地埋管換熱器熱響應(yīng)測(cè)試與模擬研究

摘要：【中文摘要】 對(duì)48m深雙U型地埋管進(jìn)行熱響應(yīng)測(cè)試,并使用線熱源模型對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行分析。計(jì)算得到該測(cè)試地點(diǎn)土壤導(dǎo)熱系數(shù)為1.44W/(m.K),進(jìn)水溫度為37℃時(shí),每米井深散熱量為91.14W/m。在實(shí)驗(yàn)的基礎(chǔ)上,建立地埋管全尺寸換熱模型,該模型水流進(jìn)口條件與實(shí)驗(yàn)一致,土壤導(dǎo)熱系數(shù)、地下初始溫度等均為實(shí)驗(yàn)測(cè)得數(shù)據(jù)。以換熱量比較,模擬結(jié)果與實(shí)驗(yàn)結(jié)果相差6.8%。在驗(yàn)證模型精度的基礎(chǔ)上,對(duì)50m、60m、70m埋深的單U及雙U型換熱器進(jìn)行模擬比較。進(jìn)水溫度為36.85℃時(shí),對(duì)于單U型管,單位井深換熱量分別為59.19W/m、56.23W/m、53.40W/m;對(duì)于雙U型管,單位井深換熱量分別為94.16W/m、90.00W/m、85.93W/m。不同深度的地埋管,雙U型換熱性能優(yōu)于單U型,散熱量約高37%,但是單U型管出水溫度低于雙U型管。 【英文摘要】 A thermal response test has been carried on double-U tube ground heat exchanger,and Line-Source Model was used for data analysis.As shown in this result,soil thermal conductivity of the place where the test carried out is 1.44 W/(m·K) and when the temperature of inlet water is 37℃,heat dissipating capacity per unit depth of borehole is 91.14 W/m.Based on the test result,full-size model of borehole heat exchanger has been established.All the parameters of the model were set the same value as the test or its result,such as the state of inlet water,soil thermal conductivity,undisturbed initial ground temperature.Compared simulation result with the test result,the error is 6.8%.As the error is acceptable,further researches have been made on different kinds of borehole heat exchangers and the depth are 50 m,60 m,70 m.The results show that the heat dissipating capacity per unit depth of borehole is 59.19 W/m,56.23 W/m,53.40 W/m with single-U tube ground heat exchanger and 94.16 W/m,90.00 W/m 【中文關(guān)鍵詞】 地埋管換熱器; 熱響應(yīng)測(cè)試; 傳熱模型; 數(shù)值模擬【英文關(guān)鍵詞】 ground heat exchanger; thermal response test; heat transfer model; numerical simulation