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7 mars 2008 | Saint Gobain | PAGE 1
> Peter RIEDERER, CSTB
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Renewable energy group > Peter RIEDERER, CSTB 7 mars 2008 | - - PowerPoint PPT Presentation
Renewable energy group > Peter RIEDERER, CSTB 7 mars 2008 | - - PowerPoint PPT Presentation
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
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Technical evaluation Solar thermal
Test facilities for the evaluation of
thermal and mechanical performances
- f solar
thermal components and systems
Large demand on certification and
technical approvement
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Innovation Solar thermal
Solar panel - air Solar panel - thin Controller for solar combi-systems
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Innovation Geothermal
Optimisation Absorption heat pump GEOBAT (F) et MESSIB (EU)
Seasonal storage in the ground
COFOGE
Energy piles
Geothermal platform (R&D)
Borehole field Multi-site approach (BRGM)
Semi-virtual platform PEPSY
Evaluation methodology geothermal heat pumps
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Innovation Photovoltaics
Single, double
- r triple glazing
Assessment of:
- Temperatures
- Weather data
- Electricity production
I ntegration in buildings and facades
Impact of cooling of PV modules
Better efficiency Use of thermal energy
I ntegration in systems - hybrid
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Assist public authorities Solar Thermal
1 2 4 7 12
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 1999 2000 2001 2002 2003 2004 2005 2006 temps milliers de tonnes de CO2
1 6 17 37 70 123
20 40 60 80 100 120 1999 2000 2001 2002 2003 2004 2005 2006 temps GWh énergie primaire
Avoided CO2 emissions using solar DHW systems in the frame of the Plan Soleil
Avoided primary energy using solar DHW systems in the frame of the Plan Soleil
Performance evaluation of the PLAN SOLEI L - Monitoring
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Assist public authorities Geothermal
Roadmap for the development of GT heat pumps in France for the french energy agency - ADEME
Adaptation et nouveaux développements Aspects non-technologiques Démonstration et vérification des performances Diffusion, formation, évaluation et prospective Etat de l’art: Technologies disponibles à l’étranger Transfert des technologies vers la France Barrières non- technologiques Aspects socio- économiques R&D Nouveaux développements Plateformes d’essais Essais sur plateformes Démonstration Suivis des performances réelles Analyse Etat de l’art Définition des besoins Besoins et demande Incitations, subventions etc. Diffusion du savoir Formation Incitation du marché
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Assist public authorities Real performances of heat pumps
Website CSTB on heat pumps www.valpac.fr
Real pereformances of geothermal heat pumps Information on technologies Automatic generation of reports of monitored projects using dynamic databases Online comparison of all projects in the database (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)
Monitoring methodologies of heat pumps (SEPEMO)
Develop monitoring methodologies and guidelines for heat pumps Adaptat Valpac Website
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Dissemination
Software Guidelines Websites
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A Global approach for evaluating seasonal performances of heat pumps
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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
06/10/2009
Global concept
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switch between different simulation environments
06/10/2009
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Global concept
GT Platform Semi-virtual Platform PEPSY
Validation of borehole and BTES models for different configurations Testing GSHP systems by emulation Testing controllers by emulation Combination between product testing and modelling by using model identification Ability to freely vary the border between the simulated and real part of the system
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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
06/10/2009
Semi virtual platform PEPSY
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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.
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BTES Platform
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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 : 1700m3
(water equivalent : 800m3)
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BTES Platform
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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
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BTES model
General description :
3D numerical model – Finite difference method – Implemented in Matlab / Simulink Governing equation : State space resolution : ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ∂ ∂ + ∂ ∂ + ∂ ∂ = ∂ ∂
2 2 2 2 2 2
z T y T x T t T Cp
s s s
λ ρ Main parameters: Number of boreholes Borehole spacing Several ground layers : thermal conductivity, heat capacity, density Hydraulic network
BU AX X + =
- Couleurs interpolées !
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BTES model
Mesh around the borehole field Mesh around
- ne
borehole Node coupled with pipe model
One borehole 2x3 borehole field
Header Volume Volume with GHEs Footer Volume Header Volume Volume with GHEs Footer Volume
Weather conditions Temperature profile
The ground model is coupled to ground heat exchangers models : heat transfers calculations between the fluid and the borehole wall are solved in steady state conditions use of thermal resistance
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Conclusion
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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
- perationnal, test sequences will be carried out soon