The wall plug for attaching e.g. plasterboard (2) to old masonry (3) has arms (5) at the top which are spread when the screw (1) is tightened. These support the board and compensate for unevenness in the wall.HAASE, JOCHEN
A linear structured heat exchanger (3) is arranged in an air duct of the receiver, made of ceramics and insulated by a temperature-stable insulating jacket. Ventilators are sectionally arranged in the air duct for moving hot air, where the solar-thermally produced hot air is mixed with ...
In contrast, the porosity generated by the incorporation of PMHS increases when going from low-level to high-level conditions and affects the maximum size of the pores being generated, with a maximum value achieved at 0.6% dosage, 40 s, and 140 °C conditions. The presence of an optimal ...