太阳能储热桩取热过程中桩内温度变化的研究

Study on Temperature Change in the Solar Energy Storage Pile during Process of Heat Extraction

摘要:

首先介绍了太阳能地下混凝土储热桩热量利用率不足的现状，通过在已有太阳能混凝土储热桩传热模型的基础上，对不同取热工况中影响储热桩温度场变化的各种因素进行了传热过程的模拟分析，得出了持续取热及间断取热2种不同运行工况及热流密度、导热系数和比热容、埋管间距对桩内温度场变化的影响，然后合理的选择最优参数，分析桩内温度场的变化，提高取热效率，使混凝土桩内热量充分利用。

Abstract:

This paper first introduces the present situation of insufficient heat utilization ratio of solar energy in the underground concrete storage pile, and based on the existing equivalent model, stimulation analysis of heat transferring process is made on the factors affecting temperature field change under different heat extracting operation conditions. It is known that the temperature field change in heat storage pile is affected by different continuous & intermittent operation modes, heat flux, thermal conductivity, specific heat capacity and underground pipe space; and then optimal parameters are reasonable selected to reduce variation of soil temperature field and make full use of heat in concrete pile.