Thomas Auer keynote speaker theme Circularity

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We are excited to announce Professor Thomas Auer as one of our speakers on the theme Circularity! Prof. Auer is managing director of Transsolar, Stuttgart. The Climate Engineering practice has received international attention over the last three decades and is working on all scales from single buildings to urban neighbourhoods. As Professor and Chair of Building Technology and Climate Responsive Design at the Department of Architecture of TU Munich, he focuses on a holistic design approach. For buildings and cities, it is crucial to recognize the sustainability goals of the EU as well as the reduction of substantial CO2 emissions in the building sector, as defining parameter.

Prof. Auer and Transsolar have always advocated an understanding of energy efficiency that goes beyond technology. They develop holistic concepts that incorporate the urban and regional scale. The overall objective of this approach is to create maximum comfort in the interior as well as in the exterior of the built environment while minimizing the use of resources at the same time. Prof. Auer works in interdisciplinary teams and has established a three-step approach comprising space design, building performance design and infrastructure design.


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Circularity: narrowing, slowing and closing flows

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Article from REHVA Journal 1, 2022 – Dr. ing. Olaf Oosting, managing Director at Valstar Simonis; Dr. ing. Tillmann Klein, circularity expert at Delft University of Technology; Dr. ing. Bob Geldermans, Building Product Innovation Professor at Delft University of Technology.

Due to a globally growing population and the need for comfortable and healthy indoor environments, a huge building challenge lies ahead of us, mainly related to the development of new building projects and the need to upgrade the existing building stock. To ensure a future-proof, sustainable economy for future generations, reducting the use of primary resources is essential. Therefore, there is a need for a shift from linear to circular systems. Circularity aims at narrowing, slowing and/or closing material, water, and energy flows (Boeken et al. 2015).

The HVAC sector certainly has great potential to contribute to circularity. Cydes of energy, air and water f1ows form the core business. Service installations and components are often subject to maintenance or replacement. Here, the preservation and reuse of valuable components offer considerable opportunities, both from an environmental point of view and from a user comfort and business perspective.

The mentioned opportunities and benefits have, at least for the time being, not translated into a large-scale market breakthrough. The sector needs a clear vision on realising circularity targets, based on innovative strategies and an integrated approach on the area of circular design, product technology, business models and administration & management. Few examples of these four strategies, are as follows.

Examples of circular design: Design for disassembly; Product life cycle strategies; Product functionality; Building design; Environmental assessment of circular components.

With the CSP Panel (particular PCM panel), PCM Technology has introduced a phase change material with Cradle to Cradle Silver certification to the market (Source: Phase change materials either store heat or release it, when their physical condition changes, allowing them to generate more consistent room temperatures. The panels are built into walls or ceiling surfaces.

To attain the CZC Silver certification, the entire production process of the CSP Panel has been checked for health aspects and reusability of the material, as well as for (green) energy use, water use and social justice. Circularity is therefore part of an integral methodology.

Examples of product technology: Biological, technical and critical materials; Reuse and remanufacturing of components; Circular maintenance; Product and material tracking; Sandards and regulations

Since 2018 Carrier has been committed to setting up and tracking material passports for (a series of) air heat pumps. This venture immediately showed how complex the issue can be for installation components. The process took a considerable time, partly as a result of the long supply chain, the complexity of the products or the quantity and materials and origin.

Unlike a concrete shell or wooden frame, an installation component consists of a large variety of materials. Taking stock of these materials offers the possibility of generating a dettailed LCA and thus providing products with better labesl in the  National Environmental Database (NMD). Most installation products in the NMD have a so-called generic category 3 label. This entails a conservative estimate of the LCA and an additional penalty of 30% to ensure that the results are not presented too positively. Within the framework of the MPG requirement, which has been tightened since 1 July 2021, imroving data quality is therefore an attractive circular initiative and a basis for creating circular awareness.

