太阳能集中供热系统波动热输入下管道热响应分析

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
Baichao Wang , Yanfeng Liu , Dengjia Wang , Cong Song , Hongsen Chen
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引用次数: 0

摘要

为了解决太阳能集热器流体随时间变化的温度波动和SHDS内的阶跃加热温度引起的管道延迟响应和大量热损失,建立了伪动态热数值模型。研究了脉动热输入和温度阶跃变化条件下CLP和HDP的热响应特性。通过对多种影响因素与管道进口条件的耦合分析,量化了延迟响应时间、管道沿线温度下降和热损失的演化规律。结合外部动态边界条件进行回归分析。结果表明,白天CLP单位长度热损失峰值达到58.30 W/m,管道沿线温度下降约0.11°C。这些动态特性受太阳辐射强度和流体流速的协同控制。在进口温度阶跃变化过程中,出口温度延迟响应时间显著增加97 ~ 101 min。管道长度每增加1公里,延迟响应时间延长约12 min,流速每增加0.3 m/s,延迟响应时间缩短约14 min。管道长度延长对单位长度热损失影响最小,而保温厚度每增加5 mm,热损失减少1.9 ~ 3.4 W/m。研究表明,拟动力学模型能较准确地预测管道内的动态热行为,为太阳能集中供热管道的动态热管理、精确调节和节能设计提供参考依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal response analysis of pipeline under fluctuating heat input for solar district heating system
To address pipeline delay response and substantial heat loss caused by time-varying temperature fluctuations in solar collector fluid and step-change heating temperatures within SHDS, a pseudo-dynamic thermal numerical model was developed. The thermal response characteristics of the CLP and HDP under fluctuating heat input and temperature step-change conditions were investigated. Coupled analysis of multiple influencing factors and pipeline inlet conditions quantified the evolution patterns of delay response time, temperature drop along pipeline, and heat loss. Regression analysis incorporating external dynamic boundary conditions was conducted. The results indicated that peak heat loss per unit length in the CLP reached 58.30 W/m during daytime, with temperature drop along pipeline of approximately 0.11 °C. These dynamic characteristics were synergistically governed by solar radiation intensity and fluid flow velocity. During step-change in inlet temperature, the delay response time of outlet temperature increased significantly by 97–101 min. For each kilometer increase in pipe length, the delay response time extended by approximately 12 min, whereas a 0.3 m/s flow velocity increase reduced it by about 14 min. Furthermore, pipe length extension has minimal effect on heat loss per unit length, while every 5-mm increase in insulation thickness decreased heat loss by 1.9–3.4 W/m. The study demonstrated that the pseudo-dynamic model accurately predicted dynamic thermal behaviors in pipeline, providing a reference basis for dynamic thermal management, precise regulation, and energy-efficient design of solar district heating pipeline.
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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