Innovative compact hybrid storage systems for low energy buildings
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A new report led by our partner AIT – the Austrian Institute of Technology – is now available on the Deliverables page of the website.
The HYBUILD public report “Full hybrid storage integrated” describes the integration phase of the hybrid storages for the Mediterranean and the Continental concept in the laboratories. Special focus was put on the hydraulic and electric integration of the main components. With this report, the knowledge about the integration of the specific components of the HYBUILD concepts is passed to the demo sites inside the HYBUILD project, where the technologies will be installed. Furthermore, it may help researchers and developers working on future experiments with the same or similar components. Therefore, potential problems in the system integration can be identified in advance.
A new HYBUILD report led by our partner AIT – Austrian Institute of Technology – has just been released. It presents research outcomes from HYBUILD related to the Distributed Control System (DCS).
Executive Summary of the report
This report provides a comprehensive description of the hard- and software communication interfaces between all actors, sensors, built-in controllers of the components and modules of the hybrid thermal and electrical sub-systems, and the existing automation systems used in the laboratory infrastructure at ITAE, NTUA, CSEM and AIT. The report gives detailed information on their configuration, developed human machine interfaces and interfaces to software for advanced control and simulation.
Abstract of the presentation and conference paper : With the diffusion of electric heating and cooling devices, coupling the electric and thermal systems in the residential sector is becoming attractive and could help to increase photovoltaic penetration. The heating and cooling needs of buildings correspond to an important component of the total energy consumption of the residential sector. Thus, it is important to properly design the thermal and electric systems accounting of the interactions from the first phases of the design process. In the design phase, detailed models implemented in dynamic simulation tools can be used for the sizing process of system components, but they hardly can be adopted in optimization algorithms due to the computational time required for each simulation. This is particularly true for multi-objective optimization algorithms, where usually a wide number of simulations is required. In this work, TRNSYS was used to train a machine learning model that is used in a multi-objective optimization with the final goal of improving the design of the thermal system and optimizing the KPIs of a coupled photovoltaic plus battery system.
The full conference paper is now available in the event proceedings, accessible here (link for a direct download here).
A new HYBUILD public report led by our partner CNR ITAE is now available on the Deliverables page of the website.
Executive summary of the report
This report describes the activity regarding the development of the sorption module, that is an essential part of HYBUILD Mediterranean solution, since it allows the operation of the compression with high efficiency by storage and conversion of solar energy.
Paraffins as phase change material in a compact plate-fin heat exchanger – Part I: Experimental analysis and modeling of complete phase transitions
Abstract: Thermal energy storages with phase change materials (PCM’s) based on plate-fin and tube-fin (gas-to-liquid) heat exchanger (HEX) designs show a comparatively high heat transfer performance and compactness. High heat transfer rates allow for optimal storage designs and operation close to the PCM’s phase change temperature. However, industrial-grade solid–liquid PCM’s and mixtures usually show a non-isothermal phase change behavior over an extended temperature range, sometimes with multi-step transitions, hysteresis and supercooling. These complex phenomena depend on the physical dimensions of the PCM in the HEX and the operating conditions. They need to be verified for each particular application and cannot be neglected. This contribution presents an experimental and model-based analysis of the phase transition behavior of three commercial paraffins filled in compact plate-fin HEX’s. The results indicate that non-isothermal phenomena critically affect the storage temperatures. Their impact on the thermal performance can be studied using relatively simple numerical models.
Paraffins as phase change material in a compact plate-fin heat exchanger – Part II: Validation of the “curve scale” hysteresis model for incomplete phase transitions
Abstract: Technical-grade and mixed solid–liquid phase change materials (PCM’s), such as commercial paraffins, can show a complex non-isothermal phase transition behavior, possibly with hysteresis and supercooling, two-step transitions and asymmetric phase transition peaks. Phenomenological modeling approaches can use data-driven methods to derive phase transition models represented by enthalpy–temperature or apparent heat capacity–temperature curves. These curves are then linked with simulation models for heat transfer in thermal storages with PCM’s. If the phase change is significantly affected by hysteresis, different curves might be tracked either for heating or for cooling. This “curve track” modeling approach is straightforward and easy to implement. However, it shows a poor performance considering conditions with interrupted phase change, which are relevant for the partial charging and discharging operation of thermal storages. This contribution presents a novel so-called “curve scale” model. Its superior performance is proved for three commercial paraffins and experiments with 31 interrupted phase change scenarios.
Quite a contrast when looking at the photovoltaics component of the HYBUILD hybrid storage system: under the snow in Langenwang, Austria, and shining in the sun in Aglantzia, Cyprus !
With its hybrid approach and its two versions, the HYBUILD solution aims to accommodate both Mediterranean climate where cooling is critical, and Continental climate where a stronger focus is put on heating demand.
Learn more about the HYBUILD technical system by watching this video, and follow the progress of the installations at the three demo sites (Austria, Spain, Cyprus) by monitoring their online photo albums on this page.
The workshop Renewable Heating and Cooling Solutions for Buildings and Industry at Sustainable Places 2020 brought together a selection of H2020 EU-funded projects involving experts from the biomass, geothermal, solar thermal, and heat pump sectors to discuss a common strategy for increasing the use of renewable energy technologies for heating and cooling for buildings and industry.
Our partner AIT – the Austrian Institute of Technology – contributed to a national workshop on Thursday, 26th of November 2020, at the ENOVA-conference.
The aim of the workshop was to identify and rank market barriers for “comfort climate boxes” (integrated heat pump solutions) with national stakeholders. This work is part of the IEA HPT Annex 55, where HYBUILD was already presented back in June this year.
The HYBUILD Continental System was presented as part of the contribution to this event.