Abstract:

Preliminary experiments were carried out to study a non-intrusive method for measuring water flow rate based upon temperature cross-correlation. Through monitoring two temperature points in an insulated pipe, the data were analyzed with cross-correlation algorithm using Matlab software, and the delay time between the two points was estimated, thus the flow velocity and rate were obtained. The results showed that the estimated flow rate could agree with the measured value within an error of 10% if the minimum of the sum of square of the temperature differences was adopted as the optimization target. If combined with wireless temperature sensor network, the application of flow rate measurement based upon temperature cross-correlation may be anticipated in HVAC engineering.

Key words: measurement, algorithm, experimental validation, flow rate, cross-correlation method, temperature

摘要：

对基于温度互相关法的非侵入式水流量测量方法进行了初步的实验研究。将保温管路中两点温度作为直接被测信号,利用互相关法进行数据分析,用Matlab求出信号相位差,即延迟时间,进而得到流速和流量。结果表明:两测点温度差的平方和最小作为两者相似的判断条件,能够使估算出的流量与流量计实测流量差别在10%以内。结合无线温度采集网络技术,基于温度互相关法的流量测量在暖通空调工程中的应用值得关注。

关键词: 测量, 算法, 实验验证, 流量, 互相关法, 温度