EuroSun2008-5

System Families

It is possible within the Solar Keymark scheme rules to test and certify thermal solar collectors as families. This reduces the effort for the testing by far.

A similar procedure for SDHW systems is now in the stage of development among testing institutes in Europe. The “Centre Scientifique et Technique du Batiment” (CSTB) in France

developed the “Solen software” for the calculation of the efficiency of solar thermal heating systems in buildings according to prEN 15316-4.3:2006 [3].

The software has now been used to extrapolate between two tested forced-circulation systems. The systems were tested at Fraunhofer ISE using the Dynamic System Testing (DST) procedure according to EN 12976-2. The basic differences between the two systems are the size of the collector array and the size of the storage tank

System A: 2 collectors, Aa=4,72 m2; Storage tank, 295 l

System B: 3 collectors Aa=7,08 m2; Storage tank, 380 l

The following table shows the deviation between test results and simulations done using the “Solen software”. The simulations are adjusted with the test result of the other system in the “system family”. It is seen that for the location Davos, for instance, the deviation between test result and the simulation is smaller than for Athens. Looking at this particular system family the deviation for the locations Stockholm and Davos are very small. More tests and simulations have to be done to validate the procedure.

Table 1. The table shows the deviation between test results and simulations for the reference locations in Europe: Davos, Wurzburg, Athens and Stockholm.

Location: Davos

Energy demand Solar Contribution [kWh/a] [kWh/a]

Solar Fraction [-]

Deviation

[%]

DST-test-simulation, System A

5049

3024

0.60

Simulation, Solen software

5038

3030

0.60

0.41

DST-test-simulation, System B

5053

3936

0.78

Simulation, Solen software Location: WQrzburg

5038

3913

0.78

-0.29

DST-test-simulation, System A

4217

2016

0.48

Simulation, Solen software

4451

2032

0.46

-4.49

DST-test-simulation, System B

4212

2489

0.59

Simulation, Solen software

4451

2729

0.61

3.74

Location: Athens

DST-test-simulation, System A

3475

2332

0.67

Simulation, Solen software

3459

2229

0.64

-3.96

DST-test-simulation, System B

3470

2700

0.78

Simulation, Solen software Location: Stockholm

3459

2762

0.80

2.63

DST-test-simulation, System A

4647

2008

0.43

Simulation, Solen software DST-test-simulation, System B

4638

2016

0.44

0.61

4654

2560

0.55

Simulation, Solen software

4638

2541

0.55

-0.39

EuroSun2008-5

Automatic Control System

The whole automation system is mainly divided into two parts: one part is the hardware equipments consisted of all kinds of devices used in the testing system; the other part …

The application of the regulations minimal solar collector area

Following the new regulations, a three bedrooms autonomous zone must have a minimal collector area of 4 m2 independently of the climate zone were is located. From the simulations results …

Measured sequences used for validation purposes

The comparison of experimental and calculated instantaneous power results, obtained after the different approaches presented in the previous section, is based on instantaneous efficiency measurements for a CPC collector (C …

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