Titel des Papers

1
NEGST WP4-8 Standards for Solar Fluids April
2005, Oslo   Michel Haller Institut für
Solartechnik SPFHochschule für Technik
HSROberseestrasse 10CH-8640 Rapperswilmichel.ha
ller_at_solarenergy.ch
2
Whats up?

• Results of the survey (2)
• What should be included in a new standard? -gt
  Decision! (3)
• Workplan / List of documents -gt Decision (3)
• Suitable testing methods for determination of
  anti-freeze lifetime (4) and/or fluid properties

3
Survey-Results

• Most needed is a new standard for testing
  lifetime and corrosion of solar fluids at
  elevated temperatures and pressures as
  encountered during stagnation of solar systems
• It has been argued that a list of fluid
  properties (freezing-point, heat capacitance,
  etc.) should be put together as a recommendation
  on what should be published by each manufacturer
  (testing methods for these properties are already
  available)
• The list of fluid properties should include data
  needed for LCA as recommended by WP4.9

4
Thanks / Participants
Siegbert Brand BASF DE M. Collares
Perreira INETI PT Signe Dahl Wedel DTU DK François
Derrien CSTB FR Ueli Frei SPF CH Markus
Hafner Clariant DE Frank Hillerns Tyforop DE Maria
Joao Carvalho INETI PT Alexander
Storch Arsenal AT K.-H. Tostmann STC-Aalen DE René
Werner EMPA CH
5
Focus areas / topics of standard(s)
Options

• A new testing method for lifetime / temperature
  limits of solar fluids (needs more work than
  scheduled inside NEGST)
• A list of fluid properties to be delivered by
  manufacturer (including data for LCA)
• Both (Options 1 2)
• in two separate standards
• in one standard

6
List of documents

• Survey on standards for solar fluids testing
  (done, September 2004)
• Report on survey of standards for solar fluids
  testing (done, December 2004)
• State of the art report on existing standards for
  the determination of fluid properties to be
  delivered by the manufacturer - including data
  for LCA (July 2005)
• State of the art report on existing standards for
  the determination of corrosion and fluid
  deterioration, standards and non standardized
  methods (July 2005)
• Recommendation for the use of standards for the
  determination of solar-fluid parameters (January
  2006)
• Recommendation for future work to be done for the
  elaboration of missing testing procedures (Fluid
  lifetime / deterioration, January 2006)

7
Existing standards
Parameter Existing Standards Freezing
Point ASTM D1177, D6660, (D3321), NF T78-102, BS
5117 Setting Point DIN 51583, DIN ISO
3016 Boiling Point ASTM D1120, BS 5117-1.2
Viscosity ASTM, D1545, D7042, DIN 51562, 1342-2,
53015, 53019, BS 188, EN ISO 3104 Density ASTM
D4052, D1122, D1122a, D5931, D1217, DIN 51757,
DIN EN ISO 15212-2, 3675 Thermal conductivity /
diffusivity ASTM E1952, ASTM D2717 Corrosion ASTM
D1384, E745, E712 pH ASTM D1287, DIN 51369, NF
T78-103 Reserve alkalinity ASTM D1121 Index of
refraction DIN 51423, 51757 Lifetime /
Temperature limits ? Heat capacitance ? Toxicity
/ Environmental Impact
8
Reportet Tests for Fluid Deterioration
9
ASTM Corrosion Tests

• ASTM D1384
• open beaker, T(max) 90 C
• ASTM E745
• simulation of solar system, including pump etc.
  in a small scale
• heated test cell atmospheric and/or inside
  autoclave

10
Simulation of a solar system
ASTM E745
11
Simulation of a solar system
SPF 2005
12
Influencing paramters

• Temperature profile / cycles and time
• Pressurized or open to atmosphere
• Ratio of evaporated fluid volume to total fluid
  volume
• presence of metals and trace ions (materials used
  in the construction)
• presence of oxygen

13
Fluid parameters

• Freezing point
• Corrosion
• Viscosity
• Particle formation
• pH
• Reserve Alkalinity
• Boiling point
• Index of refraction
• Metal ions in solution
• ...

14
Conclusions
A lot of work is needed to set up / validate a
new testing procedure Not enough ressources
inside the NEGST WP4-8 to do this work Thank you
for your attention / participation