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AIVC's Ventilation Information Paper #48.1 summarizes current knowledge on trends in building ventilation requirements and inspection in Spain. More specifically, the paper aims to cover the following national trends:

• IAQ requirements and market,
• energy requirements and market,
• inspection of ventilation systems,
• innovative systems and market, and
• impact of the COVID-19 pandemic

This report documents all key performance indicators (KPI)s developed in the framework of Annex 80, relevant for the Annex 80 deliverables. Their application may be more precisely defined in the guidelines of specific task groups or Subtasks of Annex 80, e.g. in the simulation guideline or in the case study document. 

This report summarizes the structure and the outcomes of Annex 80 – Resilient Cooling of Build-ings, which was conducted as a five-year international research project within the IEA Technical Collaboration Programme EBC – Energy in Buildings and Communities.  

The world is facing a rapid increase of cooling of buildings. This is driven by multiple factors,  such as urbanization and densification, climate change, power shortage, and elevated comfort expectations as well as economic growth, especially in hot and densely populated regions of  the world. The trend towards cooling seems inexorable. It is mandatory to guide this  development towards sustainable solutions.  

This midterm report sums up the developments of Annex 80 between October 2019 and July 2021. Commencing with an initial Expert Meeting held in person in Vienna, Austria, subsequent work efforts by the Operating Agent (OA) and its team included conference calls and the second through fourth Expert Meetings which were held online due to the COVID-19 pandemic. 75 participants from 17 countries and 36 institutions actively took part in the fourth Expert Meeting. 22 institutions confirmed their participation with official letters in the first half of the Annex working phase. 

The world is facing a rapid increase of air conditioning of buildings. This is being driven by multiple factors, such as urbanization and densification, climate change and elevated comfort expectations as well as economic growth in hot and densely populated regions of the world. The trend toward cooling seems inexorable. It is imperative to steer this development towards sustainable solutions. 

This IEA Annex 80 Subtask C report and the associated brochures provide examples of well-documented field studies. These field studies apply resilient cooling technologies to reduce energy demand and carbon emissions for cooling and reduce the overheating risk in different types of buildings, including newly constructed and existing buildings. Examples and details on building information, energy systems, resilient cooling technologies, key performance indicators (KPIs), and performance evaluation and lessons learned are included in the report and the brochures.

This report summarizes an assessment of current State-of-the Art resilient cooling strategies and technologies. It is a result of a collaborative work conducted by participants members of IEA EBC Annex 80. This report consists of four chapters.

The current trend in most Western countries regarding building ventilation is to follow the “build tight, ventilate right” strategy. New energy efficient buildings are indeed getting more and more airtight to avoid energy losses through uncontrolled air leakages. Instead of relying on natural infiltration, ventilation systems are installed to ensure a good indoor air quality (IAQ) with controlled ventilative air flowrates.

AIVC's Ventilation Information Paper #45.12 summarizes current knowledge on trends in building and ductwork airtightness in USA.