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            暖通空調雜志社>期刊目次>2021年>第9期

            基于基坑肥槽的地道風節能技術研究

            Energy saving technology of tunnel air based on foundation pit trenches

            王勝男[1] 鞏云[2] 劉強[2] 高夕良[2] 袁艷平[3]
            [1]中鐵二院工程集團有限責任公司 [1]西南交通大學 [2]中鐵二院工程集團有限責任公司 [3]西南交通大學

            摘要:

            探究了不同基坑支護形式下的肥槽斷面差異,發現基坑肥槽內有大量“免費”空間可用來埋管或敷設土建風道,且隨著基坑深度的增加,肥槽體積呈倍數增長,非常適合地道風技術的應用。以南寧地區某車庫地道風項目為例,利用MATLAB軟件采用二維穩態傳熱模型簡化計算了地道風熱傳遞過程。模擬結果表明,覆土3 m以下空間全年土壤溫度波動很小,且隨著埋深的增加,土壤熱惰性效應越發明顯,埋深6 m處全年最高溫度出現在12月,實現了很好的跨季節蓄熱。同時,隨著地道長度的增加,單位長度地道的降溫能力明顯下降,從經濟合理性考慮,建議系統管路不宜超過300 m。與多聯機系統進行對比,地道風系統年均可節電約13萬kW·h,靜態回收期約6.7 a,全壽命周期內節能效益顯著。

            關鍵詞:基坑肥槽,地道風,數學模型,車庫,節能分析

            Abstract:

            Investigates the difference of the foundation trench section under different supporting forms of the foundation pit, finds that there is a large amount of “free” space in the foundation pit trench for burying pipes or laying civil air channels, and the volume of foundation trench increases several times with the increase of foundation pit depth, which is very suitable for the application of tunnel air technology. Taking a garage tunnel air project in Nanning area as an example, adopts the two-dimensional steady-state heat transfer model established by MATLAB software to simplify the calculation of tunnel wind heat transfer process. The simulation results show that the annual soil temperature fluctuation of the space below 3 m is very small, and with the increase of buried depth, the thermal inertia effect of the soil becomes more and more obvious. The annual highest temperature at the buried depth of 6 m occurs in December, which achieves a good inter-seasonal heat storage. At the same time, with the increase of tunnel length, the cooling capacity of unit tunnel length decreases significantly. From the consideration of economic rationality, suggests that the system pipeline should not exceed 300 m. Finally, by comparing the tunnel air system with the multisplit system, the tunnel air system can save nearly 130 000 kWh of electricity every year, and the static recovery period is about 6.7 years. The energy saving benefit is remarkable in the whole life cycle.

            Keywords:foundationpittrench,tunnelair,mathematicalmodel,garage,energysavinganalysis

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