A second example that contributes to increasing awareness and defining materials and raw materials, is Madaster (see|), the so-called registry for materials. Madaster offers a platform to record and store properties, quantities, locations and characteristics in a structured way.

Examples of business models: Value proposition; Total cost of ownership; Total benefits of ownership; Legal and safety aspects; New models of ownership; Strategies for product services

One of the best-known examples in the field of installation technology that is provided ‘As a Service’ is ‘Light as a Service’, where Philips Lighting (now Signify) was the first party to offer light instead of lighting. Philips remains the owner of the LED lighting fixtures and lamps and charges an amount per quantity lux or burning hours delivered.

Also, the first ‘Lift as a Service’ concept was delivered in Circl, the ABN Ambro pavilioin on Zuidas in Amsterdam. Here, Mitsubishi launched its M-Use concept. It is a circular model for lifts, which charges for use rather than a traditional purchase and maintanance subscription.

This ‘product as a service’ model avoids high investment costs for the customer, and reuse and recycling are the priority at the end of the lift’s service life. The handling of materials and effective lift maintenance can therefore lead to a longer service life compared to bought lifts, which in turn can contribute to the strategy of delai. The well-known principle of an Energy Service Company (ESCo) can also be described as a Heat As A Service proposition. The big difference here, however, is that an ESCo is rarely, if ever, the producer of the products and thus differs from the regular As a Service proposition.

Examples of administration & Management: Supply chain management; Reverse logistics; Engagement of stakeholders; Responsibility of producer responsibility; Business operations, facilities and resources; Policy

In October 2018, Grundfos and Technische Unie took the initiative to collect old pumps for recycling. Collecting the pumps is a start to realising a circular production process. The take-back strategy that the parties have set up together has reduced the material impact, as materals taken from the pumps are no longer destroyed.

Old pumps were previously partially recycled at a traditional waste disposal facility. But here, not all the material from the pumps could be reused. By choosing to take back and reus and/or recycle the pumps, the percentage of reused material from these old pumps is over 97%. That is 10% more than with a traditional waste management company. Wilo has also developed a similar programme, where the look at each pump to decide which parts can be reused or recycled. In 2020, for example, 223,000 magnets had been reused, according to the company. They do this, on the one hand, to avoid limiting the quantity of primary raw materials and, on the other hand, to ensure the quality of the supply of raw materials. Both are concrete examples of the closing and regeneration strategy.

Read this article in REHVA Journal 1

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Buildings and systems must show resilience in the long and short term

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Article from REHVA Journal 1, 2022 – Prof. dr. Philomena M. Bluyssen, Delft University of Technology; Dr. AnneMarie Eijkelenboom, EGM Architecten

Health and comfort of people in the built environment, at home, at work, at school, commuting or during leisure time is a complex matter involving physics, behaviour, physiology, energy use, climate change, architecture, engineering, and technology. The way people feel, experience, and behave is related to the quality of their environment, described by the thermal, air, light and sound qualities. In addition, the resilience of buildings and systems to changing demands and preferences and the ability of people to respond to new buildings and systems affect their perception and behaviour. 

Studies worldwide show that relationships between the indoor environmental conditions (thermal aspects, indoor air quality, light and sound) and well-being (health and comfort) of occupants of office buildings, schools, homes, and hospitals are complex, and not easy to unravel. There are many indoor environmental stressors that can affect health and comfort either additively or through complex interactions. These include thermal aspects (e.g., draught, temperature), visual aspects (e.g., reflection, view, luminance ratios), air quality (e.g., odours, moisture, mould, radioactive radiation, chemical compounds, particulates), and acoustical aspects (e.g., noise and vibration). There are many diseases and disorders related to staying indoors, such as mental illnesses, obesity, cardiovascular and chronic respiratory diseases (think of asthma in children and COPD in adults), cancer, and COVID-19. The COVID pandemic has shown that buildings and systems must be able to provide a resilient environment not only in the long term (with regards to climate change) but also in the short term (during a pandemic, for example).

