Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

 
 
Session Overview
Session
ENER
Time:
Tuesday, 05/July/2022:
3:30pm - 5:00pm

Session Chair: Giuliana IANNACCONE
Location: Hall A


Energy efficency and energy systems for buildings

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Presentations
3:30pm - 3:45pm

Use of Energy Profile Indicators to Determine the Expected Range of Heating Energy Consumption

Tobias LOGA, Britta STEIN, Guillaume BEHEM

IWU - Institut Wohnen und Umwelt GmbH (Institute for Housing and Environment), Germany

A small set of query variables designed to collect information about the energy-related features of residential buildings is presented. These “energy profile indicators” include information about those visible characteristics of a building which have a notable impact on its energy performance and are simple to assess. The queries are an interesting source for a rough energy performance calculation for single buildings as well as for housing portfolios or housing stocks.

A method has been developed to transform the energy profile indicators into input data for a physical calculation model. It consists of procedures to estimate the envelope area, U-values, and efficiency values of the heat supply system. To all model input variables an uncertainty is assigned. If information from a query is not available, the model input is set to a state representing the average building stock and the uncertainty of this quantity is adjusted to a value reflecting the variance in the stock. The resulting uncertainty of the calculated energy use is determined.

Examples of the application of the method are given to show the influence of different unknown quantities including occupant behaviour. Experiences on the coherence with metered consumption are reported.



3:45pm - 4:00pm

Evaluation of Thermal and Mechanical Properties of Demonstration Wall utilizing Phase Change Cementitious Materials

Jan CERVENKA1, Michaela HERZFELDT1, Antonio CAGGIANO2, Eduardus KOENDERS2

1Cervenka Consulting s.r.o., Czech Republic; 2Technische Universität Darmstadt, Institut für Werkstoffe im Bauwesen, Germany

International project PoroPCM involves partners from Germany, Czech Republic, Spain and Japan with the objective to develop new multifunctional Phase Change Materials modified porous cementitious nanocomposite (PoroPCM) that can be used for storing large amounts of heat energy in the insulation layer of buildings. For the testing of the newly developed phase change cementitious composite a demonstration wall has been developed and tested for its thermal as well as mechanical performance. The topic of the paper is the brief description of the properties of the new phase change cementitious nanocomposite. The main emphasis of the paper is the description of the demonstration wall design. The wall design is supported by numerical simulation of the wall physical parameters.

The numerical modelling involves the definition of suitable numerical models for the simulation

of the thermal properties of the new phase change nanocomposite and its calibration on laboratory tests. The numerical model is then used for the parametric study of optimal wall layer design and thicknesses of the individual wall layers.

The developed wall design will be tested and verified by a large scale test in the final year

of the project.



4:00pm - 4:15pm

Calibration of a Summer Building Simulation Model Based on Monitoring of User Behaviour

Dóra SZAGRI, Ainur KAIRLAPOVA, Balázs NAGY, Zsuzsa SZALAY

Budapest University of Technology and Economics, Hungary

Occupant behaviour is a field, that has always been of great interest to researchers. It could significantly modify the operation of the building and the user's energy needs, and it is also difficult to model it according to reality. Evaluation of measurements is a crucial step to calibrate dynamic simulations. Our goal was to analyse the indoor comfort conditions according to measurements, particularly in summertime, and find what solution closes the performance gap between the measured and simulated results. In this research, we investigated an apartment building that underwent an energy efficiency renovation. We have installed a weather station and monitoring sensors in selected apartments, with which we monitored the temperature, relative humidity, and CO2 values of certain rooms, the presence of the inhabitants and the window opening and the operation of shading. In this paper, we focus on the monitoring and simulation results of the topmost apartment. The results can help us better understand how buildings work and how to implement user behaviour in dynamic simulations, how to calibrate the model according to measurements and make suggestions to increase the comfort of the residents.



4:15pm - 4:30pm

Verification of Window Properties after 10 Years Exploitation: Results of Measurements in the Pavilion Laboratory and in the Climate Chamber

Marek BARTKO, Pavol ĎURICA

University of Zilina, Faculty of Civil Engineering, Department of Building Engineering and Urban Planning, Univerzitna 8215/1, 010 26 Zilina, Slovak Republic

The article will deal with the analysis of measured data on a plastic window with thermal insulating triple glazing, which is suitable for low-energy or passive houses. The window was installed in 2011 in the test laboratory of the Department of Building Engineering and Urban planning, Faculty of Civil Engineering, University of Zilina (Slovakia), where it was tested under standard indoor climate conditions and real outdoor climate conditions. Surface temperatures on the frame friezes and glass system and heat flux density were recorded at a five-minute time step. In 2020, the window was removed from the laboratory and subsequently tested in a climate chamber. This paper will present the results of these measurements in terms of heat flow density waveforms, heat transfer coefficient and total solar transmittance through the glazing. Subsequently, a simulation model of this window will be created in the environment of a computational program and its verification based on the measurements will be carried out. A series of calculations will be performed on the tuned model and analyses of the results and comparisons will be presented under the same climatic conditions as during the real measurements recorded by the meteorological station.



4:30pm - 4:45pm

Increasing Thermal Protection with Use of Green Roof

Peter JURAS

University of Zilina, Slovak Republic

The use of green roof is a great choice in case of climate change mitigation and reduction of urban heat islands. Positive aspects of green roofs during winter or the whole year round balance are often overlooked. The surface of highly insulated flat roof is overcooled during the night by the long wave sky radiation. This radiative cooling increases the thermal losses that are reduced by the existence of additional layers. The green roof composition layers also have their thermal resistance, which is not usually included within the calculation of thermal resistance using the EN ISO 6946. The presence of snow on the roof can also increase the resistance. This paper analyzes the measurement results of various experimental green roof fragments in Central Europe.



4:45pm - 4:52pm

Durability of Latent Heat Storage Systems

Sylva BANTOVÁ, Milan OSTRÝ, Karel STRUHALA

Vysoké učení technické v Brně, Fakulta stavební, Czech Republic

Energy flexibility of buildings strongly depends on the thermal energy storage capacity of building structures and storage units integrated in building services. Latent heat storage represents technology with significantly higher energy storage density. Paper will contain results from laboratory experiments focused on the compatibility of heat storage media with materials of container and comparison of environmental impact of different phase change materials as latent heat storage media for proposed integration in building structures. Three organic-based and one inorganic-based phase change materials were selected for tests of compatibility with selected metals (aluminium, copper and brass) and plastics (PE-HD and PP-R).



 
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