Compact Thermal Energy Storage


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  • Compact Thermal Energy Storage

    1. 1. Compact Thermal Energy Storage Wim van Helden Webinar Leonardo-Energy 23 Jan. 2009
    2. 2. Contents of this Webinar <ul><li>Share and potential of Thermal Energy Storage </li></ul><ul><li>Introduction to Compact TES </li></ul><ul><li>TES technologies: principles and applications </li></ul><ul><ul><li>Phase Change Materials </li></ul></ul><ul><ul><li>Sorption Thermal Storage </li></ul></ul><ul><ul><li>Thermochemical Materials </li></ul></ul><ul><li>International developments </li></ul>
    4. 4. Position of Thermal Energy Storage <ul><li>Thermal storage: enabling technology </li></ul><ul><ul><li>solar thermal </li></ul></ul><ul><ul><li>concentrated solar power </li></ul></ul><ul><ul><li>biomass </li></ul></ul><ul><ul><li>cogeneration </li></ul></ul><ul><ul><li>heat pumps </li></ul></ul><ul><ul><li>district heating </li></ul></ul><ul><ul><li>… </li></ul></ul>
    5. 5. <ul><li>enables a larger share of renewables </li></ul><ul><li>system optimisation - diminish the number of on/off cycles - satify peak demand (enabling smaller heat generators) </li></ul><ul><li>demand-side management - operation determined by energy prices - optimally controlling (micro) cogeneration </li></ul>Relevance of Thermal Energy Storage For all energy sources buffering of heat is desirable . For the application of solar thermal energy and ambient heat buffering is even necessary .
    6. 6. Stage of development of TES technologies TCM (chemical) Research Sorption (latent) Development PCM (latent) Demonstration Water (sensible) Mature market
    7. 7. <ul><li>Sensible heat - principle: heat capacity - reservoirs, aquifers, ground/soil </li></ul><ul><li>Latent heat - principle: phase change (melting, evaporation, crystallisation) - water, organic and inorganic PCMs </li></ul><ul><li>Sorption heat and Chemical heat - principle: physical (adhesion) or chemical bond (reaction enthalpy) - a d sorption and a b sorption and chemical reactions </li></ul>Principles for Thermal Energy Storage
    8. 8. Classification of Thermal Energy Storage
    9. 9. Characteristics of TES <ul><li>Values Unit </li></ul><ul><li>temperature level [ºC] </li></ul><ul><li>specific energy density [kJ/kg] or [MJ/m 3 ] </li></ul><ul><li>thermal power [kW] </li></ul><ul><li>Categories Choice between </li></ul><ul><li>- time to market research/test,demo/available for market </li></ul><ul><li>storage period day / week, month / season </li></ul><ul><li>Building integration possible / not possible </li></ul>
    10. 10. COMPACT HEAT STORAGE <ul><li>When available storage volume is limited  compact heat storage </li></ul><ul><ul><li>Volume of a seasonal storage for a single family house (m 3 ) </li></ul></ul>kWh/m 3 140-830 70 31 MJ/m 3 500-3000 250 110 Storage density Chemical Latent Sensible
    11. 11. Phase Change Materials <ul><li>Principle: heat used to melt or evaporate material </li></ul><ul><li>Typical storage densities </li></ul><ul><ul><li>334 kJ/liter (ice-water) </li></ul></ul><ul><ul><li>250 kJ/liter (parafines) </li></ul></ul><ul><li>Applications </li></ul><ul><ul><li>Cold storage </li></ul></ul><ul><ul><li>Overheat protection </li></ul></ul><ul><ul><li>Comfort temperature control </li></ul></ul><ul><ul><li>CSP: system optimisation </li></ul></ul>
    12. 12. PCM Energy stored as function of temperature
    13. 13. Latent heat storage in PCMs PCM interesting at small temperature difference (around melting temperature) Left: volume of water and of TH29 needed for storage of 1 MJ heat. Right: mass of water and of TH29 needed for storage of 1 MJ heat. Volume water and TH29 for 1 MJ storage 0 5 10 15 20 25 0 - 100 10 - 60 15 - 40 20 - 30 temperature difference (°C) litres water TH29 Mass of water and TH29 for 1 MJ storage 0 5 10 15 20 25 0 - 100 10 - 60 15 - 40 20 - 30 temperature difference (°C) kilograms water TH29
    14. 14. Water as Phase Change Material <ul><li>storage of heat in phase change from solid - liquid (334 kJ/kg) </li></ul><ul><li>cheap medium (also available encapsulated) </li></ul><ul><li>interesting in case of combined heating and cooling demand </li></ul><ul><li>water-ice mixture behaves like liquid up to 20-25 % ice </li></ul><ul><li>storage at 0ºC results in small losses to ambient </li></ul><ul><li>storage at 0ºC results in necessary upgrading heat (heat pump) </li></ul>
