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Bridging the gap - research and experimental validation on the dst performance test method for solar domestic water heaters


European quality standards for Solar Domestic Hot Water (SDHW) systems are being prepared by the CEN Committee RC 312. The Dynamic system testing (DST) method is one of the methods chosen there to measure the energetic performances of these systems. An outdoor DST test on a SDHW system suffices to give predictions of the energetic performance for a whole year under various climates and circumstances.

The project objectives are:
- Comparison of the DST method to the 'CSTG' method, which is also used in the CEN, leading to correspondence factors which enable comparison of DST results with CSTG results.
- Fine-tuning of the present description of the procedure to an expected reproducibility of 5 to 10% with predictions for different climates and hot water consumption.
- Clear demarcation, definition and widening of the scope of the test method to allow for as many systems and conditions as possible.
- Experimental validation of the DST method by means of intercomparison tests in a number of recognised laboratories throughout Europe.
In the first year of the project, the project has booked progress almost according to schedule. Extensive calculations have been performed to localise and analyse weak spots of the DST methods. This work will expectedly result in recommendations to improve details of the test procedure. In order to broaden the scope of application of the DST method. Measurements in order to compare the CSTG method and the DST method will be discussed in the second meeting in December 1997. The actual experimental validation will start in 1998.

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