2 documents found, page 1 of 1
One-Sun CPC-type solar collectors with evacuated tubular receivers
Osório, Tiago; Horta, Pedro; Marchã, João; Collares Pereira, ManuelThe collection of solar energy in the upper part (80–150 °C) of the low temperature range commonly relies on evacuated tubular collectors with or without a back reflector. The reflector is usually of the CPC type and designed for a collector concentration ratio below 1. Increasing the concentration ratio lowers thermal loss while limiting the collector acceptance angle. A hemispherical acceptance makes the inst...
Development and Test Results of a Calorimetric Technique for Solar Thermal Test...
Marchã, João; Osório, Tiago; Collares-Pereira, Manuel; Horta, PedroThermal heat transfer fluids (HTF) used in solar collectors (e.g. synthetic oils) are known to age and degrade [1]. This degradation is impossible to control, affecting the fluid heat transfer capacity and thus the ability of measuring the performance of an HTF heating device (e.g. a solar collector) based on known specific heat values. Collector testing is also crucially dependent on an accurate measurement of...