domOS approach

Digitisation in existing buildings is not as widespread as in other sectors. A consequence is that buildings owners and occupants have generally a limited understanding of their building as an energy system. Improving the energy efficiency of existing buildings can and should be achieved through deep renovation. In comparison, smart technologies can increase the efficiency and the flexibility of buildings in a shorter term and with much less investments. The domOS project addresses the smart building sector through two axes:

In the first axis, technology, guidelines for an open, secure, multi-service Internet of Things (IoT) ecosystem for smart buildings are defined: in-building gateways, which connect to local smart devices and smart appliance of any type, IoT platforms and applications operated by different parties can be integrated seamlessly. Buildings owners can enforce privacy rules, they can allow / forbid access to any measurement or control point.

The second axis deals with the development of smart services. They increase energy efficiency of space heating (heat pumps, district heating, gas boilers) thanks to innovative control algorithms making use of smart sensors and smart heating appliances. Automated advice services provide concise and sound information on the building energy. Buildings become active nodes of an electricity grid or a District Heating grid.


A building local communication network provides access to sensors data and smart devices / appliances to applications either hosted in the gateway or in the cloud.

1. Design an open, secure, multi-service Internet of Things (IoT) ecosystem for smart buildings:


Any application for visualisation, energy optimization, home automation… can access any field data, if authorisation is granted, independently of the local communication network technology.

Applications, together with the building local communication system, form the IoT ecosystem for buildings. Features of the IoT ecosystem for buildings:

  • Open: Multiple applications from different vendors can access building sensor data and / or control building set points.
  • Secure: Applications, users and gateways dispose of an integrated authentication and access control mechanisms. Facility managers (commercial buildings) or households (residential buildings) can control privacy: they decide which application has access to which data.
  • Multi-service: Several applications can access the building infrastructure in parallel. Access rights assign control capability for a set point to a unique application.

2. Enable interoperability of data and services for smart buildings through ontologies:


Applications and local communication systems share a common nomenclature (ontology) for field data (e.g. name for “instantaneous power for heat pump”) and building meta-data (“The air-water heat pump is used for domestic hot water preparation and space heating”).

Demonstrators requirements will drive the elaboration of the shared nomenclature. Existing ontologies will be evaluated and completed according to these requirements.

3. Increase energy performance through smart services:


Smart services make buildings more energy efficient, more flexible and gives more ?? to occupants and facility operators.

Increased energy efficiency:

  • Control based on distributed sensors and actuators increase the efficiency of space heating.
  • Detection of suboptimal configuration of heating appliances based on automated analysis of monitoring data.
  • Energy dashboard leading to a more energy conscious behaviour for occupants.

Increase flexibility:

  • Management of heating appliances for space heating and domestic hot water, electrical vehicle charging and battery energy storage. Techno-economic optimization: increased self-consumption at vertically nested systems (buildings, microgrids, local energy communities, distribution grids).
  • up to a Transmission System Operator’s (TSO) control zone), and
  • are deployed in the context of electricity and District Heating (DH) grids.

domOS will also design, deploy and evaluate smart services that aim at empowering users by increasing their level of understanding of their building as energy system and by providing them with tools that assess the consumption and suggest proposals for improvements.

4. Demonstrate and evaluate smart services deployed on IoT ecosystem compatible IoT frameworks

Smart services for existing buildings are deployed in several demonstration sites, using different frameworks compatible with the domOS IoT ecosystem specification. Their performance regarding technology, energy, user experience and business is assessed. Supported smart services:

  • have their intelligence either hosted on a building local gateway, in the cloud or mix,
  • relates to different types of buildings (tertiary / residential buildings, single-family / multiple family),
  • features dynamics ranging from one second to several hours,
  • enables any application to have read and/or write access to any input / output point in field devices / appliances, if users allow it,
  • integrate existing buildings in larger information systems, as those in use for energy grid operation and energy markets.

Consortium of partners

University of Applied Sciences and Arts, Western