Dataset Open Access
Transitional spaces are meant as “a space in between indoor and outdoor climate, or between two indoor environments, which thermal characteristics can be or not modified by mechanical control system and where occupant may experience the dynamic effect of this change”. Nowadays, transitional spaces are pivotal in non-residential architecture and the proportion of such areas may vary between 10% up to 40% of the total volume depending on the typology. Mixed-mode buildings are desings with by both active and passive systems.
The necessity of buildings’ energy demand and consumption reduction is a tangible fact after the entry into force of the EPBD directive 31/2010/EU. As a consequence buildings design went through the improvement of thermal envelope proprieties. In particular, for non-residential buildings this aspect combined with the increased level of internal gains has changed the energy balance: low heating demand compensated by an increased cooling demand not restricted to the only summer season.
This evidence has stimulated a renewed interest in designers for the exploitation of natural ventilation as means of passive cooling solutions. Transitional spaces rely on a great potential for natural ventilation exploitation. They have direct connection with the outside, their architecture based on large volume suites with the principles for an effective natural ventilation.
Because of the awareness of natural ventilation limitations, which relies on natural forces, the interest has progressively moved towards mixed-mode buildings. Mixed-mode buildings are indeed designed in such way that the HVAC system help to prevent uncomfortable conditions when natural ventilation is not sufficient to guarantee a comfortable environment.
With the aim of a better overview about the role of transitional spaces in mixed-modeventilation design, technical information about 17 non-residential mixed-mode buildings among Europe have been recovered and analysed. All the information about transitionals spaces typology, mixed-mode scheme, ventilation strategy, controls and HVAC integration have been collected in a small database presented by an excel factsheet.