![]() ![]() So I don't know excel formulas very well (which is a reason I joined this site) and I'm not super with math. Once you find a source that you like for that information, the Excel programming side of the problem should be straightforward. I apologize that I cannot be more specific, but it seems that the big roadblock at this point is getting the necessary table or chart that will allow you to enter wet/dry bulb temperatures and back out relative humidity. If you need help putting together a 2D lookup formula, let us know, because we have several examples across this site and can readily help with the lookup step if you can come up with the lookup table that you want to use for this. Excel's lookup functions could easily be used on a table like that shown in the engineering toolbox site, if you can get a table like that specific to your location/altitude/whatever. ![]() From what I can see, the basic programming procedure would be:ġ) Enter dry and wet bulb and barometric pressure (if you decide it is necessary).Ģ) From dry and wet bulb, search your psychrometric chart/table using that information to get relative humidity. Other sites I read suggested that psychrometric charts/tables would be pressure specific (your file does not include a barometric pressure anywhere), so this particular chart/table may not be useful. I found this page ( ) that includes a chart and table. Your sample file does not include any of that necessary information. PT.How much of your question is specific to Excel, and how much is a more general psychrometry (did I get that right?) question? We are usually good at programming stuff in the spreadsheet if the user can explain the necessary math, engineering, scientific, or other background information needed to do the programming, but we are not always knowledgeable in those areas to come up with the necessary algorithms.Īssuming "humidity" means relative humidity, most descriptions of how to calculate relative humidity from wet/dry bulb temperatures involve a psychrometric chart. From washability testers, appearance meters and coating thickness gauges – through to automatic film applicators and bresle patches. ![]() The TQC Sheen name has been recognized as a leader in innovative paint test equipment since 1947. We can help you to understand anything you need to know about your paints and surface coatings. And also always keeping the customers wishes in the first place! As part of Industrial Physics – a global packaging, product, and material test and inspection partner – we’re able to protect the integrity of manufacturers, production lines, and laboratories across a multitude of industries all over the world. High quality products are supplied and maintained by our efficient organisation following well-structured procedures. We decided to have our organisation certified according the ISO 9001 standards by “Det Norske Veritas”. In our brand line of business where quality is the keyword for our customers. All products are designed to meet the highest quality standards. Including a range of wash ability testers, appearance meters, coating thickness gauges, automatic film applicators and bresle patches. TQC Sheen offers a wide variety of products. Our brand is known for innovative paint test equipment.
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