I recently helped someone calculate relative humidity!

I found the original poster’s post quite interesting; I’ve been working on temperature and humidity calculations lately as well. Calculating relative humidity from dry-bulb and wet-bulb temperatures is indeed a classic problem. I tried the link provided by the original poster, and it’s quite convenient – you just need to enter the data and the results are generated automatically, which is very useful for those who don’t want to write the formulas themselves. However, I would like to remind that in actual engineering or meteorological applications, different formulas may be used depending on the scenario (for example, there are those based on the Goff-Gratch formula as well as the Magnus approximation). When performing calculations, it’s best to confirm the applicable scenario with the relevant party to avoid discrepancies in results due to differences in coefficients. Additionally, it would be even more reassuring if the original poster could also indicate the reference standards used for the calculations (such as GB/T or ASHRAE). Thank you for sharing the tool link; I’ve saved it~

I’m posting this mainly to help everyone understand wet-bulb temperature! Many people don’t know where to start when faced with this question, so I specifically created diagrams to help everyone understand it! I really hope that no matter what they do, people can learn by analogy and not always think about taking things from others. http://www.fishsting.com/xxjh/soft/sqwdjs.asp

Given the dry-bulb temperature and wet-bulb temperature, the relative humidity can be determined; this is clearly specified in the standard GB/T7190.2-2018 Mechanical Ventilated Cooling Towers – Part 2: Standards for Large Open Cooling Towers

Do you always go to check the specifications?

GB/T7190.2-2018 Mechanical ventilation cooling towers – Part 2: Standards for large open-type cooling towers, clause A 6.4.1 provides a very clear formula

There’s no need to check all the specifications; as you do more work, you’ll become more proficient. You can turn it into a calculation sheet and simply input the data to carry out the calculations. The most important thing is to know how to calculate it, understand the principle behind the formula, and be able to explain it to others. Otherwise, everyone would calculate it by entering it into a spreadsheet using formulas.

I solved it with just one function! Don’t want this table! Calculate relative humidity (dry bulb temperature, wet bulb temperature)