European Researchers Night in Greece

The National Technical University of Athens (NTUA), the oldest and most prestigious educational institution of Greece in the field of technology presented HYBUILD during the #EuropeanResearchersNight 

NTUA’s presentation was focused on decentralized thermal systems for the production of electricity, heat, and/or cooling, from renewable energy sources and waste heat from various processes.

You can watch the video from the Researcher’s Night and NTUA’s Prof. Dr.-Ing. Sotirios Karellas’ presentation (less than 4 minutes), below:

HYBUILD at the Researchers’ Night 2020 in Lleida, Spain

On November 27th, HYBUILD was presented at the #EuropeanResearchersNight 2020 by our partner University of Lleida, GREiA Research Group.

The European Researchers’ Night, funded under the Marie Skłodowska-Curie actions (MSCA), is a Europe-wide public event that brings researchers closer to the public. The Night provides researchers the opportunity to showcase the diversity of science and its impact on citizens’ daily lives, and to stimulate interest in research careers – especially among young people. The events highlight how researchers contribute to our society by displaying their work in an interactive and engaging forum.

Within the events celebrated this year (under the EU funded project EuNightCat20 – GA 954506), specific HYBUILD content such as posters were developed for this participation, with the aim to make HYBUILD research and results accessible for a wide audience.

Examples are provided below, and further information can be found on the ‘Europe’s corner’ as well as on the ‘Our Research’ page of the event.

Continue reading “HYBUILD at the Researchers’ Night 2020 in Lleida, Spain”

Techno-Economic Analysis of a Heat Pump Cycle Including a Three-Media Refrigerant/Phase Change Material/Water Heat Exchanger in the Hot Superheated Section for Efficient Domestic Hot Water Generation

A new journal publication presenting HYBUILD outcomes has just been released !

Integration of a three-media refrigerant/phase change material (PCM)/water heat exchanger (RPW-HEX) in the hot superheated section of a heat pump (HP) system is a promising approach to save energy for domestic hot water (DHW) generation in multi-family houses. The RPW-HEX works as a desuperheater and as a latent thermal energy storage in the system. The latent thermal energy storage is charged during heating and cooling operation and discharged for DHW production. For this purpose, the water side of the RPW-HEX is connected to decentralized DHW storage devices. DHW consumption, building standards and climate, energy prices, material costs, and production costs are the constraints for the selection of the optimal storage size and RPW-HEX design. This contribution presents the techno-economic analysis of the RPW-HEX integrated into an R32 air source HP. With the aid of experimentally validated dynamic computer models, the optimal sizing of the RPW-HEX storage is discussed to maximize energy savings and to minimize the investment costs. The results are discussed in the context of a return of investment analysis, practical implementation aspects and energetic potential of the novel technology.

Profit after 20 years of operation for (a) Case #1 (passive house located in Helsinki) and (b) Case #2 (low energy building located in Strasbourg). Markers “▼”, “●” and “▲” denote small (140 L), medium (210 L) and large (280 L) decentralized DHW storage devices. Please note that for some cases, no profit can be made after 20 years of operation, so they are not shown in the figures.

Read the full article

Energy assessment based on semi-dynamic modeling of a photovoltaic driven vapour compression chiller using phase change materials for cold energy storage

A new journal publication presenting HYBUILD outcomes has just been released: Solar cooling systems are a promising solution for reducing the electrical consumption of conventional building cooling systems. Among various alternatives, photovoltaic driven vapour compression chillers are currently the most mature and economically feasible solar cooling technology. This study focuses on the semi-dynamic modelling of a vapour compression chiller coupled with a novel refrigerant-phase change material (PCM)-water heat exchanger (RPW-HEX) which replaces the conventional chiller’s evaporator, allowing the efficient storage of the produced cooling energy. A custom-build lumped parameter model was developed in TRNSYS and was used to assess the performance of the proposed system on annual basis. Using as benchmark a conventional PV driven vapour compression chiller with electrical storage, the retrofitted hybrid storage system showed improved performance, limiting the cooling demand peaks and enhancing the solar fraction, especially for partial cooling loads. Last, a comparison of the PCM thermal energy storage to conventional batteries was carried out, leading to enhanced performance characteristics for the latter.

Read more here