    15. 15. Latent heat storage in ice Storage tanks for water filled polyethene balls, 2 projects in United States
    16. 16. <ul><li>for instance paraffines or polymers </li></ul><ul><li>heat conduction of material determines charging power, length of polymer chains determines melting temperature </li></ul><ul><li>relative to anorganic PCMs: larger melting heat and higher heat capacity </li></ul><ul><li>uniform melting behaviour, stable, non toxic, non corrosive </li></ul><ul><li>suited for impregnation of building materials </li></ul><ul><li>prevention of evaporation, odours and volume changes by encapsulation </li></ul><ul><li>available in different forms </li></ul>Organic PCMs
    17. 17. Organic PCMs Left to right: - powder: 60% paraffine and silica material - granulate: 35% paraffine and diatomee earth - boards: 65% paraffine and wood fibre board New development. Compound: 80% paraffine, for direct contact with water, for instance in reservoir
    18. 18. Latent heat storage: PCM for daily storage <ul><li>demonstration house in Perth, Australia </li></ul><ul><li>day storage of solar heat from 30 m 2 collectors </li></ul><ul><li>storage in 90 m 2 TH29-system (equivalent to 0,65 m 3 PCM) </li></ul><ul><li>TH29-system: capsules on long strips integrated in floor, melting temperature of PCM 29ºC </li></ul><ul><li>buffer is charged with flexible pipes between capsules </li></ul><ul><li>LT floor heating system </li></ul>
    19. 19. Phase change Materials in walls development project with the partners BASF, caparol, maxit and Sto with Fraunhofer ISE 1/1999 - 9/2004 funded by BMWi FKZ 0329840A-D
    20. 20. measurements two identical rooms measured without and with two PCM products monitored one year each result: - 4 K difference reached - night ventilation essential
    21. 21. Since 2004 several products: Different products with microcapsules: plaster, plasterbords, porous concrete… ….. Different macrocapsules: Dörken, Rubitherm, SGL, Climator and others BASF: micronal SmartBoard™ Other systems: Energain, Rubitherm granules Foto: BASF
    22. 22. Latent heat storage: inorganic PCMs PCM can of Climator: typically applied in transformer rooms and telecom installations Nodule of Cristopia: HDPE ball filled with eutectic salt
    23. 23. Storage for Concentrated Solar Power CSP <ul><li>KNO 3 – NaNO 3 mixture </li></ul><ul><li>Melting around 250 C </li></ul><ul><li>Spain, USA </li></ul>Two-tank direct molten-salt thermal energy storage system at the Solar Two power plant. (National Renewable Energy Laboratory)
    24. 24. Sorption heat storage <ul><li>Physi-sorption: molecular adhesion forces </li></ul><ul><li>Adsorption: Surface effect, porous media </li></ul><ul><li>Silicagel, zeolites </li></ul><ul><li>Mixing effect: absorption </li></ul><ul><li>NH 3 , LiCl, LiBr </li></ul><ul><li>Similar to sorption heat pumps </li></ul>
    25. 25. Zeolites <ul><li>Microporous structure </li></ul><ul><li>Composed of AlO 2 and SiO 2 with metal atoms </li></ul><ul><li>Adsorption of vapours and gases </li></ul><ul><li>Selective adsorption dependent on molecule size </li></ul><ul><li>Stronger bond: higher desorption temperature </li></ul>Crystal structures of three basic zeolite types: ITA, CHA and MFI
    26. 26. Temperature dependance <ul><li>Differential mass loss for ALPO-18, ALPO-5, LiNaX (zeolite) and SAPO-34 as function of temperature (Jänchen, 2005) </li></ul>
    27. 27. Zeolite <ul><li>Zeolite 13X beads and pellets </li></ul><ul><li>Small zeolite particles are bound with clay-like binding materials </li></ul>
    28. 28. Heat Storage with Zeolite <ul><li>Monosorp system (ITW Stuttgart, DE) </li></ul><ul><li>Zeolite channeled bricks </li></ul><ul><li>Solar thermally loaded heat exchanger </li></ul>
    29. 29. Sorption heat storage: diurnal storage <ul><li>Field experiment in school in Munich, Germany </li></ul><ul><li>Diurnal storage of heat from district heating </li></ul><ul><li>Storage in 7000 kg Zeolite 13X (volume 10 m 3 ) </li></ul><ul><li>Charging at night (at 130ºC) by separating water vapour from zeolite </li></ul><ul><li>Discharge at day by absorption of water vapour in zeolite </li></ul><ul><li>Air heating (for base load) and LT radiators and floorheating </li></ul><ul><li>Peak power at discharging 120 kW </li></ul>
