基于非接触式热交换器能效评价检测技术的温度数值模拟分析

ANSYS of Energy Efficiency Evaluation and Testing Technology of Non-contacted Heat Exchanger-Temperature Numerical Simulation Analysis

为解决在役热交换器能效评价过程中流体介质温度无法测量的难题,本文利用数值模拟技术,模拟45#钢测试段壁厚δ为5、10、15、20 mm 4个壁厚条件下,25~65℃温度范围内测试段外壁温度与流体介质温度之间的函数关系。采用Pt100铂热电阻贴壁式温度传感器,与直接接触法对同一台板式热交换器同时测量,进行热工性能分析,发现在热流体定性温度为60℃、冷流体定性温度为30℃,冷热流体流速均为0.5 m/s的标准工况下,贴壁式温度传感器测量法与直接接触测量法误差在1.0%范围内。

In order to solve the problem that the temperature cannot be measured during the energy efficiency evaluation of the in-service heat exchanger,this paper proposes to use PT100 platinum thermistor wall mounted temperature sensor to measure the outer wall temperature of the test section,establish a one-dimensional steady heat transfer model for the energy efficiency test of the heat exchanger using numerical simulation software,and establish the functional relationship between the outer wall temperature of the test section,the medium temperature in the test section,and the thickness of the test section.Two temperature measurement methods were used to analyze the thermal performance of the plate heat exchanger,and it was found that the error between the wall mounted temperature sensor measurement method and the direct contact measurement method was within 1.0%under the standard working condition that the qualitative temperature of the hot fluid was 60℃,the qualitative temperature of the cold fluid was 30℃,and the flow rate of the cold and hot fluid was 0.5 m/s.