光纤光栅温度传感器在地源热泵中应用
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摘要
地源热泵应用地下土壤的地热资源,为建筑冬季供暖和夏季制冷.为了实时监测地源热泵工作过程中垂直盘管换热器周围土壤温度的变化,应用3个自行研制的光纤光栅温度传感器,组成分布式光纤光栅温度监测系统对其进行监测.3个光纤光栅温度传感器分别安置在25 m垂直盘管的5、15和25 m处.垂直盘管安装完后,应用FBG波长解调系统采集数据.采用双层钢管封装的光纤光栅温度传感器,有效消除了应变对光纤光栅的影响,同时也提高了光纤光栅的温度灵敏度.该光纤光栅温度传感系统对地源热泵长期工作状态进行了监测,监测结果与理论计算结果符合很好.
Ground-source heat pump system utilizes the thermal energy of the underground soil to heat or cool a building.The monitoring of the on-line temperature distribution of the soil and the thermal difference of the circulating water system are discussed by an optical fiber Bragg grating(FBG) sensor system.Three Bragg grating sensors were placed at intervals of 10 m in a deep well with a length of 25 m.Data were collected immediately after the installation of the water pipes using a commercial FBG interrogation system.The sensors with double-steel tube were designed and packaged delicately to eliminate the influence of strain as well as to improve the thermal sensitivity.This FBG sensor system can monitor temperature fluctuation of ground-source heat pump for a long period,and the monitored results accord well with theoretical ones.
Ground-source heat pump system utilizes the thermal energy of the underground soil to heat or cool a building.The monitoring of the on-line temperature distribution of the soil and the thermal difference of the circulating water system are discussed by an optical fiber Bragg grating(FBG) sensor system.Three Bragg grating sensors were placed at intervals of 10 m in a deep well with a length of 25 m.Data were collected immediately after the installation of the water pipes using a commercial FBG interrogation system.The sensors with double-steel tube were designed and packaged delicately to eliminate the influence of strain as well as to improve the thermal sensitivity.This FBG sensor system can monitor temperature fluctuation of ground-source heat pump for a long period,and the monitored results accord well with theoretical ones.
引文
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[2]颜爱斌.地源热泵应用的技术分析与思考[J].天津城市建设学院学报,2002(2):120-122
[3]丁力行,陈季芬,彭梦珑.土壤源热泵垂直单埋管换热性能影响因素研究[J].流体机械,2002,30(3):47-49
[4]李林凡,仇中柱,于立强.垂直埋管式土壤源热泵埋管周围土壤温度场的数值模拟[J].建筑热能通风空调,2000(4):1-4
[5]高青,于鸣,乔广,等.地热利用中的温度可恢复特性及其传热的增强[J].吉林大学学报,2004,34(1):107-111
[6]森村正直,山崎弘郎.传感器技术[M].北京:科学出版社,1988
[7]涂亚庆,刘兴长.光纤智能结构[M].重庆:重庆出版社,2000
[8]李宏男,李东升,赵柏东.光纤健康监测方法在土木工程中的研究与应用前景[J].地震工程与工程振动,2002,22(6):76-83
[9]李宏男,李东升.土木工程结构安全性评估、健康监测及诊断述评[J].地震工程与工程振动,2002,22(3):82-90
[10]REN L iang,L I Hong-nan,SUN L i,et a l.FBGsensors for on-line tem perature m easurem en ts[J].P roc SP IE In t Soc O p t Eng,2004,5391:94-99
[11]徐秋敏.U形垂直埋管式地源热泵地下传热特性的实验研究[D].大连:大连理工大学,2005
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