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ProKlim - Optimisation of Energy Efficiency of automated indoor climate systems by using weather forecasts
Investigation of the basic energy savings potential for buildings in commercial use by including weather forecasts as a variable. Additionally, a concept for integrating weather forecasts into the heating and air conditioning control systems in buildings is planned to be developed. Within the scope of the feasibility study, a detailed analysis of technological possibilities, including both hardware and software, will be conducted.
Titel und Synopse
ProKlim - Prognosegesteuerte Gebäudeklimatisierung
Energieeffizienzsteigerung in der automatisierten Gebäudeklimatisierung durch wetterprognoseunterstützte Regelung
Project description / tasks
Status
ongoing
Summary
Starting point / motivation
Using current weather information, such as outdoor temperature, to control heating and air conditioning in buildings has become standard procedure in building services engineering. However, only few facilities also use weather forecasts for controlling the indoor climate, even though this can help existing systems to save energy and reduce CO2 emissions relatively easily and inexpensively.
Contents and goals
Together with its project partner, the Austrian Institute of Technology (AIT), UBIMET will analyse the basic energy savings potential for industrial buildings by including weather forecasts as a variable. The magnitude of the savings potential (in form of saved energy, costs and CO2 equivalent) will also be calculated. In doing so, the savings potential will be separated regarding the factors forecast quality and savings owing to the geographical position. For the investigation, AIT will carry out thermodynamic building simulations for a test building in different regions of Austria. From the results, index numbers will be derived, quantifying the significance of the factors in terms of energy savings potential.
Additionally, the topic of integrating the weather forecasts into the building automation is of interest. Consequently, the second part of the study drafts a complete concept for integrating weather forecasts into the climate control systems of buildings. Within the scope of the feasibility study, the project partner ee-consult conducts a detailed analysis of the technological possibilities.
Recent results
In the current project status the AIT has modelled the test building ENERGYbase in Trnsys 17 very detailed. The validation of the modell was conducted with monitoring data from the building and is almost finalised. First simulations of scenarios showed that direct radiation is the meteorological parameter that influences the indoor temperature of passive buildings most. Outside air temperature is rather irrelevant because of the good heat insulation of these buildings.
Weather stations measure only global radiation. Thus, UBIMET had to find a method for the separation of global radiation into direct and diffuse radiation. So far, the accuracy of the weather forecasts has been calculated for the weather station Donaufeld. The confidence intervals for all ten test regions are going to be calculated as next step.
The analysis of building standards and market potential in Austria by the project partner ee-consult showed that the data of public databases and studies only allow general statements. The data of benchmarking results (consumption per building category) are available mainly from Germany. The results from Germany are used by the Austrian Energy Agency and klima:aktiv program in Austria, too. Thus, the results can be used as benchmarking base for Austria and exploited for ProKlim.
Next Steps
In the further process of the project measured and predicted values of direct radiation for all ten test regions will be provided for 36 months. These data are the basis for the thermodynamic simulation. With the resulting energy key figures and the building standards in Austria the energy savings potential for Austria can be evaluated. In addition, technical information of telematic systems in existing buildings and often used data protocols will be collected and scenarios for the data transfer and implementation of weather forecasts into the building control will be developed.
(Expected) results
The concrete result of the project will be the potential energy savings using weather forecasts as variable for controlling heating and cooling in buildings in form of saved energy, costs and CO2-equivalent. Transfered to existing buildings in Austria the energy savings potential can be extrapolated from the test building to Austria. By simulating different scenarios (different location, different forecast quality, different weather situations) single variables in the building, regarding the weather and the internal use, which influence the indoor temperature shall be detected. At the end of the project it should be possible to give recommandations for the integration of weather forecasts into the telematic control components (hardware), and how a building has to be equiped to use weather forecasts as control variable for the air conditioning.
Project partners
Project management
UBIMET GmbH
Project or cooperation partner
- Austrian Institute of Technology AIT
- ee-consult, Inh. Ing. Emanuel Gstach, Energieeffizienz und erneuerbare Energien, Ingenieurbüro Energie-Consulting
Contact address
UBIMET GmbH
Dipl.-Ing. Mario Kahn
Dresdner Straße 82
A-1200 Wien
Tel.: +43 (1) 9971004
Fax: +43 (1) 9971004-20
E-Mail: mkahn@ubimet.com
