Comparison and Analysis of Two Expression Methods of Temperature Deviation and Temperature Uniformity
1) Although the temperature uniformity index can indicate the good or poor temperature uniformity of the working space in the box, since the method of multiple averages is used in the calculation, the temperature fluctuation factors of each point are basically removed. . However, it is not enough to indicate the temperature uniformity of the test equipment. It must also have the temperature fluctuation index, that is, the temperature change of each point with time, in order to fully describe the temperature field change in the tank, especially when the temperature fluctuates. Larger case.
2) The temperature deviation not only reflects the position error of the temperature at each point of the working space, but also includes the error of the temperature change of each point with time, that is, the temperature fluctuation degree. Therefore, the temperature deviation can better explain the temperature uniformity in the tank, and generally it is not necessary to measure the temperature uniformity and temperature fluctuation of the test chamber. Temperature fluctuations are indicated only when certain test equipment has special requirements for temperature fluctuations, such as for wet heat boxes. Because the temperature fluctuation of the hot and humid chamber exceeds ±0.5 °C, it will bring about large humidity fluctuations and increase the humidity error, thus exceeding the humidity tolerance.
GB/T5170.2—1996, in the verification method of temperature test equipment, only the temperature deviation is specified for the temperature performance index, but the temperature uniformity is not specified. It must be verified only in Appendix B. The method of verification is very correct.
3) The temperature uniformity index, because it represents the difference between the average value of each point temperature and the average value of the center point temperature, there is a sign, only the temperature uniformity of the national standard, because it is not compared with the center point or compared with the nominal temperature, Therefore, there is no positive or negative sign, so there is no temperature deviation indicating that the method is clear and accurate.
4) At present, some domestic environmental test equipment product standards still require three indicators of temperature fluctuation, temperature uniformity and temperature deviation, which is obviously unnecessary. It is recommended to use the temperature deviation indicator when revising these standards. Zui plus a temperature fluctuation indicator is very comprehensive.
Chocolate Decorating And Spreading
Chocolate Decorating And Spreading,Chocolate Decorating,Chocolate Spreading,Chocolate Garnish
Suzhou Lejoy Machinery Co., Ltd. , https://www.choco-machine.com