    30. 30. Chemical heat storage General principle A + B  AB + heat <ul><li>Components stored sepearately without heat loss </li></ul><ul><li>Long term heat storage </li></ul><ul><li>Charge with temperatures typically higher than 100ºC </li></ul><ul><li>Storage capacity between 250 and 4000 kJ/kg </li></ul>
    31. 31. Materials selection (ECN, 2004) <ul><li>Principal criteria: energy storage density, temperature </li></ul>
    32. 32. Thermochemical material – MgSO 4 x7H 2 O <ul><li>Reaction: MgSO 4 xnH 2 O + heat  MgSO 4 + nH 2 O </li></ul>Sample mass decreases at increasing temperature
    33. 33. The scale of chemi-sorption <ul><li>Grain of MgSO 4 </li></ul>
    34. 34. Magnesiumsulphate (ECN –NL) <ul><li>Separate reactor concept </li></ul>
    35. 35. Sodiumhydroxide Storage (EMPA – CH) <ul><li>2NaOH    Na 2 O + H 2 O </li></ul>
    36. 36. Chemical heat storage at higher temperatures <ul><li>Chemical reactions </li></ul><ul><li>e.g. 1/2 N 2 + 3/2 H 2  NH 3 + heat (Nat. University of Canberra, Australia) </li></ul><ul><li>presently 1 kW prototype: dissociation (charging) at 400 - 500ºC and discharge in a reactor that drives a steam cycle </li></ul><ul><li>plans to scale up to a 15 kW system </li></ul>
    37. 37. TCM Research and Development <ul><li>Goal: a compact heat storage system with storage density 8 times better than water. </li></ul><ul><li>Activities: </li></ul><ul><ul><li>materials research </li></ul></ul><ul><ul><li>process development </li></ul></ul><ul><ul><li>system development </li></ul></ul><ul><li>Typical system requirements for application of TCM heat storage in the built environment: </li></ul><ul><ul><li>storage density > 1 GJ/m 3 </li></ul></ul><ul><ul><li>driving temperatures < 180 °C </li></ul></ul><ul><ul><li>charge/discharge power 1-10 kW </li></ul></ul><ul><ul><li>storage capacity 100 kWh (micro-cogeneration) – 20 GJ (seasonal storage) </li></ul></ul><ul><ul><li># cycles: 30 (seasonal storage) – 1500 (micro-cogeneration) </li></ul></ul>
    38. 38. International developments <ul><li>IEA SHC Task 32: Advanced storage systems for solar and low energy houses ( </li></ul><ul><li>PREHEAT project: raising the political awareness of the importance of Thermal Energy Storage. ( </li></ul><ul><li>ESTTP Strategic Research Agenda SRA ( </li></ul><ul><li>National R&D programs for TES (FR, GE, …) </li></ul><ul><li>New IEA SHC/ECES joint Task 42/24: Compact Thermal Energy Storage: Materials Development for System Integration ( </li></ul>
    39. 39. Materials and Applications <ul><li>Two International Energy Agency (IEA) programs: </li></ul>Energy Conservation through Energy Storage Solar Heating and Cooling
    40. 40. Task 42/24: Compact Thermal Energy Storage: Material Development for System Integration <ul><li>Joint Task between Solar Heating and Cooling (SHC) and Energy Conservation through Energy Storage (ECES) </li></ul><ul><li>Operating Agents: </li></ul><ul><ul><li>SHC: Wim van Helden, ECN (NL) </li></ul></ul><ul><ul><li>ECES: Andreas Hauer, ZAE Bayern (DE) </li></ul></ul><ul><li>January 2009 – December 2012 </li></ul><ul><li>Kick-off meeting: 11-13 February 2009. Bad Tolz, DE </li></ul><ul><li>Main added value: Bring together experts from applications and material science </li></ul>
    41. 41. Objectives <ul><li>Identify, design and develop new materials and composites </li></ul><ul><li>Develop measuring and testing procedures </li></ul><ul><li>Improve performance, stability, and cost-effectiveness </li></ul><ul><li>Develop multi-scale numerical models </li></ul><ul><li>Develop and demonstrate novel storage systems </li></ul><ul><li>Assess the impact of new materials on systems performance </li></ul><ul><li>Disseminate the acquired knowledge and experience </li></ul><ul><li>Create an active and effective research network </li></ul>
    42. 42. IEA Task/Annex 42/24 Matrix approach
    43. 43. The building blocks for Compact Thermal Energy Storage <ul><li>Political awareness </li></ul><ul><li>International programmed approach </li></ul><ul><li>Active national participation </li></ul><ul><li>Active industrial participation </li></ul><ul><li>Clever ideas from.. </li></ul><ul><li>..Bright enthusiastic people </li></ul>
    44. 44. References <ul><li>IEA 32: </li></ul><ul><li>Ecostock conference: </li></ul><ul><li>Preheat project: </li></ul><ul><li>IEA ECES Annex 19, see </li></ul><ul><li>T4224: </li></ul><ul><li> </li></ul>