Compact bio-based thermal energy storage for buildings

Project Information

ComBioTES

Grant agreement ID: 864496

DOI

10.3030/864496

Project closed

EC signature date 18 September 2019

Start date 1 November 2019

End date 31 October 2025

Funded under

• SOCIETAL CHALLENGES - Secure, clean and efficient energy

Total cost

€ 4 268 828,75

EU contribution

€ 3 999 128,75

Coordinated by

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
France

Periodic Reporting for period 2 - ComBioTES (Compact bio-based thermal energy storage for buildings)

Reporting period: 2022-11-01 to 2024-04-30

Summary of the context and overall objectives of the project

The global electric grid will more and more face growing stability and safety issues. The objectives of reduction of the emission of greenhouse gases lead to an ever more “electric society”. In parallel, the growing part of renewable energy sources in the global electricity mix is accompanied by specific issue related to the fluctuating characteristic of these sources and the temporal mismatch between their collection and their use.
At residential scale, thermal end-uses (space heating, hot tap water, cooling) represent a major part of electricity consumption in Europe and cause consumption peaks, often when electricity is expensive.
There is thus a real interest to develop appropriate thermal energy storage, suitable for buildings, to help managing the global electrical grid through load shifting and reduce the electricity bill of end-users.
ComBioTES will develop a modular compact thermal energy storage (TES) solution for heating, hot tap water and cooling fully adapted for electricity load shifting. This solution is based on two distinct thermal energy storage components. A first modular TES will be able to store hot tap water to be converted into ice storage during summer (cooling needs). A second compact latent TES, using high performances bio-based non-aggressive PCM, will store high heating energy amount, for space heating or hot tap water demands. The operation of the thermal storage will be optimized by the means of a dedicated Energy Management System taking information from the grid, the weather and load forecast, PV production if available etc.
Main objectives of the project concern the design, the manufacturing and the experimental characterization of the two thermal energy storage. The demonstration will be made in representative to real conditions/operations during an entire year of test.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

In the second reporting period, the following work was performed:

WP1:
RP2: The WP1 has been completed, with the definition of the boundaries conditions and some technical elements relatd to the PCM TES and the demosites, as well as the submission of the D1.5

WP2:
RP2: On the basis on the design defined during RP1, the engineering of both TES prototypes has been initiated. The engineering of the PCM TES tank is alsmot finished, as well as the definition of the list of additional components. The engineering of the versatile TES is completed, as well as its manufacturing and instrumentation. The manufacturing of the new test loop dedicated to the versatile TES is almost finished, with commissionin expected to start in June 2024.

WP3:
RP2: The experimental tests of T2.1 anb the investigation among the portfolio of Roquette did not lead to the definition of a relevant PCM for the ComBioTES thermal storage. Thus back up solution has been considered. The deliverable D2.3 has been submitted.

WP4:
RP2: The preliminary design of the low-level control algorithms for automating the TES process is almost completed, with final developments to be made when the final lists of components, modes, operations etc... of the PCM TES prototype will be finlaized. An important work of clarification and interfaces has been made between the needs of each demo-site,n the existing components and the selection of hardware/sorfware.

WP5:
RP2: The final thermal applications for the demonstration of the PCM TES have been precised. The complete PID, including the definition of additional elements and components, of the PCM TES are almost finished for the DTU and the CEA-INES demo-sites. Most of the interfaces have been adressed and treated. The modes of operations have been detailled also. Regarding the versatile TES, the work of integration into IEE-CAS demo-site is on-going. The legal and administrative works for the transfert of properties have been initiated.

WP6:
RP2: The initial design of the impact and risk analysis framework, including the financial parameters calculation model. In addition, they developed the initial model for Levelized Cost of Storage (LCOS) calculation has been developed. Uncertainty analysis using the Monte–Carlo simulation method and a sensitivity analysis to assess impact of different parameters on LCOS has been adressed. First results on LCOS and LCA are available.

In addition, the website was developed, the dissemination materials finalized, the results were published and the participation in relevant international events assured.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

The solution developed in ComBioTES integrates some beyond the state of the art innovations:
* the PMC storage integrates direct internal heating;
* the PCM storage integrates a multi-pass fluid flow;
* the concept of the versatile storage, i.e. hot storage during winter and cold storage during summer;
* the "high level EMS" at residential scale, i.e. the energy management system linked to the PCM storage and integrating/compiling information from the storage, weather forecast, electricity market etc.

To the end of the ComBioTES project, the following results are expected:
* Feedbak on the internal direct heating of PCM storage;
* Feedback on the multi-pass fluid flow of PCM thermal storage;
* Raw and analysed data of the PCM storage, from lab-scale to operation in real environment;
* Raw and analysed data of the switchable storage. Cross-analysis between two research centers;
* Feedback on the EMS and its related gains on the operation, the control and the economic aspects of the PCM TES.

The following potential impacts are expected:
* Participation to the electric grid load shifting;
* Increase of the integration of renewable energy sources in the global electric mix
* Economic gains for prosumers, i.e. household with integrated PV

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