EuroSun2008-5

Testing Of Pre-Assembled Solar Domestic Hot Water Systems And Heat Storages

Wolfgang Striewe*, Jan Steinmetz, Thomas Biel, Daniel Volker,

Korbinian Kramer, Stefan Mehnert, Matthias Rommel

Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstrahe 2, D-79110 Freiburg
* Corresponding Author, wolfgang. striewe@ise. fraunhofer. de

Introduction

Factory made and pre-assembled solar domestic hot water (SDHW) systems may provide a range of advantages in comparison with individually constructed systems. It is observed that the market share of these systems increases.

In the course of this trend the quality assurance of the products becomes more important. It is only profitable for the customer to install a SDHW system if it provides high solar gains over a long service and life-time.

Testing of these systems is done according to the testing standard EN 12976 at Fraunhofer ISE to ensure the quality of SDHW systems. It is the European testing standard for factory made thermal solar systems. Testing according to this standard is also part of the requirements to receive the Solar Keymark quality label.

It includes an outdoor test for the experimental determination of system parameters. These parameters are used to make a performance prediction by means of a computer simulation. Furthermore, several quality tests are carried out. These include the testing of the stagnation behavior of the SDHW system and other tests.

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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