Abstract :
The aim of this paper is to establish the heat transfer model of all-glass vacuum tube collector used in forced-circulation solar water
heating system. In this model, the simplified heat transfer of collector is composed of the natural convection in single glass tube and
forced flow in manifold header. Thus the heat balance equation of water in single tube and the heat balance equation of water in manifold
header have been established. The flow equation is also built by analyzing the friction and buoyancy in tube. Through solved these
equations the relationship between the collector average temperature, the outlet temperature and natural convection flow rate have been
obtained. From this relationship and energy balance equation of collector, the collector outlet temperature can be calculated. The validated
experiments of this model were carried out in winter of Beijing.
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