Hybrid Ventilation

Hybrid ventilation combines features of both mechanical and natural ventilation. The simplest often used definition of hybrid ventilation is “ventilation system that uses natural air intake through wall inlets in combination with mechanical extraction”. Although the mentioned ventilation systems certainly belong to the hybrid ventilation systems, the group of hybrid ventilation systems is considerably wider with the decisions quite different and strongly connected with the architectural design of the building.

The latest definition of hybrid ventilation system was developed in EC projects in IEA Annex 35 (1999) hybrid ventilation system is defined as two-mode system that switching automatically from one mode to another in different time of the day, season or a year provides necessary indoor air quality in an energy-efficient way.

The buildings with hybrid ventilation systems often are combined with other energy-efficient technologies such as passive and natural cooling, passive solar heating, etc as only integrated approach to the design of the building and its mechanical system gives the best results in buildings energy optimization.

Natural Ventilation SampleWSBP ENGINEERING  with her engineering project and product solutions (as Smart Window), offer to her clients a different ventilation systems that belong to the simplest type of hybrid ventilation systems with natural air that combine natural and mechanical driving forces. This has made it possible to satisfy relatively strict indoor air quality requirements formost of the time. A hybrid ventilation system can be described as providing a comfortable internal environment using different features of both natural ventilation and mechanical systems at different times of the day or season of the year. It is a ventilation system where mechanical and natural forces are combined in a two-mode system.  Our solutions (Ventilation and Controling) provide  a hybrid ventilation systems that combine natural and mechanical drivingforces. This has made it possible to satisfy relatively strict indoor air quality requirements formost of the time. A hybrid ventilation system can be described as providing a comfortableinternal environment using different features of both natural ventilation and mechanicalsystems at different times of the day or season of the year. It is a ventilation system wheremechanical and natural forces are combined in a two-mode system.

Using JanusBox that include a Scada system, in building Control and controlled parameters have to be chosen with regard to the control strategy being implemented and the technical feasibility of the measurements, as well as economic considerations. Various parameters may be measured depending on the objectives of the control strategy. In stead of traditional control strategies in hybrid ventilation systems new, more accurate and more demand dependent control strategies are applied, based on thermal
comfort (Predicted Mean Vote and Predicted Percentages of Dissatisfied) or Level of the Indoor Air Quality. Indoor air pollutants – particulates, gases and vapors – result from both outdoor and indoor sources. CO2 level may be considered as an indicator of the number of occupants, in nonsmoking areas.