G. Zorer Gedik1* and A. Koyun2 1Yildiz Technical University, Architecture Faculty Istanbul /Turkiye2Yildiz Technical University, Mechanical Engineering Fac., Istanbul /Turkiye,Corresponding Author, gzorer@hotmail. com Abstract In this study the experimental results of a solar energy collector which is installed to a south classroom window of a school in Istanbul are presented. The collector unit had been […]

After a year of operation several distinct patterns in the development of cracks in the evacuated tubes emerged. One of these involved the production sequence or, equivalently, the fin orientation and the other, the end of the tube where the crack occurred. Vertical and horizontal tube absorber orientations were produced in the first and second […]

Calculations with different glass tube radius are carried out. Other parameters are here changed as well: For the collectors with the curved absorbers, the glass tube centre distance and the radius of the absorber fins are changed as well. For the collectors with the flat fins the glass tube centre distance and the width of […]

In the 80s decade there was made an important investment in solar collector technology in Portugal but some problems related with an insufficient developed technology and inexperienced installer firms have been created a negative image on the public eye. On the year of 2000, some studies estimated that Portugal had installed 239 500 m2 of […]

In order to determine the efficiency parameters of solar thermal collectors according to ISO 9806 or EN 12975, two different procedures can be used: the steady state test method and the quasi dy­namic test method. During the steady state test, all boundary conditions such as solar radiance, ambient temperature and collector inlet temperature must be […]

The spectral method is based on analyzing the transient temperature changes in the collector circuit after the pump is started [5; 6]. Temperature signals on a secondly basis are transformed with a Fourier transformation in the spectral range. A failure free training phase results in a characteristic vector and an uncertainty boundary. A measured vector […]

1.1. Case-study buildings Two case study buildings were considered. Case-study 1 is a T1 apartment (with one bedroom) located in the ground floor of a 6-floor apartment building [4]. The second case-study is a T3 detached dwelling (three bedrooms). Table 2 presents for each the main characteristics influencing their thermal behaviour. 1.2. Climatic regions / […]

Figure 4: Tracker under the solar simulator during indoor testing The solar simulator’s lamp field consists of sixteen 1500 W metal halide lamps. In addition to the vertical and tilt movements, it is also possible to move the lamp field horizontally on the cantilever. This is necessary, as the tracker is mounted on tracks, which […]