1.1 Parabolic body The stainless steel body is designed by four parabolic shaped ribs (two L-shaped and two T – shaped) which are screwed with two side plates and a trough sheet. Thus the corpus is built of seven components hold together by numerous screws. This results in a long assembly time and high expenditure […]

We can choose different shapes for the static concentrators useful surfaces. Using some software which allow the simulation of the light rays way is convenient. For this paper we chose a paraboloidal concentrator. The rotation paraboloid equation is (Fig.1) x2 + y2 – 2a2z = 0 (1) where, a is the radius of the circle […]

The system used for the solar absorbers’ testing is a laboratory scale system for domestic hot water heating (E 202, Gunt Germany). The stand image and its components are presented in Fig. 1. The commercial stand consists of a flat plate collector with the absorber plate fixed on the heating serpentine. The device was modified […]

Theoretical modeling was done applying a software generated by AEE INTEC (Gleisdorf, AUT), which provides a comprehensive theoretical mathematical description of flat-plate solar collector performance [4]. It allows for the evaluation of collector conversion factors and for the determination of efficiency graphs. For the present investigation specific functional elements, such as thermotropic layers have been […]

Performance of ICS solar water heater was compared with natural circulation type solar water heater. Natural circulation type solar water heater consist of a flat-plate collector made of copper fin having absorber area 1.9 m2 and doubled walled storage tank of 100 litres capacity. The detailed design has been described by Nahar [16]. Both the […]

Titanium oxide films were deposited on glass and metallic substrates with dc magnetron sputtering and also with pulsed dc magnetron sputtering at room temperature from 7.5mm titanium target with 99.995% purity, in reactive atmosphere with mix of argon and oxygen gas. The sputtering was carried out using a 5kW power supply, with possibility to change […]

The heat loss coefficient UL is determined according to Section 2.3 for the measurements with the reference collector (not ventilated) and a collector tilt angle of 45° (data of June 10, 2006). The slope U2 and the interception with the y-axis U are found by linear regression, see Fig. 6 (a, b). In the case […]

The used absorber system is built of a standard sydney tube (see Fig. 4). This kind of absorber con­sists of a double walled glass pipe (1 and 2) with an evacuated annular gab. This reduces heat losses due to heat convection and heat conduction. On the outer surface of the inner glass wall (2), a […]