EuroSun2008-5

Emulated water supply mains

The energy balance of the storage tank is drawn a number of times within the course of the efficiency test of SDHW systems. This is achieved by means of highly accurate temperature sensors in the inlet and the outlet of the storage tank.

Doing this more than the entire volume of water of the storage tank is exchanged. This needs a large amount of fresh water.

The new testing laboratory is independent from the water supply mains. Those are emulated by a cold-water-buffer-tank in combination with a process thermostat having an adequate and sufficient cooling power.

This setup provides advantages to carry out the necessary measurements and experimental investigations.

It is possible to adjust the inlet temperature into the storage tank. That way, the cold water inlet temperature will be exactly the same between two tests. This enhances the reproducibility of the tests. Especially regarding the test of the “ability of the solar plus supplementary system to cover the load” mentioned above. This test is sensible to the cold water inlet temperature.

The adjustment of the cold water inlet temperature is possible with a very high accuracy (0.1 K). That is a basic requirement for the testing of heat storages according prEN 12977-3 [2]. Thus it is possible to not only perform the testing of SDHW systems but also of heat storages.

Measuring errors due to a fluctuating water inlet temperature are reduced. The public water main supply is not always at a constant temperature.

The closed circuit can b

e vented. Measuring errors due to air bubbles in the water mains supply are decreased.

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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