Ventilation to reduce infectious diseases
If we assume that airborne transmission of SARS-CoV-2 is a serious route of transmission, it is clear that it is not just a question of how much ventilation is required, but also how to ventilate in different situations. ‘Good’ or proper ventilation means, first of all, to provide sufficient and effective ventilation. Ventilation that ensures the supply of ‘clean’ air and exhaust of polluted (infected) air from the breathing zone of each individual person. Preferably, without passing through the breathing zones of other persons, and without recirculation (reusing) of air. If general ventilation is not enough or recirculation cannot be avoided, air cleaning is an option.

How much ventilation is needed? This is not an easy question to answer. Current guidelines for spaces occupied by multiple persons are based on the CO2 concentration in the air. CO2 is used as an indicator for the presence of people. With each breath, CO2 is exhaled. However, it is not clear whether CO2 is a good indicator for exhaled ‘infectious’ aerosols, because CO2 is a gas, and exhaled droplets and aerosols are not. This raises many questions about the correct methods for determining threshold limit values for the amount of ventilation. Do aerosols and exhaled droplets behave like gases or do they behave differently? Are there other models we can use if CO2 is not a good indicator for exhaled infectious aerosols?

Indoor environmental quality in energy-efficient & refurbished buildings
In addition, we must not forget that ‘infectious’ aerosols are not the only possible pollutants present in a space. The debate about other sources of pollution than the presence of people in a space has been going on for a long time, such as emissions of building and furnishing materials, outdoor air pollutants, or pollutants from poorly maintained ventilation systems, as well as all those volatile organic compounds and particles that are released during the activities that we carry out in our homes, offices or other buildings. We must also consider the effects that measures taken to improve ventilation may have on other aspects of the indoor environment. Think about how opening a window introduces outside noise and allows cold air to flow inside. Last winter, many children at school sat in chilly classrooms with all the windows and doors open to get as much fresh air as possible. There were also more problems with noise, caused by the airflow in the supply ducts, because systems were running at their maximum. Moreover, draughts can occur if the supply grilles are not properly adjusted.

In addition, research shows that buildings renovated to address climate change can pose a serious risk to the health and comfort of their occupants. Respiratory, eye and skin problems can occur as a result of certain renovation measures. Insulating and making our buildings airtight can lead to moisture problems, build-up of air pollutants, lack of control, noise and/or overheating. HVAC-systems, although efficient, can cause air pollution, draught, and noise.

Research also shows that such measures do not always yield the desired energy savings. This is partly due to the residents and their behaviour, and partly due to the technologies used and their feedback systems. When renovating energy-efficiently, it is therefore important to take into account the preferences and needs of the occupants.

Flexible systems and climate-resistant buildings
It is important to re-think the way we ventilate, specifically for indoor areas with a hogh density of people during a long period of shared time, such as in classrooms, landscape offices, restaurants, nursing homes, theatres, sports clubs, etc. The new generation of ventilation systems should not just focus on ventilating a space but should offer a range of options so that the changing demands of occupants over time can be met, be it for health or comfort. Flexibility is therefore the key. The COVID pandemic has shown us that more knowledge is needed about the way potential pathogens spread within buildings, about the best conditions and ways to fight infections, as well as ways to create affordable, flexible, energy-efficient, and effective ventilation. The need for related research is obvious. Collaboration between different disciplines, such as epidemiologists, virologists, aerosol experts, structural engineers, architects, psychologists, sociologists, and mechanical engineers is indispensable. The fight against future diseases will have to be taken up together with the challenges that climate change poses to the built environment.

