Heat losses of large tray solar collectors with exposed evaporation surface

R R Avezov F Sh Kasimov

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Heat losses of large tray solar collectors with exposed evaporation surface

机译：蒸发表面裸露的大型托盘太阳能集热器的热损失

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An analytic expression for determining the heat losses from the exposed surface of large tray solar water heating collectors via evaporation is proposed, and a numerical example of its practical implementation is presented. [PUBLICATION ABSTRACT]

机译：提出了通过蒸发确定大型托盘太阳能集热器裸露表面热损失的解析表达式，并给出了其实际实现的数值示例。 [出版物摘要]

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《Applied Solar Energy》 |2008年第4期|p.1-5|共5页
作者
R R Avezov F Sh Kasimov;
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收录信息美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
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专利

1. Solar radiation absorptance in tray solar water heating collectors with exposed evaporation surface [J] . N R Avezova F Sh Kasimov Applied Solar Energy . 2009,第4期

机译：蒸发表面裸露的托盘式太阳能集热器中的太阳辐射吸收率
2. Solar Radiation Absorptance in Tray Solar Water Heating Collectors with Exposed Evaporation Surface [J] . N. R. Avezova, F. Sh. Kasimov Applied solar energy . 2009,第4期

机译：蒸发表面裸露的托盘式太阳能热水收集器的太阳辐射吸收率
3. Broadband Coefficient of Absorption of Solar Radiation by Water Layer in Tray Water Heating Collectors with Exposed Evaporation Surfaces [J] . R. R. Avezov, F. Sh. Kasimov, O. S. Ruziev Applied solar energy . 2012,第2期

机译：蒸发表面裸露的盘式集水器中水层吸收太阳辐射的宽带系数
4. CONVECTIVE HEAT TRANSFER FROM EXPOSED FLAT HORIZONTAL SURFACE IN OUTDOORCONDITIONS AT LOW WIND SPEEDS: AN APPLICATION TO FLAT PLATE SOLAR COLLECTOR [C] . Suresh Kumar, S.C.Mullick . 2007

机译：低风速室外条件下暴露的水平平面的对流换热：在平板太阳能集热器中的应用
5. Natural convection loops providing overheat protection in flat-plate collector and integral-collector storage solar water heating systems. [D] . Roberts, Jon Paul. 2004

机译：自然对流回路可为平板集热器和整体集热器存储的太阳能热水系统提供过热保护。
6. SOLAR COLLECTORS SELECTIVE SURFACES AND HEAT ENGINES [O] . H. Tabor 1961

机译：太阳能收集器选择性表面和热引擎
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

Heat losses of large tray solar collectors with exposed evaporation surface

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