![]() Let ea = actual water vapor pressure, es = saturated water vapor pressure, RH = relative humidity, T = temperature, and Td = dewpoint temperature, then This dewpoint is another way to describe the actual water vapor pressure. If unsaturated air is cooled, at some temperature, it will become saturated and dew will form. Saturated vapor pressure is the maximum that can exist at a given temperature excess will condense out as dew or frost. Relative humidity is a ratio of actual water vapor pressure to saturated water vapor pressure. Most of this is pretty straightforward with the exception of what equation to use for saturated water vapor pressure. That will be a good day to use the evaporative cooler.īut if the morning readins are 90° F and 25% RH, I might as well use the air conditioner all day.Ĭan any of you out there in Internet Land point me to such a graph?įor anyone looking for a chart for humidity problems, Google "psychrometric chart." There are free ones out there, I recommend the Carrier chart if you can find it.įor those who want formulas for programs, I will try. As the outside heats up, the outside temperature may rise to 95° F and (I'm guessing) 7% RH. Let's say, our "Weather Station" shows the morning temperature as 90° F and 10% relative humidity. ![]() If the absolulte humidity is too high, I know that I will have to give up and use the regular air conditioner at some time during the day. However, we have had an extended monsoon season this year. I open the door between the garage and the kitchen and let the cool, humid air sweep through the house. ![]() I have an evaporative cooler (otherwise known as a "swamp cooler") in the garage. I am in Henderson, Nevada, on the South side of Las Vegas, about 700 feet above the "Strip". Then follow the absolute line to another temerature and read *that* relative humidity. Then go to the temperature and relative humidity on the graph. With it, one could check for relative humidity on a meter. In many years past, I've had such a graph. • General question: any question that is not technicalĪfter your question is answered, please change the flair to "Resolved".Re: Relative Humidity <> Absolute Humidity(*) At mods' discretion, certain self-promotion submissions from people who contribute to this sub in other ways may be allowed and tagged with the "Self-promo" flairĬomplete rules: /r/embedded/about/rules/ Link flairsĪfter posting a submission, please select a flair: No memes (pictures with superimposed text), shit posts.No spam no commercial posts, links to commercial pages (including crowd funding sites), no employment ads (job offers and requests go to the weekly thread), no self-promotion (*).If asking a question, ask the actual question, fully yet concisely, right in the title.Be civil: do not insult no all-caps, no excessive "!" and "?", please.Questions on employment (career, internship), education (major, certificates), how to start in embedded.Job announcements (outside the monthly job thread).High level software (e.g., C#, Javascript): r/softwaredevelopment, r/software.Single Board computers: r/Raspberry_pi, r/Arduino, r/linux_devices, r/linuxboards.Hardware design that does not include a micro for electronic circuits: /r/AskElectronics.Homework help but make it clear it's homework.This sub is dedicated to discussion and questions about embedded systems: "a controller programmed and controlled by a real-time operating system (RTOS) with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints." FAQ
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