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Mathematical modelling of the performance of photocatalytic decomposition of defined gaseous pollutants.

机译：定义的气态污染物光催化分解性能的数学模型。

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摘要

The photodegradation of formaldehyde by the photocatalyst titanium dioxide was studied using mathematical modelling and the physical application of photocatalytic oxidation (PCO) reactors in air conditioning systems. Two field PCO reactors (FM1 and FM2) were constructed that were suitable for the installation within common commercially available fan coil units within heating and cooling ventilation air conditioning (HVAC) systems. Due to the application within air conditioning systems the parameters chosen were between the temperatures 15-25°C and relative humidity 55% based upon traditional comfort levels common in Hong Kong. The further approximation of the Colebrook equation-specifically the Darcy-Weisbach equation, allowed for the calculation of the friction factor ƒ which led to evaluation of the turbulent pipe flow pressure loss in a straight duct. It was found that within the volumetric flow rate ranges (289-1876m3/h according to the commercial fan coil units used) and face velocity (which was less that 10m/s in low pressure duct work according to DW142) the pressure drop is less than 40 Pa which had an insignificant change on the air balance of the fan coil unit in the HVAC system. It was also appeared that the copper earthing mesh was required and placed five centre meters away from the PCO reactor which made it possible to prevent the static electricity build up on the titanium dioxide coating plate surface. It could be a potential safe guide device for limiting catalytic poison during the photo degrading process. The FM1 and FM2 PCO reactors could be used in common commercial fan coil unit in the existing HVAC system. The calibration and validation of the computing modelling were also used for the design optimisation, operation and control of the PCO system.;During the elimination of variables, it was found that the titanium dioxide coating on the aluminium supporting metal has no photocatalytic ability. It was also found that the UV light in PCO unit needs to be turn off for at least 30 min after 2 hours operation, then further photocatalysis can be obtained.
机译：利用数学模型以及光催化氧化（PCO）反应器在空调系统中的物理应用，研究了光催化剂二氧化钛对甲醛的光降解作用。建造了两个现场PCO反应堆（FM1和FM2），适用于安装在加热和冷却通风空调（HVAC）系统中常见的市售风机盘管中。由于在空调系统中的应用，所选择的参数在15-25°C的温度和55％的相对湿度之间（基于香港常见的传统舒适度）。进一步近似Colebrook方程，特别是Darcy-Weisbach方程，可以计算摩擦因数ƒ，从而可以评估直管中湍流管道的压力损失。发现在体积流量范围内（根据使用的商用风机盘管单位为289-1876m3 / h）和表面速度（根据DW142在低压管道工作中小于10m / s），压降较小大于40 Pa，这对HVAC系统中的风机盘管的空气平衡影响不大。似乎还需要铜接地网并将其放置在距PCO反应器5个中心米处，这可以防止静电积聚在二氧化钛涂层表面上。它可能是用于限制光降解过程中催化毒物的潜在安全引导装置。 FM1和FM2 PCO电抗器可用于现有HVAC系统中的普通商用风机盘管装置中。计算模型的校准和验证还用于优化PCO系统的设计，操作和控制。在消除变量期间，发现铝载体金属上的二氧化钛涂层没有光催化能力。还发现，在运行2小时后，必须关闭PCO单元中的紫外线至少30分钟，然后才能获得进一步的光催化作用。

著录项

  • 作者

    Chee, Chan Mo.;

  • 作者单位

    Hong Kong Polytechnic University (Hong Kong).;

  • 授予单位 Hong Kong Polytechnic University (Hong Kong).;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 281 p.
  • 总页数 281
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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