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Professor Lieve Helsen keynote speaker theme Energy

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We are so excited to annnounce that Lieve Helsen will be joining us as keynote speaker for theme Energy. Helsen is Professor in Mechanical Engineering (KU Leuven & EnergyVille), leading the Thermal Systems Simulation (The SySi) research group, focusing on modelling, optimal control and optimal design of thermal systems in the built environment. As chairwoman Lieve established the Flanders Heat Pump Platform in 2008 and organised multiple highly-attended local Heat Pump Symposia that stimulated interaction between researchers and practitioners. In 2021 she acted as Conference Chair of the 17th International Building Simulation Conference of IBPSA in Bruges. She is member of the Royal Flemish Academy of Belgium for Science and the Arts, ODE Board of Directors, IBPSA-NVL, ATIC, IEA-HPT, EHPA, the Steering Group of the Flanders Heat Pump Platform, the International Scientific Committee of the ZEN Center at NTNU and UCEEB at TUPrague, core-member of EnergyVille, spokesperson of Moonshot Energy Innovation Core Team and nominated as member of AcademiaNet, which is The Portal to Excellent Women Academics.

The subject of Helsen’s speech on Tuesday, May 24th will be: Towards net zero CO2 emission in the built environment – a system of systems approach.

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REHVA’S 14th HVAC World Congress is ready to go

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Visit CLIMA 2022From 22 until 25 May 2022, TVVL (Dutch Society for Building Services and Technology), and the Technical Universities of Delft and Eindhoven are organising the 14th REHVA HVAC World Congress CLIMA 2022 in Rotterdam. “Although times are still uncertain due to the Covid-19 pandemic, all the conditions have been met to make the congress a great success. We have put together a wonderful preliminary programme. In terms of content, we are working on a lineup of top speakers, innovative workshops and high-profile presentations. In addition, we will provide an unparalleled social and cultural programme.”


Atze Boerstra, congress president and Lada Hensen Centnerová, one of the two vice presidents, exude confidence in their update on the organisation: “Both the programme and organisational matters for welcoming all the guests are well on track. Our core objective is to make CLIMA 2022 the most versatile and diverse congress ever organised for REHVA. Those that attend the congress will notice this in its content, form and also in the supporting programme of social events and activities. Apart from that, it goes without saying that we take all the Covid-19 measures we deem necessary – and that is more than our government prescribes – to ensure the safety and health of all the guests”, says Atze Boerstra.


Opening keynote speech
During the interview, in November 2021, Boerstra and Hensen Centnerová reveal that the programme is shaping up. It will be highly engaging for academics specialized in building technology as well as for representatives of manufacturers, installers, consulting engineers, HVAC system designers, property developers and facility managers. The 14th HVAC World Congress starts on Sunday with special excursions in Rotterdam and an exciting opening event in the afternoon. To this end, Marjan Minnesma will give a stimulating opening keynote speech. Marjan is director of the Dutch Urgenda Foundation, an organisation that successfully took legal action to force the Dutch government to take faster and more drastic measures to combat climate change. She is the most influential person in the Netherlands when it comes to putting and keeping energy transition on the agenda.


Please read the full article in REHVA Journal 6 2021



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Dr. Clayton Miller keynote speaker theme Digitization

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We are excited to annnounce Dr. Clayton Miller as one of our keynote speakers for theme Digitzation. Dr. Miller is an Assistant Professor at the National University of Singapore (NUS) in the Department of the Built Environment. He is the creator of the EDx MOOC Course – Data Science for Construction, Architecture and Engineering that has more than 20,000 participants worldwide since April 2020. He is also the leader of the Building and Urban Data Science (BUDS) Lab at NUS and the Co-Leader of Subtask 4 of the IEA Annex 79 Occupant-Centric Building Design and Operation. Miller’s research focuses on performance data analytics using thousands of real-world case study buildings collected from facilities around the world. His team leads the development of the smartwatch-based Cozie wellness and comfort data collection open source project, the ASHRAE Great Energy Predictor III Kaggle competition, and the SpaceMatch activity-based workstation optimization platform.

On Wednesday, May 25th Dr. Miller will discuss the importance of open data for the development of robust machine learning in the building industry and how we can catch up to other sectors that have transformed due to data science. He will discuss his mission to introduce basic data science skills to built environment professionals and help steer the two domains towards each other.

