WP 5: standards

1
WP 5 standards

• Objektives
• Make the standard (EN 12975) accepted everywhere
  without additional national requirements
• Make Key-marking of Solar tanks possible in
  order to ease also transnational trade of solar
  tanks

2
Task 1 General acceptance of Standards

• New work item on revision of EN 12975 accepted by
  TC 312 involving
• Quality testing of ETC
• Annual energy output calculation procedure
• Requirements and test methods for collector
  components
• Improved exposure test
• Minor items for reversion

3
Quality testing of ETC

• NEGST W4.1 Resource document
• Recommendations for revision of present methods
  (EN 12975)
• Thermal performance testing Efficiency testing
  and thermal capacity
• Problems with dry out effect during high
  irradiance conditions
• The present collector model is not able to
  accurately model the thermal capacitance and time
  constant
• The method available for calculating the thermal
  capacity (6.1.6.2) of the collector has been
  reported to underestimate the figures for ETCs

4
Quality testing of ETC

• NEGST W4.1 Resource document
• Recommendations for revision of present methods
  (EN 12975)
• Thermal performance testing
• Efficiency testing
• Thermal capacity
• Stagnation temperature measurement
• Specification of physical properties
• Quality testing
• Test cycle efficiency stagnation efficiency
• High temperature resistance- and exposure test
• Mechanical load
• Impact resistance

5
Quality testing of ETC

• NEGST W4.1 Resource document
• Proposal for new test methods
• Durability
• Reflector materials
• Freeze testing of heatpipe
• Glass to metal seal
• Recommendations for further work
• Heat transfer mechanisms and how different parts
  of ETCs respond to different kind of stress
• Weaknesses in today's performance test
• Vacuum losses

6
Annually energy output calculation procedure

• Desirable features of a common method for
• collector energy output
• Should be a part of standard (EN 12975) as an
  informative annex when ready
• Easy to perform but enough sophisticated to take
  account specific features of most common
  collectors in the market.
• Based on weather data from 3-4 reference
  locations in Europe
• Relating to the standard for EPBD calculations
  prEN15316-4-3
• Relating to the procedure for m2 to kWh
  conversion and IEA world statistics

7
Annually energy output calculation procedure

• Inquiry results for a common procedure
• Hour by hour calculation with constant collector
  mean temperature and different climates.
• 4 climates and locations (Wurzburg, Athens, Davos
  and Stockholm), Meteonorm data. 3 inlet
  temperature (25, 50 and 75ºC). 50ºC is the
  reference temperature.
• To be implemented in Microsoft Excel
• Possible to include other inlets temperatures,
  climates and locations
• SP provide some sample calculations before we
  decide to finalize the procedure

8
Annual energy output Excel version

• Starting input data
• Choose location
• Latitude, Longitude and STD Longitude are picked
  from a hidden sheet
• Meteonorm data are also in this hidden sheet

9
Annual energy output Excel version

• Collector data input

10
Annually energy output calculation procedure

• Results diagram and table
• kWh/(m2.month) kWh/(m2.year)

11
Requirements and test methods for collector
components

• Status January 2007
• Accepted as a part of upcoming revision of EN
  12975. This was done at the CEN TC meeting in
  Canary Island in April 2006. The work within CEN
  will be activated as soon as financing for
  implementations work on the M/369 is available
• Two documents regarding collector components are
  delivered as input to the upcoming revision
• Recommended qualification test procedure for
  solar absorbers durability (Carlsson, 2004)
• Polymeric materials in solar collectors Test
  methods and technical requirements (Spilg, 2004)

12
Requirements and test methods for collector
components

• Status January 2007
• Improved exposure / accelerated ageing test of
  collectors
• Suggested from NEGST that the Australian method
  should be taken as a starting point for the
  development of a new exposure test sequence in EN
  12975. The method is circulated in NEGST
• Polymeric materials in solar collectors
• New IEA-task is in definition phase

13
Minor items for reversion of EN 12975

• Application of the standards to
  tracking/concentrating collectors input ready
  to TC312
• Differented mechanical load test depending on
  collector type - incorporated to ETC suggestion
• Installer recommendations with regard to high
  performing collectors - incorporated to ETC
  suggestion

14
Task 2 Establish the basis for Key marking of
solar tanks

• Inputs from JEN
• 5.2.1 Solar tanks (prEN12977-3) was brought to
  the final prEN stage in cooperation with TC 312
• The CEN inquiry will probably take place in
  autumn 2006 and the EN will be available in
  January 2007 if there is a positive result of the
  vote
• 5.2.2 Development of scheme rules for Key marking
  solar tanks
• Funding for revising standards to fulfil
  requirements in M324, Energy labelling of hot
  water tanks will most probably be available from
  December 2006. Anyway we can with rather little
  effort develop a rough draft of Solar tank
  scheme rules.

15
Task 2 Establish the basis for Key marking of
solar tanks or for custom built systems

• Inputs from JEN
• Study on available methods and costs for tests on
  corrosion protection remains to be done if SK
  scheme rules are to be developed.
• HD points out that the development of SK scheme
  rules for tanks will be relevant even if we go
  for CBS?
• JEN suggest that SKII-WP5 acts as internal
  hearing group giving comments through out the
  revision of the tanks standards due to the M324
  requirements
• JEN suggest to make a (rough) draft of Solar
  Keymark scheme rules for tanks this should be
  rather easy done with some cut and paste from
  the collector/system scheme rules

16
WP 5 standards

• Action planned/time schedule and proposed actions
• Quality testing of ETC
• With respect to ETCs draft of revision proposal
  of the EN 12975 based on NEGST report and new
  measurements
• First draft 2007-05-31
• Final draft 2007-08-31
• Draft of new method for energy output calculation
• First draft 2007-04-06
• Final draft 2007-08-31

17
WP 5 standards

• Action planned/time schedule and proposed actions
• Requirements and test methods for collector
  components.
• First draft 2007-04-30
• Final draft 2007-06-30
• Improved exposure test. Further discussions is
  needed to agree about an alternative test.
• Minor items for reversion
• First draft 2007-05-31
• Final draft 2007-08-31

18
WP 5 standards

• Action planned/time schedule and proposed actions
• Develop a rough draft of Solar tank scheme rules
• First draft 2007-04-30
• Final draft ??
• Custom built systems??