Revisiting the role of thermal energy storage in low-temperature electrified district heating systems

IF 1.6 Q4 ENERGY & FUELS
Hai Lu, Hao Zhang, Shuai Lu
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Abstract

Decarbonising the energy supply system is crucial to mitigate climate challenges. An emerging type of the multi-energy system, that is, the low-temperature electrified district heating system is gaining increasing popularity as a potential solution for future low-carbon heat supply. This paper investigated its operational optimisation with thermal energy storage (TES) installed at building sides. The optimisation model was to obtain the minimum operation costs of all heat pumps in this system. The TES was meant to achieve energy arbitrage through load shift, but it was observed from the optimised results that the TES did not play an active role in the optimisation. Five possible causes were identified and further investigated to reveal their impacts on the optimisation process. Results showed that the thermal capacitance, thermal resistance, and indoor temperature range of the building were major influencing factors, while the electricity price tariff and heat loss parameters of TES were minor ones. The results indicate that there is no need to equip the TES for operational optimisation purposes when the building thermal capacitance is larger than a threshold value, the thermal resistance is smaller than a threshold value, or the indoor temperature range is broader than a threshold value. These threshold values are case-specific and can be determined with the simulation model and method developed in this paper.

Abstract Image

重新审视低温电气化区域供热系统中热能储存的作用
使能源供应系统脱碳对于缓解气候挑战至关重要。作为未来低碳供热的潜在解决方案,一种新兴的多能源系统,即低温电气化区域供热系统越来越受欢迎。本文研究了其运行优化与热储能(TES)安装在建筑侧面。优化模型是为了获得该系统中所有热泵的最小运行成本。TES旨在通过负荷转移实现能源套利,但从优化结果中观察到TES并未在优化中发挥积极作用。确定了五个可能的原因,并进一步调查了它们对优化过程的影响。结果表明:建筑热容、热阻和室内温度范围是主要影响因素,而TES的电价和热损失参数是次要影响因素。结果表明,当建筑物热容大于阈值、热阻小于阈值或室内温度范围大于阈值时,无需配置TES进行运行优化。这些阈值是具体情况的,可以用本文开发的仿真模型和方法确定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IET Energy Systems Integration
IET Energy Systems Integration Engineering-Engineering (miscellaneous)
CiteScore
5.90
自引率
8.30%
发文量
29
审稿时长
11 weeks
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