Controlling Humidity For All Climates

HVAC School - For Techs, By Techs

Bryan Orr

Education, Business, Self-improvement, Careers

4.9 • 1K Ratings

🗓️ 7 March 2019

⏱️ 40 minutes

🔗️ Recording | iTunes | RSS

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Summary

In today's podcast, Bryan covers some of the facts about humidity. He also explains how to keep humidity under control in all climates. Humidity refers to water vapor in the air and is a component of the air. Changes in temperature and pressure affect the density of the air. The air density determines how much moisture air can hold.

Relative humidity refers to the ratio of water vapor in the air. An RH value of 100% indicates that the air is saturated with water vapor; it has reached the dew point. At that point, the wet-bulb and dry-bulb temperatures will be the same. We do not want to reach the dew point inside a building.

Many people associate high relative humidity with high temperatures, but that association is a misconception. Unless the moisture content is extremely high at high temperatures, the RH will tend to be lower in hotter environments; hotter temperatures can hold more moisture. The moisture content at 90 degrees with 55% RH will be significantly higher than the moisture content at 65 degrees with 55% RH.

If the indoor temperature is below the outdoor dew point, we need to make sure we keep outdoor air out. We can do that by using ventilation strategies like bath fans and kitchen exhaust, especially since construction companies have built homes much more tightly over time. However, we want to ensure that we don't draw in low-quality air from the attic. We find that many humidity control strategies overlap with ventilation.

Bryan also discusses:

Wet-bulb depression
Insulating spaces and the effect on humidity
Dehumidifiers
Attic and crawl space dew points
Humidity drivers inside the home
Coil temperature, airflow, and dehumidification
Off cycle fan delay
Sweating and equipment freeze-ups
Running continuous fan

Learn more about Refrigeration Technologies HERE.

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Transcript

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0:00.0	You're going to do. This episode of the HVAC School Podcast is made possible by our sponsors.
0:20.0	Carrier and Carrier.com, Speed Clean, makers of coil shot and coil jet, innovative solutions for cleaning and tough situations.
0:29.0	Whether you're using coil shot and their tablet cleaners for regular light residential
0:34.0	condenser coil cleaning or if you're using coil jet up on rooftops you're
0:38.0	going to want to take a look at coiljet and coil shot from speedLean at speedlean.com.
0:44.0	Also big thanks to Navac, Navac Global.com.
0:46.6	Navac has been a sponsor for a while and they make some really, really nice vacuum pumps.
0:51.5	They're 12 CFM, large vacuum pump,
0:54.4	DC vacuum pump.
0:55.4	They even make a even bigger one
0:56.8	that has a larger oil capacity for the industrial side.
0:59.3	But we've got that for our commercial refrigeration
1:01.6	division all the way down to their battery power to CFM pump.
1:05.2	You can find it all at navac global.com or by going to truetech tools.com and using the offer code
1:10.3	gets cooled. Also Field Piece, Field Piece is a newer sponsor but they're a company that for We've been using the JobLink probes. Also I want to mention they've got a new manifold
1:25.4	coming out. The S-Man 360 and 460. I got a chance to check them out at HR and there's a lot of
1:31.9	things that are very nice about these new manifolds.
1:34.3	You can tell that they're made to be water resistant, which is very important for a manifold.
1:39.2	And I think it's something to look at and you can find all of their products also by going to true
1:43.7	tech tools true tech tools dot com or it's your local supply house and finally
1:47.9	refrigeration technologies is John and Mike Pasterello, really great guys.
1:53.0	I want to mention Viper Cleaner.
	...

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