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Halton gives insights on CLIMA theme Health & Comfort

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Interview with Tarja Takki-Halttunen

CLIMA 2022 has it’s EYE ON 2030. As Halton Group is sponsor for the theme Health & Comfort we have asked Tarja Takki-Halttunen, co-owner and Vice Chair of the Board at Halton, to share her thoughts on 2030. How does Halton think the world of HVAC, especially with regards to Health & Comfort, will evolve, which insights do they have and does Halton have answers or solutions when it comes to the challenges we are facing? These are some of the questions Takki-Halttunen will answer.

As sponsor for the theme Health & Comfort of CLIMA 2022; what is your view on 2030? How does Halton think the world of HVAC, especially with regards to Health & Comfort, will evolve and how does Halton play a role in this?
“The COVID-19 pandemic has increased the importance of health and comfort indoors and pushed actors in the built environment to seek solutions for improving the air quality. Sustainability will play a much greater role in the coming years”, says Takki-Halttunen.

”Besides energy efficiency, the HVAC sector needs to pay attention to using carbon-free energy sources. Creating a high-quality indoor climate should not burden the environment. The selection of the energy source will be closely connected to the selection of the HVAC systems ”, continues Takki-Halttunen.

“The pandemic has accelerated the change of how we use buildings. Spaces need to be attractive for knowledge employees to leave their home offices. The indoor environment has therefore become a competitive factor for employers. Spaces have to be more flexible and adaptable”, concludes Takki-Halttunen.

Which insights does Halton have with regards to Health & Comfort?
“Halton is a global technology leader in demanding indoor environments, ranging from commercial kitchens, restaurants, offices and hospitals to cruise ships and power plants, with an aim to ensure human safety and wellbeing”, notes Takki-Halttunen.

” As buildings consume around 40% of all energy it is more and more important to use the available spaces as effectively as possible. Energy efficiency alone is not enough. It does not make sense to maintain buildings that are only partly occupied. High-quality spaces will replace deteriorated indoor environments. This will increase the demand for better HVAC systems”, summarizes Takki-Halttunen.

“Creating a high-quality indoor climate should not burden the environment.
The selection of the energy source will be closely connected to the selection of the HVAC systems.”

Does Halton have a solution/answer or is Halton part of any (international) initiative trying to find answers/innovative solutions for the challenges we are facing with regards to Health & Comfort?
“Our portfolio includes complete indoor environmental solutions as well as local air purification units. Halton is also part of the Finnish E3 Excellence in Pandemic Response and Enterprise Solutions joint project, to further help develop solutions and deepen our knowledge in pandemic response”, describes Takki-Halttunen. “We have also invested in several start-ups focusing on improving health and comfort in the built environment.”

What is the link for Halton with CLIMA 2022? What can the CLIMA visitor expect from your participation?
“Halton is an active supporter of Clima. Halton has submitted and participated in a handful of white papers to the conference and our specialists look forward to presenting the topics in Rotterdam. Our topics include themes such as thermal comfort by active ceiling diffusers with radiant panels, energy efficiency and indoor climate benefits of demand-based ventilation, and contaminant removal efficiency with night-time ventilation “, says Takki-Halttunen.

Why has Halton decided to sponsor CLIMA 2022?
“Clima, the leading conference in the global HVAC field, combines the latest research and innovations for better indoor environments. Halton acknowledges the great importance of joint efforts to improve the Health & Comfort with a sustainable angle”, concludes Takki-Halttunen.



