Renewable energy group > Peter RIEDERER, CSTB 7 mars 2008 | Saint Gobain | PAGE 1
REN at CSTB 4 missions: � Technical evaluation of REN products and components � R&D for industrial developments � Assist public authorities � Dissemination 7 mars 2008 | Saint Gobain | PAGE 2
Technical evaluation Solar thermal � Test facilities for the evaluation of thermal and mechanical performances of solar thermal components and systems � Large demand on certification and technical approvement 7 mars 2008 | Saint Gobain | PAGE 3
Innovation Solar thermal Controller for solar combi-systems Solar panel - air Solar panel - thin 7 mars 2008 | Saint Gobain | PAGE 4
Innovation Geothermal Geothermal platform (R&D) GEOBAT (F) et MESSIB (EU) Borehole field Seasonal storage in the ground Multi-site approach (BRGM) Optimisation Absorption heat pump Semi-virtual platform PEPSY COFOGE Evaluation methodology geothermal heat pumps Energy piles 7 mars 2008 | Saint Gobain | PAGE 5
Innovation Photovoltaics I ntegration in I ntegration in buildings and facades systems - hybrid Single, double or triple glazing Impact of cooling of PV Assessment of: modules •Temperatures � Better efficiency •Weather data •Electricity production � Use of thermal energy 7 mars 2008 | Saint Gobain | PAGE 6
Assist public authorities Solar Thermal Performance evaluation of the PLAN SOLEI L - Monitoring Avoided primary energy using solar 14.0 12 DHW systems in the frame of the Plan 12.0 milliers de tonnes de CO2 Soleil 10.0 8.0 7 123 120 6.0 GWh énergie primaire 4 100 4.0 2 80 70 2.0 1 0 0 0 60 0.0 1999 2000 2001 2002 2003 2004 2005 2006 37 40 temps 17 20 Avoided CO2 emissions using 6 1 0 0 0 solar DHW systems in the frame of 1999 2000 2001 2002 2003 2004 2005 2006 the Plan Soleil temps 7 mars 2008 | Saint Gobain | PAGE 7
Assist public authorities Geothermal Roadmap for the development of GT heat pumps in France for the french energy agency - ADEME Etat de l’art Adaptation et nouveaux Aspects Démonstration et Diffusion, formation, Incitations, subventions etc. Définition des besoins développements non-technologiques vérification des performances évaluation et prospective Etat de l’art: Transfert des Suivis des Technologies technologies vers performances Formation disponibles à la France réelles l’étranger Barrières non- R&D Besoins et technologiques Nouveaux Démonstration Analyse demande Aspects socio- développements économiques Incitation du marché Essais sur Diffusion du savoir plateformes Plateformes d’essais 7 mars 2008 | Saint Gobain | PAGE 8
Assist public authorities Real performances of heat pumps Website CSTB on heat pumps www.valpac.fr � Real pereformances of geothermal heat pumps Monitoring methodologies of heat � Information on technologies pumps (SEPEMO) � Automatic generation of reports of monitored � Develop monitoring methodologies and projects using dynamic databases guidelines for heat pumps � Online comparison of all projects in the database � Adaptat Valpac Website (performances, costs etc.) � Guidelines for future monitoring projects � To date only GT - all heat pumps in the future Monitoring projects Cité du Design (energy piles) Etap Hotel Blagnac (borehole fields) 7 mars 2008 | Saint Gobain | PAGE 9
Dissemination Websites Software Guidelines 7 mars 2008 | Saint Gobain | PAGE 10
A Global approach for evaluating seasonal performances of heat pumps 7 mars 2008 | Saint Gobain | PAGE 11
Global concept Objectives : � To develop a global approach for testing real performances of heat pump systems connected to BTES. � To optimise the global efficiency of these systems System components � Building (with its emitters), HP, BTES, controllers, eventually water storage, solar collectors, … How ? � Setting up a multi-application testing platform Expected Results/Tools : � Validated models for optimisation of BTES � Validated testing methods for the different parts of the systems and for the global system 12 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 12
Global concept Validation of borehole and GT Platform BTES models for different configurations Testing GSHP systems by emulation Semi-virtual Testing controllers Platform PEPSY by emulation Ability to freely vary the border between the simulated and real part of the system Combination between product testing and modelling by using switch between different model identification simulation environments 13 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 13
Semi virtual platform PEPSY PEPSY : Platform for the Evaluation of Performances of dynamic SYstems Principle : Emulation for any water flowed energy system in the power range up to 50 kW � A product can be tested under « quasi » realistic dynamic conditions � Simulation is slowed down to real time Real part : 4 different circuits can be utilised Simulated Part : Matlab/Simulink or TRNSYS 14 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 14
Testing method Approach : Mixture between annual simulation and a 12-day test in real time Objective : To assess annual performances of a system in a 12-day test, each day representing a « typical » day of one month Holdback : High inertia of the ground part of the system : state conditions in the ground have a significant influence on the heat pump performance � Need of a validated model Development of the methodology � Annual simulation of a geothermal heat pump for different climates, buidings, ground type, … � Development of a first test sequences by calculation of average days representing each the average of one month � adjustment of the average days in order to fit the extrapolated, annual consumption by the 12 day-test method with those calculated by annual simulation (optimisation of the test sequence) � validation of the method comparing the test results of the real heat pump with monitoring results of the same heat pump. 15 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 15
BTES Platform � 6 boreholes rectangular shaped storage : - 20m depth, equipped with double U-pipes - temperature sensors are integrated at the center of each double U-pipe at 3 different levels (1m, 10m and 20m depth) - boreholes backfilled with a 2W/(mK) conductivity blend � 5 additionnal boreholes - drilled to perform soil temperature measurements - boreholes backfilled with concrete � Estimated storage volume : 1700m 3 (water equivalent : 800m3) 16 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 16
BTES Platform A multi configuration experimental platform � It is possible to perform testing sequences for different BTES configurations : - modifying the hydraulic network - modifying control strategies of heat injection/extraction 17 7 mars 2008 | Saint Gobain | PAGE 17 06/10/2009
BTES model General description : 3D numerical model – Finite difference method – Implemented in Matlab / Simulink ⎛ ⎞ ∂ ∂ ∂ ∂ 2 2 2 T T T T ρ = λ ⎜ + + ⎟ Cp ⎜ ⎟ Governing equation : ∂ ∂ ∂ ∂ s s s 2 2 2 ⎝ ⎠ t x y z • State space resolution : = + X AX BU Main parameters: � Number of boreholes � Borehole spacing � Several ground layers : thermal conductivity, heat capacity, density � Hydraulic network Couleurs interpolées ! 18 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 18
BTES model 2x3 borehole One field borehole Weather conditions Mesh around one Temperature profile Header Header borehole Volume Volume Node Mesh coupled with around the pipe model borehole Volume Volume field with with GHEs GHEs The ground model is coupled to ground heat exchangers models : heat transfers calculations between the fluid and the Footer Footer Volume Volume borehole wall are solved in steady state conditions � use of thermal resistance 19 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 19
Conclusion Global approach � Evaluation of performances of GSHP systems Final objectives � To dispose of validated models for optimisation of BTES systems � To dispose of validated testing method for the different parts of the system as well as the global system Testing method validation � good agreement for directly obtaining geothermal heat pump annual performances in the case of a simulated heat pump BTES Platform � operationnal, test sequences will be carried out soon 20 7 mars 2008 | Saint Gobain | 06/10/2009 PAGE 20
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