Experimental Study, Modelling and Design of High-Temperature Ground Thermal Energy Storage for Achieving Energy Efficient Building Energy Systems

实现节能建筑能源系统的高温地面热能储存的实验研究、建模和设计

• 批准号: RGPIN-2017-04688
• 负责人: Leong, Wey
• 金额: $ 1.6万
• 依托单位: Ryerson 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=759667
• 关键词: Experimental; Study; Modelling; Design; Temperature

A key technology in energy efficiency and conservation is a thermal energy storage system. It often helps to reduce the mismatch between demand and supply of thermal energy in a system, thereby improving its efficiency. Thus, a ground thermal energy storage (GTES), readily available under a building, backyard or front yard, can play an important role in the future to combat climate change, reduce fossil fuel consumption, and increase renewable energy utilization. The technology can also be extended to communities through district heating systems, as is the case at the one-of-a-kind Drake Landing Solar Community in Okotoks, Alberta. Here, 90% of residential space heating needs for 52 houses have been met since 2007 by retrieving solar energy stored during the summer season from a high-temperature (up to 80C) ground thermal energy store. The equivalent reduction is approximately 39 GJ of heating energy (or 1,050 m3 of natural gas) and 2 tonnes of greenhouse gas emissions per home, per year. In order to widely use such technology in Canada and the world, a reliable tool is required to simulate and design an optimized system in the most energy- and cost-efficient way. The proposed research will develop such a reliable and powerful computer software tool. The software program will have the capability to simulate the complex nature of coupled heat and water movement in the ground, as well as phase change process of phase change materials (PCMs) around ground heat exchangers, such that an appropriate sizing of a ground thermal energy storage system can be achieved - that is, it will be able to match the demand (e.g., heating for buildings) and supply (e.g., solar energy from solar collectors) of thermal energy over a typical service life of 20 years or longer. To meet this objective, experiment and modeling work will be required to validate or model the theory of coupled heat and moisture movement in soils and soil thermal properties. Once developed and validated, all the models will be implemented into a computer program for studying different GTES systems, including ground source heat pump (GSHP), hybrid GSHP, and high-temperature GTES systems.

能源效率和节约的一项关键技术是热能存储系统。它通常有助于减少系统中热能供需之间的不匹配，从而提高其效率。因此，在建筑物、后院或前院下随时可用的地面热能储存（GTES）可以在未来应对气候变化、减少化石燃料消耗和增加可再生能源利用方面发挥重要作用。该技术还可以通过区域供热系统扩展到社区，例如阿尔伯塔省奥科托克斯独一无二的 Drake Landing 太阳能社区。自 2007 年以来，这里通过从高温（高达 80 摄氏度）地面热能储存库中回收夏季储存的太阳能，满足了 52 栋房屋 90% 的住宅空间供暖需求。相当于每个家庭每年减少约 39 GJ 的热能（或 1,050 立方米天然气）和 2 吨温室气体排放。为了在加拿大和世界范围内广泛使用此类技术，需要一种可靠的工具以最节能和最具成本效益的方式模拟和设计优化的系统。拟议的研究将开发这样一种可靠且功能强大的计算机软件工具。该软件程序将能够模拟地下热量和水运动耦合的复杂性质，以及地下热交换器周围相变材料（PCM）的相变过程，从而适当确定地下热能的大小可以实现存储系统 - 也就是说，它将能够在 20 年或更长的典型使用寿命内满足热能的需求（例如，建筑物供暖）和供应（例如，来自太阳能集热器的太阳能）。为了实现这一目标，需要进行实验和建模工作来验证或模拟土壤中热湿耦合运动的理论和土壤热特性。一旦开发和验证，所有模型将被实施到计算机程序中，用于研究不同的 GTES 系统，包括地源热泵 (GSHP)、混合 GSHP 和高温 GTES 系统。