Danny Gough
  • Lewisville, NC
  • United States
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REALLY????

Started this discussion. Last reply by Danny Gough May 18. 12 Replies

I am working my way through ACCA's latest manual LLH (Low Load Homes). The postulate of continuous fan increases indoor humidity in the cooling season arises in Section 8. This principle has been…Continue

Tags: Elevated, Humidity, Blower, Continuous, Bailes

 

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Danny Gough replied to Danny Gough's discussion REALLY????
"As I have read through everyone's excelent responses, it has caused me to reassess my assumptions. Tim O'Brien made a observation that is rightly relevant when he provided, "I believe most A/C system evaporators running at part load…"
May 18
Tim O'Brien replied to Danny Gough's discussion REALLY????
"Bradford - I have seen single family homes with ducted central AC or heat pump hold enough water upon shutdown that the living space relative humidity increased >10% when the fan was left on. I'm sure there is some diversity among the…"
May 17
Bradford E. White replied to Danny Gough's discussion REALLY????
"That is why I like VRF systems, David.  We agree especially in the humid south and of course with cycling in general of on-off single-capacity systems. Inverter drives are the current ideal and I use them whenever I can on larger systems (which…"
May 16
David Butler replied to Danny Gough's discussion REALLY????
"Bradford wrote: >I do not see that amount of moisture on that size of coil as a problem, let alone a 3 SF residential coil with limited outside air. Probably not. But to Danny's point, a lot of folks in residential building science &…"
May 16
Bradford E. White replied to Danny Gough's discussion REALLY????
"Got it and understood thank you. I was figuring if there was a problem, the water was not leaving the unit. That amount of moisture though is negligible though, at least in large, high-latent air handling units. For example, a 10,000 cfm 100% OA air…"
May 16
Tim O'Brien replied to Danny Gough's discussion REALLY????
"Danny - you are correct. An evaporator with no airflow over it will dry out slowly. Keeping the airmover on and some air velocity over the evaporator increases the liquid water evaporation rate exponentially. The inside of the evaporator plenum…"
May 16
David Butler replied to Danny Gough's discussion REALLY????
"@Bradford, Danny is referring to residual moisture that remains adhered to the coil after the compressor cycles off. Due to adhesion, a meaningful amount of bulk water will remain on the coil rather than dripping off into the catch pan. Eventually,…"
May 16
Bradford E. White replied to Danny Gough's discussion REALLY????
"All cooling coils which remove moisture (which is most of them!) require a drain pan below them to capture this. So much is known and ideally this would be either stainless steel or an approved thermoplastic or ABS for corrosion protection. The…"
May 16
Danny Gough replied to Danny Gough's discussion REALLY????
"Since I always spec a whole house dehumidifier, it doesn’t cause me to loose any sleep."
May 12
David Butler replied to Danny Gough's discussion REALLY????
"Depending on loads and how the stat is managed, there's usually one extended off-cycle per day, long enough for coil to fully dry. But if you still want continuous blower (for other reasons), at least employ an air handler, stat, or 3rd party…"
May 12
Danny Gough replied to Danny Gough's discussion REALLY????
"David,  My reference was that the coil needs to dry at least some time within a 24 hr period to reduce the risk of microbial growth and the creation of bio film. "
May 12
David Butler replied to Danny Gough's discussion REALLY????
"Although I haven't personally measured coil moisture, it stands to reason that what you describe in your last paragraph may not be a small impact. Having looked at a lot of AC cycle graphs over the years, I would posit that the "off…"
May 12
Danny Gough posted a discussion

REALLY????

I am working my way through ACCA's latest manual LLH (Low Load Homes). The postulate of continuous fan increases indoor humidity in the cooling season arises in Section 8. This principle has been shouted from the roof tops of many building science venues for years. And up until this point, I have embraced that Kool-Aid with the masses. The subject matter is discussed in an Allison Bailes article found here from 2012.   …See More
May 12

Profile Information

Company
Energy Solutions, Inc.
Role in Home Performance Marketplace
Building energy modeler, Educator / Trainer, Energy auditor / assessor / analyst, Engineer
Professional Certification
BPI, HERS Rater, RESNET
Website URL
http://energysolutionsnc.com
Facebook Page
https://www.facebook.com/Energy-Solutions-Inc-337120958023/

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At 5:29pm on February 21, 2018, Diane Chojnowski said…

Hi Danny,

Welcome to Home Energy Pros Forum. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos, and upcoming events. If you're blogging about home performance, this is the place for you!

Thanks!

Diane, HEP Forum Moderator

 
 
 

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