Foundational Design Rules for Solid-Liquid Phase Change Material - Heat Exchanger (PCM-HX)

固液相变材料 - 热交换器 (PCM-HX) 的基本设计规则

• 批准号: RGPIN-2019-05678
• 负责人: Groulx, Dominic
• 金额: $ 1.97万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760183
• 关键词: Foundational; Design; Rules; Solid; Liquid

The use of phase change materials (PCMs) based Latent Heat Energy Storage Systems (LHESS) is an area of increased research/commercial interests; offering solutions to the problem of conflicting time-dependency of the availability and demand of energy as well as temperature management. Such a technology will play a bigger role with today's push for increased renewable/sustainable energy production in our society's energy mix, for example: solar domestic hot water systems, cold storage from night time excess energy for air conditioning and refrigeration needs, PCMs in buildings enhancing overall energy efficiency, thermal storage in energy production systems, and PCM-LHESS used for temperature control of various electronic devices. At the heart of a large variety of LHESS is a fluid-to-PCM heat exchanger (HX) to move the energy in/out of the storage system; composed of pipes, or channels, fins, baffles, etc.; similar to HX used for more traditional fluid-to-fluid heat exchange with the exception that now, PCM fills one side of the heat exchanger. Traditional HX have well defined and accurate design rules (e-NTU, LMTD, design handbooks) based on decades of experimental work to guide in design selection. However, no design rules exist for PCM-HX. Numerical modeling still cannot be used for the complete characterization of a real complex 3D LHESS, so new design must be tested experimentally, by varying geometrical, material and operational parameters, resulting in a long and costly process, with no guarantee that an economical and functional design will ultimately be found. This explains why very few LHESS are commercially available today! Therefore, the determination of design rules for PCM-HX systems is the single most important advancement required in the field of thermal storage with PCMs, and through enabling faster designs of LHESS, leading to proof of concepts and technological adoptions, will also greatly help the economic case to be made for such systems. The main goal of my research program is to answer the relevant conceptual questions required to comparatively characterize different PCM-HX and use the comparative figures to determine foundational design rules for PCM-HX used for LHESS. To achieve this goal, five different PCM-HX geometries will be studied and characterized using a benchtop experimental setup already built in the applicant's lab. Data related to the heat transfer rates, temperatures in the system, flow rates and pressure drops will be measured. With all the experimental results, work will be done on determining the right parameters to be used to compare the performance of each PCM-HX, and from this, develop novel rules and theory to assist in the design and selection of PCM-HX for given applications. The determination of design rules will serve as a foundation for the area of PCM-HX systems, enabling faster and more economical designs and applications. This will have a transformational impact in the industry.

基于相变材料（PCM）的潜热储能系统（LHES）的使用是增加研究/商业利益的领域；为能源的可用性和需求以及温度管理的时间依赖性矛盾的问题提供解决方案。这样的技术将在当今社会的能源组合中提高可再生/可持续能源生产的推动力，例如：太阳能家用热水系统，夜间的冷藏超过空调和制冷需求，建筑物中的PCMS增强了能源效率的PCM，增强了整体能源储存，能源生产系统中的热量存储以及用于各种电子设备的温度控制的PCM-LHESS。各种各样的LHES的核心是流体到PCM热交换器（HX），可以将能量移入存储系统中。由管道，通道，鳍，挡板等组成；类似于用于更传统的流体到流体热交换的HX，但PCM现在充满了热量交换的一侧。传统的HX根据数十年的实验性工作来指导设计选择，具有明确且准确的设计规则（E-NTU，LMTD，设计手册）。但是，PCM-HX不存在设计规则。数值建模仍然不能用于对真实复合物3D LHESS的完整表征，因此必须通过改变几何，材料和操作参数来实验测试新设计，从而导致长期且昂贵的过程，而无法确保最终可以找到经济和功能设计。这解释了为什么今天很少有市场可用！因此，确定PCM-HX系统的设计规则是使用PCM的热存储领域所需的最重要的进步，并且通过实现更快的LHES设计，从而实现了概念和技术采用的证明，也将极大地有助于为这种系统做出经济案例。我的研究计划的主要目标是回答相对表征不同的PCM-HX所需的相关概念问题，并使用比较数据来确定用于LHESS使用的PCM-HX的基础设计规则。为了实现这一目标，将研究五个不同的PCM-HX几何形状，并使用已在应用程序实验室内构建的台式实验设置进行表征。将测量与传热率，系统温度，流速和压降下降有关的数据。有了所有实验结果，将在确定适当的参数以比较每个PCM-HX的性能方面进行的工作，并从中制定新颖的规则和理论，以协助为给定应用程序设计和选择PCM-HX。设计规则的确定将成为PCM-HX系统领域的基础，从而更快，更经济的设计和应用。这将对行业产生变革性的影响。