Numerical simulation on application of water/Al2O3 nanofluid in heat transfer enhancement in microchannel heat exchanger of solar collectors developed by Solar Tomorrow Inc

Solar Tomorrow Inc开发的水/Al2O3纳米流体在太阳能集热器微通道换热器强化传热中的应用数值模拟

• 批准号: 485011-2015
• 负责人: Saghir, Ziad
• 金额: $ 1.82万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=584652
• 关键词: Numerical; simulation; application; water; Al2O3

In this ENGAGE project, we propose to numerically model the application of water/Al2O3 nanofluid in heat transfer enhancement in a microchannel heat exchanger used in solar thermal collectors. One of the main problems that the international community faces today is lowering the level of greenhouse gas (GHG) emissions caused by energy generation (both heat and electricity). Renewable energy sources are the key to minimizing environmental impact and reducing emissions level during the heat generation process. Solar thermal technology currently offers efficiency of conversion of solar energy to heat in the range of up to 80% that places the solar thermal technology at the position to dominate the future market for renewable heat. To satisfy the need for innovative solar thermal systems Solar Tomorrow Inc. developed a new kind of building integrated solar thermal collectors based on a proprietary microchannel technology. The collectors achieve high efficiency and are seamlessly integrated into buildings' envelope. The main goal of this project is to further increase efficiency of the microchannel solar thermal collectors by maximizing the heat transfer in the liquid domain of the microchannel heat exchanger to improve the efficiency and heat generation from the entire solar thermal system. The improvement can be achieved by the use of nanofluid. Nanofluid is a terminology for a base fluid material containing one or more than one kinds of nanoparticles. Usually, the nanoparticles that are used in nanofluid are made of metals, carbides, carbon nanotubes or oxides.Metallic nanofluids may enhance the heat transfer in fluid domain because of the thermal physical properties of the nanoparticles. Increase in the volume fraction or concentration of nanoparticles may cause increase in the heat transfer in the liquid domain till a certain volume fraction Depends on the size and average temperature of the solar collectors there would be an optimized volume fraction of the nanoparticle that increases the heat transfer in the microchannel

在这个ENGAGE项目中，我们建议数值模拟应用水/Al 2 O3纳米流体在太阳能集热器中使用的微通道热交换器中的传热增强。国际社会今天面临的主要问题之一是降低能源生产（热和电）造成的温室气体排放水平。可再生能源是最大限度地减少环境影响和降低发热过程中排放水平的关键。太阳能热技术目前提供高达80%的太阳能到热量的转换效率，这使得太阳能热技术处于主导未来可再生热量市场的地位。为了满足创新太阳能热系统的需求，Solar Tomorrow Inc.开发了一种基于专利微通道技术的新型建筑一体化太阳能集热器。收藏家实现高 效率和无缝集成到建筑物的外壳。该项目的主要目标是通过最大化微通道热交换器的液体区域中的热传递来进一步提高微通道太阳能集热器的效率，以提高整个太阳能热系统的效率和产热。这种改进可以通过使用纳米流体来实现。纳米流体是含有一种或多种纳米颗粒的基础流体材料的术语。纳米流体中的纳米颗粒通常由金属、碳化物、碳纳米管或氧化物等组成，由于纳米颗粒的热物理性质，金属纳米流体可以增强流体区域的传热。纳米颗粒的体积分数或浓度的增加可以导致液体域中的热传递增加，直到一定体积分数。 纳米颗粒的最佳体积分数增加微通道中的热传递