1. Traceability, changes and challenges

2. EN 12976-2:2017 vs. 2006 The new revision is fully backward traceable
Traceability
The new revision is fully backward traceable
There’s no need to change former performed tests
Several new tests for solar only and solar + Supplementary systems are included
Some already existing test procedures had been adapted
Missing or modified tests could be repeated/ complemented to bridge the gap to current release
There’s the need for some general agreements and clarification on current release
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

3. EN 12976-2:2017 vs. 2006 Modified test procedures Freeze resistance
Drain back systems: New design requirements
Drain down systems: Obligation to measure the drain rate
Over temperature resistance
Only clarification for indoor and outdoor test procedure
Pressure resistance
Only clarification and clear pass/ fail criteria (pressure drops not more than 5%)
Water contamination
Better description of EN 1717 requirements
Mechanical load: See new procedures
Lightning protection
New reference to IEC :2010 and guide to check the requirements
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

4. EN 12976-2:2017 vs. 2006 Modified test procedures Safety equipment
Safety valve: Shall conform with EN 1489 (consider decision M21D18 about CE marking acc. to EN ISO )
General: New guide, how to perform the document evaluation
Labelling
It is recommended the consultation of checklists for evaluation of system documentation available as Solar Keymark Document SKN N0157R01
Thermal performance
Parasitic energy: New calculation method based on measured values and simulated working times
Solar + supplementary systems: For harmonization with ErP see new procedures
Reverse flow
New requirement: For systems without check valve the system shall be tested according to of ISO !
(Heat loss test with coupled and separated collectors)
Electrical Safety
New requirement: the laboratory shall verify the presence of CE marking.
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

5. EN 12976-2:2017 vs. 2006 Modified test procedures
Reference conditions for performance presentation
Auxiliary heater reference set temp.: 60°C to fulfil national or European specification such as e.g. TR16355
New implemented ErP requirements to be used for annual performance prediction. See also new procedures
Annex C (informative) Assessment of the ability of solar DHW systems to resist the extreme climatic conditions
Test procedure description simplified and shortened.
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

6. EN 12976-2:2017 vs. 2006 New test procedures Mechanical load
New test procedure for fully assembled thermosiphon systems or collector arrays
Currently only one method using sand sacks or stones (with vertical, not orthogonal load) is included!
Test performed with filled storage tank
New load classes 500/ 750 & 1000 Pa
Origin EN: :2017
Origin: EN :2017
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

7. EN 12976-2:2017 vs. 2006 New test procedures
Thermal performance of Solar + supplementary systems:
Harmonization with ErP
New calculation of the water heating efficiency of the auxiliary heater (based on DST-Test results; ErP related)
Contribution of the auxiliary heater (based on DST-Test results; ErP related)
Ability to cover the load: Additional new ErP based procedure (based on DST-Test results; ErP related)
Requirements for mixed water at 40 °C (based on DST-Test results; ErP related)
Annex B.5 Reference conditions for the performance of the auxiliary heater (based on DST-Test results; ErP related)
Annex G (normative) Reporting format in the framework of the EU regulations CDR 811, 812 and 814 dated 2013
Only a standard DST test for solar + supplementary is needed
All figures could be determined by simulation
Therefore, also the family definition is applicable
A workshop for SKN-Members might be useful (SCF project?)
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

8. EN 12976-2:2017 vs. 2006 Open Issues & room for improvement
safety equipment
Instead of special standards CE marking shall be required and checked
Reverse flow
The new required test procedure shall be limited to CSTG tested systems
For DST tested systems, reverse flow would be considered by increasing storage tank losses
This procedure is not possible for close coupled heat pipe systems (without a massive manipulation of storage tank)
Mechanical load
The test procedure shall be opened for additional ways to load the system (suction cap, cable pull & scale…)
It has to be verified, if a “Torque” due to wind load has to be applied?
The fully vertical load might be less critical with respect to wind load
Performance Prediction and ErP
Increase of ISO scope (faux limits)?
Adaptions based on detailed experiences after first use might be necessary
12/8/2018
23rd Solar Keymark Network Meeting – Larnaca, Cyprus

9. Thank you for your attention
Ulrich Fritzsche – Global Head of Technical Competence Center for Solar Thermal Products