NILIM and BRI of Japan, together with the Air Infiltration and Ventilation Centre (AIVC) organised a workshop entitled “Towards high quality, low-carbon ventilation in airtight buildings" held on 18-19 May 2023 in Tokyo, Japan.
The 2-day workshop provided the opportunity to Japanese researchers and engineers, as well as international experts visiting Japan, to present and discuss recent developments in relation to ventilation and airtightness. The workshop was organized in 5 thematic sessions.
In the opening session, a representative of the ministry in charge of Japanese policies toward zero carbon buildings in 2030 and 2050 described the latest concrete policy measures including energy efficiency. Latest evolutions in regulations and standards on energy performance and ventilation in Europe and the US were also presented.
In the session for IEA EBC Annexes (international collaborative R&D projects), which are relevant to ventilation, latest outputs from 1) technologies for gas-phase air cleaning (Annex 78), 2) side-by-side management methods of indoor air quality and energy efficiency (Annex 86) and 3) personalized environmental control system technologies (Annex 87) were presented.
An airtight building envelope is essential especially in order to avoid heat loss due to air leakages. In non-residential buildings, in addition to wind and stack effects, air pressure caused by HVAC systems may worsen the heat loss due to the air leakages. However, it seems that effective techniques for improving the airtightness in non-residential buildings have not yet been shared enough among Japanese building engineers and researchers. Some existing approaches in Europe, North America and Japan and future perspectives for standardisation were discussed in the airtightness session.
In the session on approaches to search for more energy efficient and reliable ventilation systems, the latest standards for testing heat recovery effectiveness in laboratories were reviewed with test examples, in which key characteristics of products influential on the actual effectiveness were demonstrated. Characteristics of the Japanese market of energy recovery ventilators and improvements in the latest products were analyzed. Performance assessment of other energy efficient ventilation strategies and smart ventilation were also discussed.
In the session on the role of ventilation in infection control, a Japanese government proposal in July 2022 on effective ventilation to avoid infections by large aerosol and small floating aerosol diffusion was reviewed with some actual infection case studies. Also, the characteristics of aerosol transmission route of respiratory pathogens and their mitigation strategies were discussed by building physics researchers, who have been collaborating with medical experts in the committee dedicated to the Japanese infection control strategies. Other presentations discussed new developments in ventilation standards and regulations, and advances in measurement techniques.
|Day 1 – Thursday May 18th 2023|
Chairs: Takao Sawachi (BRI), Peter Wouters (INIVE)
|09:00||Welcome on behalf of NILIM||Takahiko Hasegawa (Deputy Director-General, NILIM, JP)||mp4|
|09:10||Welcome on behalf of BRI and overview of IEA-EBC||Takao Sawachi (EBC Executive Committee Chair, JP||mp4|
|09:20||Overview of AIVC, TightVent, venticool & IEQ-GA||Arnold Janssens (AIVC Operating Agent/INIVE/UGent, BE)||PPT||mp4|
|09:30||Japan’s Policy toward Carbon Neutrality in the Housing and Building Sectors||Takashi Imamura (Housing Bureau-MLIT, JP)||Abstract||PPT||mp4|
|09:55||Context and policies for energy and ventilation in Europe, new evolutions in EPBD||Jaap Hogeling (EPB/REHVA/ISSO, NL)||Abstract||PPT||mp4|
|10:20||Ventilation standards in the US||Iain Walker (LBNL, USA)||Abstract||PPT||mp4|
Chairs: Hilde Breesch (KU Leuven), Kazuhide Ito (Kyushu University)
|11:15||A general overview of IEA-EBC Annex 78: Supplementing ventilation with gas-phase air cleaning, implementation and energy implications||Pawel Wargocki (DTU, DK)||Abstract||PPT||mp4|