Tarja Takki-Halttunen graduated with Master’s degree in engineering in 1988 from the Helsinki University of Technology (currently Aalto Uni) majoring in HVAC and information technology. Her thesis focused on the air cleanliness and air distribution methods in operating theatres. She is the co-owner and Vice Chair of the Board in Halton Group. Tarja has been serving Halton Group in many executive roles: Managing Director of SBA Halton responsible for 60 million € business in 20 countries, Director of New Ventures Business Area, Director of Global Business Development Program, and Director of Logistics and Information Systems. She is currently based in Finland and has also worked in the USA for six years. Tarja founded Indoorium Oy in 2001 and was HVAC Consultant at EKONO Oy in 1980s. She serves on the boards of two technology start-up companies. She also serves on the board of Technology Industry Employers of Finland.


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Dr. Arsen Melikov keynote speaker theme Health & Comfort

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We are proud to announce Dr. Arsen Melikov as keynote lecturer theme Health & Comfort. Melikov, Fellow ASHRAE, Fellow ISIAQ, is professor at the International Centre for Indoor Environment and Energy, Technical University of Denmark. His teaching and research areas cover advanced air distribution in rooms and vehicle compartments, airborne cross-infection, impact of indoor environment on people’s health, comfort and performance, personally controlled environment, heat and mass transfer, indoor climate measurements and instruments. The results of his research are included in engineering handbooks and guidelines as well as in International, European and national standards. He has been principle investigator of 60 research projects sponsored by government and private organizations in numerous countries. New HVAC technologies and measuring instruments have been developed based on his collaboration with industry. He has supervised 30 PhD students and more than 110 MSc students. Prof. Melikov is author and co-author of more than 400 scientific papers published in 15 languages. He has given 60 invited lectures. He has received numerous awards, including the Rydberg Gould Medal of The Scandinavian Federation of Heating, Ventilation and Sanitary Engineering Associations in Denmark, Finland, Iceland, Norway and Sweden .

Dr. Melikov will give a presentation on Monday, May 23rd with the title: Focus on occupants, energy and airborne cross-infection: paradigm shift in ventilation is needed!!


Check the preliminary program

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Digitization of the installation sector: Towards predictive smart buildings!

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Article from REHVA Journal 6, 2021 – Jan Kerdèl, senior consultant, Kerdèl Business Development; Pieter Pauwels, dr. Ir.-arch, TU Eindhoven

The installation sector is digitalising! As in the rest of the building industry, systems digitization and innovation have an increasing impact on the HVAC and installation sector. Far-reaching evolutions towards ‘digital twins’ and ‘smart buildings’, including predictive maintenance strategies and centrally linked systems, mean that the installation sector faces the next wave of digitization, or rather an AI (r)evolution.

Partly for this reason, ‘digitization’ is an important topic at the upcoming REHVA World Congress CLIMA 2022, the leading international scientific congress in the field of heating, ventilation and air conditioning (HVAC). The congress is organised every three years by one of the member associations of REHVA. The upcoming edition will be organised by TVVL in the Netherlands, in cooperation with Delft University of Technology and Eindhoven University of Technology. In addition to Digitization, CLIMA 2022 also covers the topics of Energy, Circularity, Health & Comfort, and Education.

How will current demands and influences evolve until 2030? What insights will we gain? How do the topics relate to each other? Will they reinforce each other or slow each other down? And how does the impact of climate systems relate to the building process and other influencing factors? What kind of teaching and learning is needed? With these questions in mind, CLIMA 2022 will have its EYE ON 2030.

Digitization is, therefore, an important topic at CLIMA 2022. However, typically digitization is not a stand-alone topic: it is often part of larger issues. No doubt other conference topics will use digitization to carry out complex research or solve certain issues. Digitization also plays an undeniable role in the design and operation of installations. And here, too, it typically serves specific purposes (e.g. system optimisation). In the following we provide a brief overview of the most important developments of this form of digitization for the HVAC sector.

Digital solutions that stimulate the energy transition in the built environment are a crucial topic. In many companies and organisations, solutions in the field of (predictive) digital twinning, data-driven smart buildings, data management, and continuous commissioning are high on the agenda.

Nowadays, digital solutions must be able to handle a wide range of HVAC systems and be self-learning in detecting trends and process deviations. While current systems often concentrate on monitoring, it is becoming clear that the future lies in predictive planning of interventions based on recommendations from an Al system.

