Roland Bal keynote speaker at opening ceremony

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We are excited to announce Professor Roland Bal as keynote speaker at the opening ceremony of CLIMA 2022 on Sunday, May 22nd. Roland Bal is Professor at Erasmus School of Health Policy & Management and his main research interest lies in the building, functioning and consequences of knowledge infrastructures for the governance of healthcare. He currently focuses on organisational infrastructures for quality and safety in healthcare, such as studies on the regionalisation of elderly and mental healthcare and a study task differentiation of nursing care. Professor Bal has specialised in qualitative, mainly ethnographic research methods. He is a member of the Dutch research school of Science, Technology & Modern Culture and of the Society for the Social Study of Science. He also participates in the European Health Policy Group, a group of political scientists and economists studying (comparative) health policy.


Keynotes overview – Clima 2022

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Siemens joins the effort for digitalized HVAC by sponsoring CLIMA 2022

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We are excited to announce that Siemens has decided to support the 14th REHVA HVAC World Congress CLIMA 2022 by signing up as theme sponsor Digitization. Siemens Smart Infrastructure combines the real and digital worlds across energy systems, buildings and industries, enhancing the way people live and work and significantly improving efficiency and sustainability. The perfect link to CLIMA 2022, that will all be about meeting global climate goals and the massive HVAC transformation that is on the horizon. Besides the theme Digitization, CLIMA 2022 will therefore focus on the themes Energy, Circularity, Health & Comfort and Learning & Education. All with an EYE ON 2030.

Siemens is well known as global technology leader supporting sustainable development by driving innovation. ‘I am thrilled to have Siemens on board as this is another great step in the development of CLIMA 2022. Our core objective is to make CLIMA 2022 the most versatile and diverse congress ever organised for REHVA and with Siemens teaming up with us and the other (theme) sponsors in the run up to CLIMA 2022, I am more than confident that we will meet this objective,’ says Atze Boerstra, Congress President of CLIMA 2022.

Our purpose is to create more sustainable communities by leveraging the power of digitalization in real-estate. We focus our innovation power on transforming the building industry and solving our customers’ most pressing issues for the benefit of people, businesses and the generations to come.
Henning Sandfort, CEO Building Products at Siemens Smart infrastructure



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With 100+ years experience, Carrier is committed to what matters

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Interview with Didier Genois

As CLIMA 2022 is getting closer, we were keen on learning how main sponsor Carrier has it’s EYE ON 2030. How does Carrier Airconditioning think the world of HVAC will evolve and how does Carrier play a role in the influences that will change the current demands on climate installations completely? As Carrier has been leading the HVAC industry with innovative ideas for over 100 years we have asked Didier Genois, Vice President & General Manager Carrier HVAC Europe, to share some of their knowledge in the run up to CLIMA 2022.

Carrier is committed to what matters
Climate change is among the most significant issues facing humanity. HVAC contributes an estimated 15% of the world’s greenhouse gas emissions. Carrier recognizes the potential for smart, sustainable innovation, and is committed to setting science-based emissions targets aligned with the goals of the Paris Agreement.

  • Reduce our customers’ carbon footprint by more than 1 gigaton.
  • Invest over $2B to develop healthy, safe, sustainable and intelligent building and cold chain solutions that incorporate sustainable design principles and reduce lifecycle impacts.
  • Achieve carbon neutral operations.
  • Reduce energy intensity by 10% across our operations.
  • Achieve water neutrality in our operations prioritizing water-scarce locations.
  • Deliver zero waste to landfill from manufacturing locations.
  • Establish a responsible supply chain program and assess key factory suppliers against program criteria.


Which insights does Carrier have with regards to the 5 CLIMA themes? Can you highlight a few of them?

