Influence of Physical Characteristics οf Flat Aluminum Concentrators on Energy Efficiency of PV/Thermal Collector

Abstract

In this paper the results of the influence of physical characteristics of flat plate solar radiation concentrators made of Al sheet and Al foil on energy efficiency of PV/thermal collector are presented. The measurements results obtained by means of scanning electron microscope, reflectance and chemical composition of solar radiation concentrators are given. Optimal position of solar radiation concentrators and appropriate thermal and electrical energy of PV/thermal collector were determined. Total generated thermal and electrical energy during the day by PV/thermal collector with concentrators in optimal position are higher than the total generated thermal and electrical energy obtained by PV/thermal collector without concentrators.

Fundamentals of designing hybrid concentrator solar systems

“…By using the calculated value of the standard solar insolation E = 1000 W · h / m2, we obtain an expression for the determination of the thermal energy received by heat transfer fluids flowing along the walls of collectors: 0.94 * * τ * 2 * * * ϑ (4) As a result, total thermal energy produced by CPVT system and transported to the boiler heat supply system amounts to: Q Q ≈ (4·Q f1 + 2·Q f2 )·ϑт + 2Q k .…”

“…The authors of [3] went around this drawback by using a low-temperature heat carrier capacity of the heat exchanger to preheat the salt water in the solar distillers, with the result that increase the productivity of fresh water produce at ≈ 30%. In [4] it is shown that with the use of PVT collector with aluminum reflectors mounted on both sides solar radiation intensity increases from ≈ 43% to ≈ 65%, generates electric power 17% higher, and the heat by 55% higher compared with PVT collectors without concentration. It is possible to increase of the heat transfer temperature with the use of GaAs solar cells [5], effectively operating in the temperature range up to 250 0 C, however, they have a small footprint and high cost.…”