Focusing groove type solar thermal absorber of single side multi-longitudinal whorl strengthened heat exchange

Abstract

A focus trench solar heat absorber with heat exchange enhanced by one-sided multi-longitudinal vortices comprises an glass outer tube and a stainless steel receiving inner tube encapsulated inside theglass outer tube by a connection end, a vacuum cavity is formed between the glass outer tube and the stainless steel receiving inner tube, the outer wall of the stainless steel receiving inner tube is coated with a coating which can selectively absorb sunlight, a discontinuous multi-longitudinal vortex generator which is convex or concave towards the inner tube is arranged at one side of the tubewall of the stainless steel receiving inner tube, that is, the hot flow side for receiving the focus solar energy; the discontinuous multi-longitudinal vortex generator is arranged at one side of thehot flow side (which has a great temperature gradient) for receiving the focus solar energy. The heat absorber aims at the discontinuous multi-longitudinal vortex generator arranged at the single side of the focus solar heat flow receiving side, a longitudinal vortex dynamic structure is formed inside the tube near the wall at the one side, thus improving the synergetic degree of a velocity fieldand a heat flow field and enhancing the convection heat exchange of a fluid inside the tube. Meanwhile, the heat absorber has better enhanced heat exchange effect compared with generators arranged ata smaller temperature gradient side under the situation of increasing the same flow resistance, and the one-side arrangement can achieve the high-efficiency and low-resistant enhanced heat exchange effect and the purpose of saving energy and lowering energy consumption.

Description

technical field [0001] The invention belongs to the technical field of solar heat utilization, and in particular relates to a single-side multi-longitudinal vortex-enhanced heat exchange focusing trough solar heat absorber which can effectively improve the efficiency of solar heat utilization. Background technique [0002] At present, in the receiver pipes of the existing focusing trough solar collectors, measures to enhance heat transfer are seldom used for strengthening, or the surrounding layout schemes such as capillary structure and concave-convex corrugated structure are used for strengthening. The heat exchange increases the flow resistance at the same time, that is, increases the pump power consumption, which makes the operating income of the system relatively lower. This may be due to insufficient consideration of the special circumstances of the technical field. The research shows that the circumferential energy flow density distribution on the receiving tube surf...

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Problems solved by technology

In the case of a large heat collector with a high focus energy flow density, the extremely uneven distribution of the energy flow causes a large temperature difference in the circumferential and axial directions of the heat sink of the heat collector, and the resulting thermal expansion has a great impact on the collector. The performance of the heater itself will adversely affect the

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