Evaluation of Basic Operational Parameters of Evacuated Tube Solar Collectors

Abstract

The paper presents the results of a comparison of selected basic operating parameters of solar collectors with heat pipe vacuum tubes. During the evaluation were considered parameters, which are represented by the thermal efficiency and incidence angle modifier. The correct understanding of mentioned parameters allows the appropriate use of selected collectors within the various climatic conditions during their operation. The measurements were carried out on apparatus that allowing changes in the flow parameters and the angle of incidence of solar radiation. Each individual measurements were carried out in a dynamic operation. Results of measurements are presented in form of curves for the each selected parameters for all solar collector combined.