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）的潜热能量存储系统（LHESS）的使用是增加的研究/商业利益的领域;为能量的可用性和需求以及温度管理的冲突的时间依赖性的问题提供解决方案。这种技术将发挥更大的作用，随着当今社会能源结构中可再生/可持续能源生产的增加，例如：太阳能家用热水系统，用于空调和制冷需求的夜间多余能源的冷存储，建筑物中提高整体能源效率的PCM，能源生产系统中的热存储，以及用于各种电子设备温度控制的PCM-LHESS。各种LHESS的核心是流体-PCM热交换器（HX），用于将能量移入/移出存储系统;由管道或通道、翅片、挡板等组成;类似于用于更传统的流体-流体热交换的HX，不同之处在于，现在PCM填充热交换器的一侧。传统HX基于数十年的实验工作，具有定义明确且准确的设计规则（e-NTU，LMTD，设计手册），以指导设计选择。然而，PCM-HX没有设计规则。数值建模仍然不能用于真实的复杂三维LHESS的完整表征，因此必须通过改变几何、材料和操作参数对新设计进行实验测试，这导致了一个漫长而昂贵的过程，无法保证最终会找到经济实用的设计。因此，确定PCM-HX系统的设计规则是PCM热存储领域所需的最重要的进步，并且通过实现LHESS的更快设计，导致概念和技术采用的验证，也将极大地帮助为此类系统做出经济案例。我的研究计划的主要目标是回答相关的概念性问题，比较不同的PCM-HX的特点，并使用比较数字来确定用于LHESS的PCM-HX的基本设计规则。为了实现这一目标，五种不同的PCM-HX几何形状将使用申请人实验室中已经建立的台式实验装置进行研究和表征。将测量与传热速率、系统温度、流速和压降相关的数据。根据所有的实验结果，将确定用于比较每个PCM-HX性能的正确参数，并从中开发新的规则和理论，以帮助设计和选择特定应用的PCM-HX。设计规则的确定将成为PCM-HX系统领域的基础，从而实现更快、更经济的设计和应用。这将对行业产生变革性影响。