|11:30||International standardization of testing perceived air quality and the supporting information from in silico model for transport efficiency of acetone from indoor to olfactory epithelium cells||Kazuhide Ito (Kyushu University, JP)||Abstract||PPT||mp4|
|11:55||An update on IEA-EBC Annex 86: Energy efficient smart IAQ management in residential buildings||Jelle Laverge (UGent, BE)||Abstract||PPT||mp4|
|12:10||Dallying with DALYs: a harm-based approach to IAQ acceptability||Benjamin Jones (Nottingham University, UK)||Abstract||PPT||mp4|
|13:35||IEA-EBC Annex 87: Energy and indoor environmental quality Performance of Personalised Environmental Control Systems (PECS)||Bjarne Olesen (DTU, DK)||Abstract||PPT||mp4|
|13:50||Personal environment comfort system (PECS) for improving thermal comfort and IAQ in a zero energy building||Shin-ichi Tanabe (Waseda University, JP)||Abstract||PPT||mp4|
Quality assurance of ventilation and heat recovery systems
Chairs: Alireza Afshari (Aalborg University), Masaki Tajima (Toyohashi University of Technology)
|14:35||Actual effectiveness of energy/heat recovery ventilators in buildings: how is it influenced by key design factors and testing results (airflow, airflow ratio, unit exhaust air transfer ratio)?||Tetsutoshi Kan (Better Living, JP)||Abstract||PPT||mp4|
|15:00||Latest trends and technologies of energy recovery ventilators in Japan||Junichi Takahashi (Mitsubishi Electric co, JP)||Abstract||PPT||mp4|
|15:55||Performance assessment framework for smart ventilation systems||Hilde Breesch (KULeuven, BE)||Abstract||PPT||mp4|
|16:20||Effect of indoor temperature differences and zoning on the performance of energy efficient ventilation strategies for domestic buildings||Jelle Laverge (UGent, BE)||Abstract||PPT||mp4|
|17:05||End of Day 1|
|Day 2 – Friday May 19th 2023|
Chairs: Yu Wang (Branz), Hiroshi Yoshino (Tohoku University)
|09:00||Proposal to promote airtightness in non-residential buildings in Japan||Kiyoshi Hiwatashi (Taisei Corporation, JP)||Abstract||PPT||mp4|
|09:25||Trends in building and ductwork airtightness in different countries||Valérie Leprince (Cerema, FR)||Abstract||PPT||mp4|
|09:50||Airtightness testing of large buildings||Iain Walker (LBNL, USA)||Abstract||PPT||mp4|
|10:15||Measurement for exterior wall airtightness of high-rise buildings using stack effect/individual air conditioning and outdoor air entering through entrance doors||Yuichi Takemasa (Kajima Technical Research Institute, JP)||Abstract||PPT||mp4|
|11:10||Airtightness of large buildings in Japan: current situation and a proposal for the future||Takashi Hasegawa (Eikan-Shoji, JP)||Abstract||PPT||mp4|
|11:35||ISO 9972: An overview of difficulties with the current standard||Benedikt Koelsch (Cerema, FR)||Abstract||PPT||mp4|
|12:00||Durability of building airtightness||Valérie Leprince (Cerema, FR)||Abstract||PPT||mp4|
Role of ventilation in infection control
Chairs: Valérie Leprince (Cerema), U Yanagi (Kogakuin University)
|13:45||Aerosol transmission route of respiratory pathogens and their mitigation strategies||U. Yanagi (Kogakuin University, JP)||Abstract||PPT||mp4|
|14:10||Countermeasures against indoor aerosol infection in Japan||Motoya Hayashi (Hokkaido University, JP)||Abstract||PPT||mp4|
|14:35||Using pathogen-free air to reduce infection risks in buildings (pre-recorded presentation)||Chris Iddon, (UCL, UK)||Abstract||PPT||mp4|
|15:00||Revision of ISO17772-1 and EN16798-1 Standards dealing with indoor environmental quality||Bjarne Olesen (DTU, DK)||Abstract||PPT||mp4|
|15:55||Role of air cleaning in infection control||Pawel Wargocki (DTU, DK)||Abstract||PPT||mp4|
|16:20||Developing regulations to improve IAQ and ventilation in Belgian buildings||Peter Wouters (INIVE, BE) and Arnold Janssens (UGent, BE)||Abstract||PPT||mp4|
|16:45||Airtightness and internal air flows in multifamily buildings||Iain Walker (LBNL, USA)||Abstract||PPT||mp4|
|17:45||End of Day 2|
The workshop was organized by NILIM and BRI together with the Air Infiltration and Ventilation Centre (AIVC) and facilitated by INIVE (International Network for Information on Ventilation and Energy Performance).
The workshop took place at Bellesalle Mita Garden.