流体机械
流體機械
류체궤계
FLUID MACHINERY
2014年
12期
77-81,38
,共6页
U 型垂直地埋管换热器%性能%影响因素
U 型垂直地埋管換熱器%性能%影響因素
U 형수직지매관환열기%성능%영향인소
vertical ground source U-tube heat exchanger%performance%influence factor
为了了解不同的设计参数对于换热器性能的影响，本文通过建立流体力学三维模型模拟了管长60～200m 的地埋管换热器性能。研究结果显示，流体进口温度、流体速度和初始地下温度都对换热器性能有显著的影响，考虑到热通量和压降2个因素，推荐流速为0．5m／s。回填物和土壤的密度及比热对性能的影响小于导热率的影响。文中开发了一个简单的数学模型用于预测回填物和土壤，比热和导热率以及热通量的影响，预测结果与 CFD 结果高度符合。当换热器的长度从60m 增加到200m，热通量下降，影响半径也变小。
為瞭瞭解不同的設計參數對于換熱器性能的影響，本文通過建立流體力學三維模型模擬瞭管長60～200m 的地埋管換熱器性能。研究結果顯示，流體進口溫度、流體速度和初始地下溫度都對換熱器性能有顯著的影響，攷慮到熱通量和壓降2箇因素，推薦流速為0．5m／s。迴填物和土壤的密度及比熱對性能的影響小于導熱率的影響。文中開髮瞭一箇簡單的數學模型用于預測迴填物和土壤，比熱和導熱率以及熱通量的影響，預測結果與 CFD 結果高度符閤。噹換熱器的長度從60m 增加到200m，熱通量下降，影響半徑也變小。
위료료해불동적설계삼수대우환열기성능적영향，본문통과건립류체역학삼유모형모의료관장60～200m 적지매관환열기성능。연구결과현시，류체진구온도、류체속도화초시지하온도도대환열기성능유현저적영향，고필도열통량화압강2개인소，추천류속위0．5m／s。회전물화토양적밀도급비열대성능적영향소우도열솔적영향。문중개발료일개간단적수학모형용우예측회전물화토양，비열화도열솔이급열통량적영향，예측결과여 CFD 결과고도부합。당환열기적장도종60m 증가도200m，열통량하강，영향반경야변소。
In order to understand the influences of different design parameters on the performance of heat exchanger,a three di-mensional computational fluid dynamics simulation for the performance of ground source heat exchanger with tube length ranging from 60 m to 200 m was performed.The research results show that,the fluid inlet temperature,the fluid velocity and initial ground temperature significantly affect the heat exchanger performance.The recommended fluid velocity is about 0.5 m/s by considering both the heat flux and pressure drop.The influences of density and specific heat of backfill and soil are smaller than that of ther-mal conductivity.The simple mathematic models for predicting the influences of density,specific heat and thermal conductivity of backfill and soil on heat flux are developed,and agree well with the CFD results.With the increase of heat exchanger length from 60 m to 200 m,the heat flux decreases,and the influencing radius decreases.
