Experimental research on the all-glass evacuated tube solar air collector

Abstract

This paper is focus on the research of the thermal performance of all glass-evacuated tube solar air collectors by experiment. Two sections composed of inlets and outlets are formed by the inserted pipes with the target to heat the forced convection air by heat exchange with the vacuum pipes' inside surface. Solar radiance, work fluid flow rate, the static pressure difference between inlet and outlet, the temperature of ambient and inlet and outlet and ambient wind speed were measured in this experiment, for they are the factors that can effect the instance efficiency of solar air collector. The testing was finished based on the methods introduced in ASHRAE93-86 and ISO9806-2 standard.