Thermal storage system optimization toward the economic viability of heating systems in Yanqing Winter Olympics Village

doi:10.19799/j.cnki.2095-4239.2024.0158

Abstract

Abstract:

To enhance the operational economy of heating systems in winter sports venues after the Olympics, a physical-mathematical model of the thermal storage device from the venue's heating system's was constructed. Numerical simulation methods were employed to study the thermal storage device. The simulated results of temperature stratification within the thermal storage device were compared and analyzed against field-measured data, validating the accuracy of the model. The structure and temperature scheme of the thermal storage device were optimized by leveraging the local peak-valley electricity price system, aiming to optimize the operating costs of electrode boilers, with constraints the cavitation margin of the heat release pump and the total power of the electrode boiler. The influence of the thermal storage device's manifold distributor structure and thermal storage media temperature on the energy conservation and the economic viability of the heating system were investigated. Results indicate that the designed diffuser-type manifold distributor structure outperforms the manifold distributor structure in the Yanqing Winter Olympics Village's thermal storage device, as it exhibits superior temperature stratification within the thermal storage device during operation. This results in lower mixing of the thermal storage media at different temperatures within the device, which, in turn, lead to higher outlet temperatures and further improvement of the room comfort. The heating efficiency improved from 82.02% to 85.98% after optimization. During the period from winter solstice to New Year's day, the optimal temperature of the thermal storage media was 95 ℃, leading to a reduction in the operational costs of the electrode boiler heating system by up to 14.13%. This work highlights the value of engineering applications and provides guidance for post-Olympic venue operations and operational improvements in thermal storage heating systems.

Key words: Winter Olympic venues, heating system, thermal storage devices, performance optimization, economics

CLC Number:

TU 822

Lie FAN, Yongjie XING, Fang LIU, Yaxuan XIONG. Thermal storage system optimization toward the economic viability of heating systems in Yanqing Winter Olympics Village[J]. Energy Storage Science and Technology, 2024, 13(6): 2057-2067.

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设备名称	型号参数	数量/台
电极锅炉	功率4 MW/10 kV	4
锅炉循环泵	流量137 m³/h，扬程15 m，功率7.5 kW/380 V	8(4用4备)
供热循环泵	流量310 m³/h，扬程18 m，功率22 kW/380 V	3(2用1备)
储热循环泵	流量200 m³/h，扬程17 m，功率15 kW/380 V	3(2用1备)
放热循环泵	流量147 m³/h，扬程17 m，功率11 kW/380 V	3(2用1备)
储热装置1	总容积651 m³	1
储热装置2	总容积405 m³	1

名称	具体操作
模型绘制	对图2所示装置结构进行三维物理模型绘制
模型处理	对模型进行流体域、固体域以及进出口边界的划分
网格划分	对模型进行网格划分，采用多面体网格形式，对装置内管道及进出口处进行局部加密处理

电价阶段	时间段	电费/(元/kWh)
峰电价阶段	10: 00—15: 00(第一阶段)、18: 00—21: 00(第二阶段)	1.154337
平电价阶段	7: 00—10: 00(第一阶段)、15: 00— 18: 00(第二阶段)、21: 00—23: 00 (第三阶段)	0.839955
谷电价阶段	23: 00—次日7: 00	0.554529

参数	优化后	优化前
累计放热量/kJ	41711369.09	39793037.48
热利用效率	85.98%	82.02%

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