Humidity Talk w/ Johnathan Jones

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 1 May 2018

⏱️ 53 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In today's podcast episode, Johnathan Jones from Clean Comfort, Ultra-Aire, and Therma-Stor talks to us about humidity, dehumidification, and ventilation.

Relative humidity (RH) is a moisture content ratio that depends on temperature. Hotter air can hold more moisture, and colder air can contain less moisture. You can increase or decrease the temperature to change the relative humidity, but the dew point stays the same. The safest humidity range is between 40-60%. It is typically harder to add humidity to an arid place than to remove humidity from a tropical place.

We work to control the dew point (keeping it below 55 degrees). When we keep our indoor temperatures well above the dew point, we don't have to deal with condensation and moisture, which leads to microbial growth. We encounter two conflicting schools of thought: reduce the fan speed to control humidity or raise the fan speed to keep the ducts warm enough to prevent "growth." However, a dedicated dehumidifier takes care of the space without requiring fan speed changes.

A lot of indoor moisture comes from our bodies, such as by breathing and talking. Local ventilation, especially during cooking and showering, helps reduce moisture ONLY if it sucks in quality outdoor air. Ventilation strategies can be balanced or imbalanced. Balanced ventilation helps us avoid negative ventilation; mechanical ventilation brings the building under positive pressure. When a building is under positive pressure, air gets pushed out to maintain balance. Additionally, pollutants tend to stay out. However, positive pressure can cause condensation to occur in colder climates and works best alongside a dehumidifier.

We also discuss:

Moisture units (pints, pounds, grains)
Infiltration
Encapsulated attics
ERVs in coastal states
Ventilating dehumidifier setup
Comfort differences based on humidity alone
Latent and sensible capacity
Hot gas reheat applications
Dehumidifiers and energy efficiency

Check out Clean Comfort HERE, and check out Therma-Stor HERE.

If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.

Check out Refrigeration Technologies HERE.

Transcript

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0:00.0	This episode of the HVAC School Podcast is made possible by our partners,
0:18.9	Carrier, Mitsubishi Comfort, the new UEEI Hub wireless probes, refrigeration technologies, makers of
0:27.8	nylon and Viper Cleaning products and a lot of other great products for the HVAC industry, and Air Oasis.
0:35.0	Oasis.
0:36.0	makers of high quality USA-Made Air Purification products.
0:40.6	You can find out more about all of our sponsors who make this podcast and everything else we do possible by going to HVACR School
0:47.0	and looking on our partners tab.
0:50.0	Meet Zoomlock, the 10 second flame-free refrigerant fitting from Parker.
0:53.9	Reduce labor costs by 60% with no braising, no flame, and no fire spotter.
0:59.0	Discover how Zoomlock can help you be more efficient and productive.
1:02.6	Visit zoomlock.com for more information.
1:05.6	Every man hits a certain stage in life, a stage where they become more serious.
1:16.0	This guy blew right past that stage straight to old man dad humor.
1:21.0	Brian Orr.
1:22.0	Yeah, I've always sort of skipped through stages in life and I was a, I was really a kid until about
1:31.0	14 and I started working and pursuing my interests in life, adult interests.
1:37.0	And then I started Kailos in my business when I was in my early 20s,
1:42.0	and now I'm already just straight to like my
1:44.8	70s and my humor is there I enjoy a delicious glass of prune juice okay it's not
1:51.7	not quite to that extent yet.
1:53.0	Anyway, thanks for listening.
1:54.0	This is the HVAC school podcast, the podcast that helps remind you of some things that you might have forgotten
	...

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