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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=678685
• 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.

能源效率和节能的关键技术是热能储存系统。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暖系统扩展到社区，就像阿尔伯塔奥科托克斯独一无二的德雷克登陆太阳能社区的情况一样。自2007年以来，通过从高温（高达80 ℃）的地面热能储存器中获取夏季储存的太阳能，52栋房屋90%的住宅空间供暖需求得到了满足。相当于减少约39吉焦的热能（或1,050立方米的天然气）和2吨温室气体排放量，每个家庭，每年。为了在加拿大和世界范围内广泛使用这种技术，需要一种可靠的工具来模拟和设计最节能和最具成本效益的优化系统。拟议的研究将开发这样一种可靠且强大的计算机软件工具。该软件程序将能够模拟地下耦合热和水运动的复杂性质，以及地热交换器周围相变材料（PCM）的相变过程，从而可以实现地面热能储存系统的适当尺寸-也就是说，它将能够匹配需求（例如，建筑物的加热）和供应（例如，来自太阳能收集器的太阳能）在20年或更长的典型使用寿命内的热能。为了实现这一目标，需要进行实验和模拟工作，以验证或模拟土壤中热湿耦合运动和土壤热特性的理论。一旦开发和验证，所有的模型将被实施到一个计算机程序，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。