【摘 要】
：
The spectrally selective absorbing film plays a key role in determining the collecting capability of solar thermal en-ergy in the application of solar water heater.This research experimentally investi
【机 构】
：
Department of Aeronautics and Astronautics,National Cheng Kung University,Tainan,Taiwan
【出 处】
：
13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
The spectrally selective absorbing film plays a key role in determining the collecting capability of solar thermal en-ergy in the application of solar water heater.This research experimentally investigates influences of importance pa-rameters among spray coating process on the solar absorptance,thermal emittance and collection efficiency of the selective absorbing film.Selective parameters include thickness of the selective absorbing film,median diameters of the spray,and the frequency of the coating etc.Results show that thickness of the selective absorbing film has a strong effect on the absorptance and the emittance of the selective absorbing film.The optimum collection perfor-mance of the spectrally selective films with absorptance up to 93%while the emittance down to 65%can be achieved at a film thickness of 3.3 μm.Thus,properly selection of the film thickness results in the optimum compo-sition of the absorptance and the emittance and thus the optimum collection efficiency of thermal solar energy.Re-sults also show that higher median diameters of the spray can increase the absorptance and reduce the emittance,thus has a positive effect of the collection efficiency of thermal solar energy.It is caused by redistribution of carbon particles inside spray flow,the deposition effect onto a substrate,as well as the evaporation of the solvent.
其他文献
The objective of this study is to obtain a better understanding about the momentum rate of an industrial effervescent atomization.The spray is injected through an industrial patented effervescent nozz
High-frequency combustion instabilities have been proven to be extremely harmful to liquid rocket engine operation,even leading to the destruction of the combustion chamber.The coupling between acoust
The experimental characterization of two-phase flow regimes inside the mixing chamber of an effervescent atomizer is studied.Air was injected into a liquid water cross-flow through a single orifice lo
Modern gas-turbines employ fuel-air mixers that utilize jet-in-cross-flow(JICF)fuel-injection to achieve rapid fuel-air mixing.In recent years,air-assist JICF has been investigated to improve the atom
The effect of the nature of the suspender on heat transfer into an evaporating microliter pendant droplet is studied experimentally and numerically.Experimental studies show that there is an intrusive
Surfactant is commonly added to ink or paint as dispersive agents for pigment or dye.The surfactant also interferes with the atomization of the liquid sheet injected from a spray nozzle since it has s
Preferential concentration and clustering influences the heat and mass transfer for spray droplets.The effect of droplet clustering is of interest for many spray applications,e.g.in automotive spray c
progress variable approach is presented for the numerical simulation of a turbulent dilute ethanol/air spray flame.The standard spray flamelet formulation is revised in order to account for pre-vapori
The fuel-water internally rapid mixing type of injector has been developed to reduce NOx and soot emissions from combustion furnaces operating under high-load conditions.The injector allows spray inje
High-level Nitrogen oxides(NOx)released to the atmosphere cause health and environmental hazards.Conventional power plants are required to have NOx emission control systems to abide by local environme