It is expected that in an actual, physical building (physical twin in Fig. 1), several sensors and actuators will actively monitor data. In this environment, monitoring and surveillance are therefore carried out in a data-driven manner. On the other hand, the digital side means a virtual model (digital twin) that is usually strongly model-based. An information model and/or prediction model (e.g. neural network) is digitally available, including a number of simulated scenarios. These are compared to the input from the data-driven physical twin. Such comparisons make it possible to work on prediction, fault detection and self-learning (Fig. 1). In this way, model-based and data-driven approaches are combined, making for a powerful potential resource and important Al research topic, that can also be employed for HVAC systems.

The above-mentioned ambitions put the evolution towards dynamic HVAC systems under digitization pressure. Stand-alone or integrated solutions are possible, and a system and environment as shown in Fig. 1 is certainly achievable and already a reality in several places. However, there are some important preconditions or even obstacles for placing such systems on the market in a scalable way (performance, cost, speed):

  • System architectures must be able to cope with large-scale implementation with various hardware (wired and wireless solutions, loT, cloud solutions, blockchain technologies), and at the same time, they must be flexible to continuously accommodate change (additional sensors, new users, change of provider, etc.).
  • In addition to these large-scale and flexible infrastructures, the world of smart buildings also requires monitoring strategies that bridge the gap between building automation and control systems (BACS) and building information modelling (BIM) tools.
  • Also, the recent COVID pandemic has led to research into digital-oriented design, monitoring and control of ventilation systems related to general comfort and health. This includes machine learning (ML) algorithms for fault detection and diagnosis, pattern recognition and anomaly detection: training a model based on sensor data; model-based prediction; intervention in the building system.

With the above evolutions in the HVAC field, the lifecycle costs of a building are expected to be easier to control, the comfort of the occupant or user will improve, and the system will be easier to monitor and maintain.

Building management systems for energy performance innovations are a prerequisite for better performing buildings. These are buildings that adapt to the changing climate, provide optimum comfort in an intelligent manner and, ideally, also produce energy (net positive buildings). The innovations are primarily expected from the building management system (BMS), which maintains a central reference point for a specific building (model-based and data-driven – Fig. 1). Based on this, a building management system can actively carry out interventions in the building.

Positive energy should also become possible in the field of energy management for buildings. Solutions in this direction are expected in the areas of (predictive) digital twinning and data-driven smart buildings, in which building performance is monitored and displayed in real time through dashboards that relate building data and measured values (time series). Recent developments link this to information models and metadata standards for data management such as the Industry Foundation Classes (IFC), Linked Building Data (LBD), Brick, and Haystack.

The latest developments are:

  • Energy transition measures for existing buildings
  • Net positive building developments
  • Building performance monitoring with digital twins
  • Data-driven smart buildings: monitoring based on time series data
  • Linked building data for digital twinning (LBD, Brick, Haystack, etc.)


Design for automation: from SIM models to BACS
Typically, there is a Building Information Model or BIM model available for modern buildings. Such a semantic 3D model allows architects, engineers and building professionals to plan, design, build and manage a building better and more efficiently. However, the BIM model is usually limited to the design and construction phase. This means that valuable information in the operational phase is either collected by another dedicated management system or (not infrequently) lost.

Research and development are trying to close the gap that still exists between BIM and Building Automation and Control Systems (BACS). The information available in the BIM design model could form an excellent basis for the start-up and design of the control technology in a BACS. Since the orientation of the building, the use of space, the intended use and the desired comfort classes are known, SIM routines could be developed to suggest BACS solutions and control strategies. Monitoring strategies should follow to maintain quality and control costs throughout the lifecycle. Hereby, information from SIM models can become a basic reference for cost control over the lifecycle of a building.


