They can assist you in your project with simple advice or even detailed analysis such as CFD calculations and dynamic simulations of your building’s indoor climate.
Our team has many years of experience in designing systems for both new-build and refurbishment projects all over the world, as well as carrying out post-occupancy evaluations through research and development projects. They've implemented mixed mode ventilation in various buildings including apartment complexes, office buildings, schools and hospitals.
To create the best possible sustainable solutions, it is important to see the possibilities, especially in the early stages of building projects. Our team of engineers is committed to helping our customers with advice and support whenever needed. Try our natural ventilation calculator now and find out if natural ventilation is suitable in your building.
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