Material selection and exposure

After a market analysis, which included all major distributors, a selection of 58 collector glazing types were chosen in the beginning of this long-term investigation (1984). An overview of tested samples is given in Table 1. These glazing types cover a variety of different material and plate types. Although the selection was made in 1984, the results still provide important information regarding the materials currently available on the market.

Table 1. Summary of the tested materials with the corresponding solar transmittance values.


Number of Glazing Types

Solar Transmittance

Low Fe glass

8 (flat)


Fe containing float glass

8 (flat)


6 (flat)


PMMA Polymethylmetacrylat

6 (multi-skin)


5 (3 sinuous, 2 fiber reinforced)


5 (flat)


PC Polycarbonate

5 (multi-skin)


2 (films)


ETFE Ethylene-tetrafluoroethylene

3 (films)


FEP Fluorinated ethylene-propylene

2 (films)


PVF Polyvinylchlorid

1 (film)


PET Polyethylene teraphtalat

2 (films)


PVC Polyvinylchlorid

2 (films)

1 (special plate)



UP Unsaturated polyester

3 (fiber reinforced, 2 of them sinuous)


Two exposition sites with different climatic conditions were chosen (see Table 2.); Rapperswil representing a sub-urban location is home of the SPF institute. The alpine site of Davos is characterized by higher irradiation and lower temperature and air pollution.

Table 2. Main climatic parameters of the exposition sites.



CH-8640 Rapperswil


CH-7260 Davos Dorf


Подпись: 1556 AMSLПодпись: 1381 kWh/m2 per year 84.6 kWh/m2 per year 2.61 kWh/m2 per year 3.1 °C Rural/Forrestal Low pollution


Total annual insolation Annual UVA insolation Annual UVB insolation Yearly mean temperature Site character Air pollution sources
417 AMSL

1093 kWh/m2 per year 60.7 kWh/m2 per year 2.08 kWh/m2 per year

9.3 °C Suburban

Train station and industries

Five samples of each glazing type were exposed at the two sites. Each sample covered a “mini collector” [1] which consists of a non-insulated box of solar selective coated stainless steel facing south at an inclination of 60°. One sample from each type was collected, analyzed and stored following 40 days, 1, 3, 10 and 20 years of exposure.


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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