The latest developments:

  • BIM for indoor climate control design
  • Building automation design from BIM environments (BIM & BACS)
  • Automation of maintenance and monitoring: self-sufficient buildings
  • From data to decision-making: standards and best practices
  • Facility management design
  • Digitization of design and engineering of HVAC installations


HVAC control and health monitoring
Particularly after the outbreak of the Covid pandemic, much research has focused on rethinking ventilation strategies and their design, monitoring and control. This leads to an intensive research project on the role of ventilation in comfort and health monitoring in a building. Within Clima2022, several contributions are expected around the digitization-focused research on the design, monitoring and control of ventilation in a building in case of a pandemic.

Furthermore, the use of Al techniques for this purpose is encouraged, in particular the use of Al algorithms for fault detection and diagnosis, but also pattern recognition and anomaly detection in building use and HVAC systems. It is important to use these digital technologies for critical control and risk mitigation strategies, rather than signaling every minimal error or deviation within tolerances.

Rather than displaying all available information, the key question is how these techniques can be used to proactively predict where and how systems will fail and how this risk can be mitigated.


The latest developments are:

  • Ventilation strategies in pandemics (design, monitoring, control)
  • Health and comfort monitoring
  • Pattern recognition and anomaly detection in building use
  • Algorithms for fault detection and diagnosis
  • AI for critical control and risk mitigation strategies (proactive vs. reactive)


Integration in existing buildings: Upgrade of buildings
Buildings and the energy infrastructure are undergoing a transition to a carbon-free society by the year 2050 (Paris Agreement 2015). The approach differs from country to country: in countries with a temperate climate, the building envelope is often of insufficient quality and requires renovation or upgrading. In addition, low temperature (LT) heating and cooling solutions are often implemented, even though they are more sensitive to failures. In order to deploy these systems appropriately and make renovation possible, large-scale monitoring at an affordable cost must be developed to continuously monitor commercial buildings.

Research on this topic typically focuses on the process of building improvement and poses new challenges for building management; this topic is thus also expected to be discussed at Clima 2022. Solutions must be able to handle a wide range of HVAC systems and be self-learning in detecting trends and process deviations. In renovating and implementing systems, system architectures must include large-scale implementation. Both wired and wireless solutions are possible, and in the case of implementing loT in a renovated building, a professional approach to loT (lIoT as a quality standard) is recommended (lowest risk level).

The latest developments are:

  • loT and industrial loT
  • Cloud solutions for building management (e.g. Kubernetes, MS Azure)
  • Security, control and authorisation in cloud-based BMS systems
  • Edge computing: on-device computing for building automation
  • LoRa and LoRaWAN: training connected and loT devices
  • Local area networks, WiFi networks and 5G networks in embedded infrastructure


Read this article in REHVA Journal 6


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Marjan Minnesma keynote speaker at opening ceremony

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We are excited to announce Marjan Minnesma as keynote lecturer at the opening ceremony of CLIMA 2022 on Sunday, May 22nd 2022. Marjan is director of the Urgenda Foundation, an organization that successfully realized a ruling by the Dutch Supreme Court, finding that the Dutch government is required to take faster and more drastic measures to combat climate change. Marjan has been named the most influential person working in the field of sustainability in the Netherlands three years in a row. In 2015 she was declared to be a ‘leading global thinker’ by the authoritative American magazine Foreign Policy.

“Marjan Minnesma wrote the report and agenda for the Netherlands: “100% sustainable energy in the Netherlands in 2030; It is possible, if we really want to” including all figures and pathways for the next fifteen years. Therefore we feel she is the best person to open the scientific programme of CLIMA 2022 and introduce our overall theme: EYE ON 2030,” says Atze Boerstra, Congress President of CLIMA 2022. “As the program is getting more and more concrete CLIMA 2022 promises to be an attractive event for academics as well as for representatives of manufacturers, installers, consulting engineers and clients. In fact, our goal is to make CLIMA 2022 the most versatile and varied congress ever organized for REHVA.”


Check the preliminary program


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