IAQ

In high-efficient residential buildings, energy use due to ventilation can reach 60% of the total building. Smart-ventilation systems with variable airflows adapting to the need of buildings and occupants can increase the energy performance of the building and at the same time improve or maintain IAQ. They are also considered as a huge opportunity for new and existing residential buildings. 

Efforts must be made to promote the use of efficient ventilation systems in buildings with the aim of reducing energy demand, as ventilation is a major source of energy loss. Nevertheless, the implementation of efficient ventilation systems is frequently constrained by regulations. It is therefore essential that governments and regulatory bodies facilitate and even encourage the use of appropriate solutions through the introduction of performance-based regulations. 

The protection from chronic harm provided by exposure limit values (ELVs) is evaluated for indoor air contaminants set by regulatory bodies of member countries in the Air Infiltration and Ventilation Centre (AIVC). Significant variability was found in the regulated harm levels from ELVs for the same contaminants across different countries, highlighting inconsistencies in public health protection. The concept of a regulated harm budget (RHB) is introduced, representing the total allowed harm from regulated contaminants implicitly set by a regulatory body.

The Book of Proceedings of the 43^rd AIVC - 11^th TightVent - 9^th venticool Conference: "Ventilation, IEQ and health in sustainable buildings" held in Copenhagen, Denmark on 4-5 October 2023.

The Presentations at the 43^rd AIVC - 11^th TightVent - 9^th venticool Conference: "Ventilation, IEQ and health in sustainable buildings" held in Copenhagen, Denmark on 4-5 October 2023.

In celebration of its 30th Anniversary in 2022, the International Society of Indoor Air Quality and Climate (ISIAQ) organized a groundbreaking webinar series that spanned the entire year. This series brought together esteemed researchers who have made significant contributions to the field of indoor air sciences, as well as young and promising researchers who are shaping the future of research in this domain.

On June 24, 2023, ASHRAE approved the publication of Standard 241-2023 Control of Infectious Aerosols. The purpose of Standard 241 is “to establish minimum requirements for control of infectious aerosols to reduce risk of disease transmission in the occupiable space” of buildings by defining “the amount of equivalent clean airflow necessary to substantially reduce the risk of disease transmission during infection risk management mode”.

The presentation provides a brief overview of the current situation and a roadmap for decarbonizing the building stock under the context of EU directives. It also discusses how it could be implemented into Spanish building regulations. It examines the evolution of energy and emissions indicators and how they can help tackle the electrification of uses, generalized on-site energy generation, energy storage or building interaction with the grid.