![]() Keep in mind my humidifier has been on and off to keep it at this humidity. ![]() So to recap, it’s less humid outside in how much total water there is in the air by volume. The absolute humidity outside is 2.77g per meter cubed and a higher relative humidity at 37% relative humidity. at 5.78g per meter cubed the humidity is 35 percent at 66.7 degrees You can see the absolute humidity outside is 2.77g per meter cubed and Inside the absolute humidity is 5.78g per meter cubed, this is despite the fact that the inside RELATIVE humidity is actually LOWER. It’s relative to how much moisture the air actually contains (either inside or outside) relative to how much moisture the air can hold at a given temperature for a given air volume. ![]() It’s not relative between the inside and outside. If you are concerned about overlap then you need to set the hysteresis in both devices automations so it won’t happen.Īnd one more thing is that you might have a misconception about the term “relative humidity”. The best you can do is to see what the actual humidity is right now (yes, relative humidity) and use that to control your humidification/dehumidification devices. And during that time it’s mixing with the air already in your house and being brought to the temperature inside your house so its always continuously changing.īut it will always be at whatever the sensor says it is right now.Īnd if you think you can use a simple equation to try to anticipate what the humidity will do in the future inside your house based on outside conditions then you won’t be happy because there are so many variables - rate of change of outside air temp, outside air humidity, inside air temp, inside humidity, if the air conditioner is running (pulls moisture out of the air), gas stove running (puts moisture into the air), if you are taking a shower, doing dishes, laundry, how sealed your house is so you know what the air exchange rate is (meaning how much is going in vs going out and how fast), etc., etc.,… hopefully you see my point. It takes time for the humid air (either higher or lower) to move into your house. Air is continuously infiltrating into (and out of) your house and as such the humidity outside and humidity inside are constantly in flux trying to reach an equilibrium.īut the humidity inside can’t change instantaneously even if the humidity outside does (which that never does either). If that was the case then you might have a point.īut it doesn’t work like that. Almost like if your house was hermetically sealed like a tuna can and then you suddenly opened said tuna can. You seem to be under the impression that the air outside only moves to the inside in big chunks. You entirely misunderstand what I’m talking about sir and I’m really not sure how else I can explain this. I need to find the relative humidity of the outside when it changes to the indoor temperature to prevent my humidifier and dehumidifier ping ponging on and off repeatedly by using what the actual relative humidity of outside is when it’s at the indoor temperature, which I’m trying to figure out how to calculate. Meaning if I turn on a humidifier and it goes slightly over the max allowed setting I don’t wat the dehumidifier kicking on if it’s not humid outside, which I need to calculate, because if it says it’s 40 percent humidity outside, that’s not the humidity inside. And if outside air is constantly coming in, which it is because my house is not hermetically sealed like a Tuna can, it will constantly drift towards the outside humidity as it really is at the indoor temperature. If the humidity is 40 percent outside and it’s 30 degrees when it moves inside it will be around 20 or 30 percent humidity, even if my indoor humidity is at that moment 45 percent. Not how to guess the outside humidity with the inside humidity, that’s unnecessary. How do I determine the outside humidity when moving to a different temperature is the question. I have the inside and outside temperature, relative humidity, absolute humidity, and dewpoint. Therefore of I want my chinchilla to be not dead I need to make sure that I’m not turning on the dehumidifier if the humidity outside is too low when it changes to a warmer environment and the same is true in the summer when it’s 80 degrees out because the humidity outside at 40 percent when it’s 80 degrees is probably like 60 percent of the total capacity of the air, or 60 percent relative humidity when it comes inside so I need to ensure the humidifier doesn’t erroneously come on. Air at 35 degrees at 40 percent humidity is only like 20 or 30 percent relative humidity at 65 degrees because as air heats up it can absorb more water before condensing. … I have a temperature and humidity sensor both inside and outside… I need to find out what the relative humidity of the air outside is when it enters my house, because it’s a different temperature.
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