Vacuum Super-Insulated Heat Storage for High Solar Fraction

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1 Vacuum Super-Insulated Heat Storage for High Solar Fraction Dipl.-Phys. Manfred Reuss 1, Dipl.-Ing. (FH) Jürgen Melzer 2 1 Bavarian Center for Applied Energy Research Division: Walther-Meissner-Str. 6, D Garching reuss@muc.zae-bayern.de 2 HUMMELSBERGER Schlosserei GmbH Am Industriepark 5, D Muehldorf info@vakuum-pufferspeicher.de Freilassing

2 Objectives Development of a high efficient sensible heat storage for solar applications: Reduction of heat losses Increase energy density by increasing the operational temperature range e.g. 40/95 C to / C Improve the performance by stratification SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 2

3 Thermal Insulation Heat transport mechanisms: Conduction Convection Radiation T1 conduction convection radiation T2 > T1 Conventional insulation materials reduce this heat transport significantly material a rock / glass wool b polyurethane c polystyrene d foam glass thermal conductivity (20 C) W/(m*K) W/(m*K) W/(m*K) W/(m*K) SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 3

4 Effective thermal conductivity in W/(m*K) BAVARIAN CENTER FOR Conventional Insulation and Humidity Humidity in Vol.-% thermal conductivity up to 30 times higher, even above λ water, even for low humidity, extremely critical above 70 C - 90 C F. Ochs et al., J. heat mass tr., SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 4

5 Vacuum Insulation (VI) ( Thermos Flask ) double walled container evacuation of the annular space below 10-3 mbar no convection, no gas thermal conductivity 4 4 A T T Q only heat transport by radiation (dependent on emission ε of the walls and independent of the wall distance d) advantage with respect to conventional insulation only for small gaps SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 5

6 Heat flux q [W/m²] BAVARIAN CENTER FOR Comparison of Insulation Techniques conv. insulation, l = 0,03 W/mK VI, = 0,3 d 100 C 0 C VSI, l = 0,01 W/mK VI, = 0,1 VI, = 0, ,05 0,1 0,15 0,2 0,25 0,3 Wall distance d [m] SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 6

7 Comparison VSI vs. Conventional Insulation Source: VDI-Wärmeatlas, own measurements for VSI insulation 0,07 0,06 0,05 0,04 0,03 0,02 0,01 T = 20 C T = 50 C T = 80 C (aver. insulation temperature) 0 mineral Mineralwolle wool foam Schaumglas glass exp. exp. Perlit Perlit VSI with VSI exp. mit Perlit (dry) (trocken) (nicht (not evac.) evakuiert) exp. Perlit reduction of thermal conductivity by a factor of 5-7 avoid problems with humidity and aging SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 7

8 Heat Transport in VSI convection gas therm. conduction evacuation therm. radiation absorption + scattering solid state conductivity smallest contact area, deviation vacuum super insulation foam fibers foils powder SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 8

9 Construction of a VSI Solar Storage air purging outer tank solar stratification unit solar supply inner tank vacuum flange heating/dhw supply annular gap with Perlit and Vacuum 0,05 mbar stratification unit heating heating/dhw return solar return SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 9

10 Measurement Result: Thermal Conductivity starting pressure 16,5 m³ prototype pressure after 20 a 16,5 m³ prototype After 20 years 1,4 mbar -> Perlit: λ = 0,020 W/mK, pyrogenous silica acid: 0,005 W/mK 3 times better than dry mineral wool, re-evacuation easy possible SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 10

11 Heat Losses Measurements dt K 0,23 dt d UA-value = 1,98 W/K, including pipes, connections and support of the inner tank λ of the insulation = 0,009 W/mK, potential to 0,007 W/mK SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 11

12 Temperature Stratification Two ways of heat supply to the storage: Indirect supply via heat exchanger (left) Direct heat supply by charging the fluid layer wise (right) indirect system direct system SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 12

13 Temperature Stratification Stratification: 1. Development of a temperature stratification during charging 2. Supply the fluid in a stratified storage to the layer of the same temperature without destroying of the stratification charging stratify SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 13

14 Temperature Stratification Temperature stratification has operational advantages Ideal case: discharge the total heat content at a high temperature level Operational advantages (higher efficiency) for heat supply by solar collectors, heat pumps or condensing boilers Increases the direct use of solar heat Important feature for VSI storage because of low losses SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 14

15 Test of Various Stratification Units SB 1 SB 4 SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 15

16 SB1 Experimental Results ideal behavior ideal behavior OK poor mixing of the upper 2/3 SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 16

17 SB4 Experimental Results ideal behavior ideal behavior OK almost perfect SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 17

18 Pilot Storages Produced According to AD2000 SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 18

19 Solar Space Heating Application SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 19

20 Solar Space Heating Application SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 20

21 Applications of VSI-Technology seasonal storage industrial process heat solar power plants up to 100 C C C Bildquelle: Wikipedia SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 21

22 Conclusions VSI storage is applicable for sensible latent thermo-chemical storage VSI storage allows long-term storage with low heat losses solar space heating and DHW with high solar fraction It is especially interesting for higher storage temperatures and interesting for industrial applications process heat e.g. food industry waste heat and heat recovery district heating SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 22

23 Thank you very mauch for your attention The project was funded by the Federal Ministry for Environment, Nature Conservation and Nuclear Safety FKZ : A the authors appreciate this support very much SMEThermal 2013 Bavarian Center for Applied Energy Research Berlin 23

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