  • Health & Comfort
    Carrier’s Healthy Buildings Program provides an expanded suite of advanced solutions to help deliver healthier, safer, more efficient and productive indoor air quality regardless of your building type/indoor environment. From innovative products, controls and system design solutions to remote services including assessments, maintenance and re-commissioning, you can trust Carrier’s 100+ years of experience creating optimal indoor air environments to help you with yours.
  • Energy
    Carrier continues to develop solutions and technologies that reduce energy consumption and GHG emissions of our products in use. And we are actively engaged with regulatory authorities, trade associations and other stakeholders, working collaboratively to pursue and implement industry-wide policies and initiatives that drive sustainability by promoting greater energy efficiency and lower GHG emissions. We have consistently invested in energy-efficient technologies and solutions to assist our customers in lowering energy demand and associated GHG emissions, and measure the results from these investments.

    The reduction of energy consumption is also a focus in our production process. One of our environmental goals for 2030 is to reduce energy intensity by 10% across our operations. We are very proud of our renovated the test lab in our Montluel, France, facility, where we make and test chillers. The renovations included the installation of our high-efficiency AquaForce chillers, which are variable speed drive chillers optimized by our controls to adapt to energy need and operating conditions, such as weather. We also shifted the refrigerant used to a lower global warming potential and nonflammable refrigerant, R-515B, and installed our energyefficient dry coolers, which replaced cooling towers that have been dismantled. The renovation resulted in a 25% reduction in the facility’s annual energy consumption and the reduction of water use by nearly 1.2 million gallons per year in the test lab.

  • Digitalization
    Carrier is increasingly investing in digital solutions. The most recent investment is the digital platform Abound. This platform is designed to give people confidence in the health and safety of their indoor environments. It is an open technology platform that aggregates data from different systems and sensors and provides building owners, operators, and occupants transparency into relevant and contextual insights about air quality, thermal comfort, and other performance data. This way, we offer our customers a digital solution to tap into and translate data, to make their building environment more intelligent, efficient and responsive.

“We believe knowledge has value if we share it with each other.
This edition of the congress comes at a very crucial moment for our HVAC world.”

As CLIMA 2022 is a scientific congress; what would you like to get out of this event? Not (just) when it comes to business opportunities, but especially in relation to how to face the challenges ahead of us?
We believe knowledge has value if we share it with each other. This edition of the congress comes at a very crucial moment for our HVAC world. At Carrier, innovation has always been one of our core values. Our research & design centers provide our customers with the highest-performing, most efficient products and services. We actively share our expertise to promote environmental stewardship. To name an example; We were the first company to license the USGBC’s Leadership in Energy and Environmental Design® (LEED®) curriculum to train our employees and customers in sustainable building solutions and are proud to have been named a USGBC (U.S. Green Building Council) Education Partner. We look forward to share expertise with the brightest HVAC minds at CLIMA 2022.


Why has Carrier Airconditioning decided to sponsor CLIMA 2022?
Our HVAC world is experiencing change and a need for innovation more than ever before. Between now and 2030, we need answers in areas such as energy efficiency, circularity, digitization and health & comfort. Carrier has been leading the HVAC industry with innovative ideas for over 100 years, pursuing excellence in solutions that matter for people and planet. Let’s share our knowledge together at the REHVA World Congress CLIMA and provide answers crucial to our business.



Didier Genois is Vice President & General Manager for Carrier HVAC Europe since October 2018. In this role, Didier is responsible for leading the HVAC Europe Air Conditioning business with a specific focus on increasing our investments in innovation and our production equipment, accelerating digital innovation and business transformation, gaining segment share globally and ensuring our customers satisfaction.

He held business leadership roles over the course of 26 years. Didier joined UTC in 1994 as a Design Engineer and has since held a number of increasingly responsible positions including Director, Engineering & Marketing, Europe. Most recently, Didier served as Executive Director, Engineering, HVAC Europe Air Conditioning where he also had responsibility for the Marine business.

Didier holds a Master of Science in Mechanical Engineering from INSA Lyon, and a Master of Business Administration (MBA) from ESSEC Paris.

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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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