Bradford E. White
  • Newton, Massachusetts
  • United States
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Bradford E. White replied to Daniel Baur-McGuire's discussion How to Insulate Exposed Outdoor Ductwork?? Help
"One system we specify was a contractor suggestion. The "old way" was board insulation and so-forth, pretty common but with a covering of roof membrane to match the roof material. That worked great except it was not a sanctioned application…"
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
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
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
Bradford E. White replied to Luis Hernandez's discussion Water heater ventilation question
"This has been a topic of discussion for 20 years now. It is true that appliance manufacturers often sanction PVC (solid, not cellular core as Charles Buell noted), as venting material. This keeps cost down and market share up and there are thousands…"
Apr 23
Bradford E. White replied to Jerry Needham's discussion HVAC Question about running fan continuously VS setting on Auto so it runs when AC or furnace runs
"Looking at that graph, Allison, the high RH period of five days looks like a vacation period perhaps? With AC setpoint at a higher temperature?My thinking is that, aside from contributed fan heat, running the fan is enthalpy-neutral. There may be a…"
Aug 28, 2018
Bradford E. White replied to Jerry Needham's discussion HVAC Question about running fan continuously Vs. setting on Auto so it runs when AC or Furnace runs
"Agreed! True, if an open plan. Simple is best. But away spaces seem to be making a come-back. And as others noted, return air pathways, let alone directly-ducted return air to each room, is rare indeed."
Aug 20, 2018
Bradford E. White replied to Jerry Needham's discussion HVAC Question about running fan continuously Vs. setting on Auto so it runs when AC or Furnace runs
"Qualified "It Depends" kind of answer. 1. Temperature Perception: There is an intangible comfort advantage to "Fan-On" in that it obviously provides continuous circulation. In a tight, modern house, there is a certain…"
Aug 20, 2018
Bradford E. White replied to Tony Rigdon's discussion Best house measuring tools...
"I am partial to my Leica Disto D330i but also agree with the caveats you state, especially on bright days. Once you get the hang of it, using the area and angle functions, it speeds things up. My principle application is take-offs for blower door…"
Jun 11, 2015
Bradford E. White replied to Elizabeth Guinn's discussion ERV in need of backflow preventer.
"I would use an in-line backdraft damper such as Artis Industries or the ones made by Fantech and other ERV/HRV manufacturers.  The Fantech ones are mildly spring loaded but have a low pressure drop that I have measured at less than 0.04 inches…"
May 21, 2015
Bradford E. White commented on Chris Morin's blog post The #1 Item Missing from High-Efficient HVAC Installations
"Excellent article. We have in our engineering practice a section on protection of electronic devices. While public bid laws rather constrain us, we are partial to Price-Wheeler "Brick Wall" surge suppressors. Very robust and simple units…"
Feb 17, 2015
Bradford E. White replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"One of my several skill sets (I really hate that term, it harkens to nursery school!), is commissioning. By day I am an HVAC design engineer and PM but oversee projects from conception to completion, so it comes with the territory. My side work is…"
Dec 30, 2014
Bradford E. White replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"All good points and refinements, Tedkidd- and by the way, call me Brad. And yes, I am a confirmed wet-head but also a dry-head on commercial/institutional projects more than residential. Anyway, agreed that the business is moving BTUs and not to put…"
Dec 29, 2014
Bradford E. White replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"Agreed, the loss is relatively constant (save for the differences in temperature, narrowing during milder weather and widening with cold, thank you). As you note, improper sizing coupled with poor duct locations are often existing conditions with no…"
Dec 29, 2014
Bradford E. White replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"I see now what you mean. Agreed that installing any ductwork outside the thermal boundary unnecessarily, should be avoided.  But to take this a step further and by the numbers,  code minimum for insulation on ductwork outside the thermal…"
Dec 29, 2014
Bradford E. White replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"I can offer some empirical information, general and highly variable, but borne out with regularity. The "cycles per hour" metric we understand is applicable to on-off equipment of fixed capacity; at best and often rarely it is most closely…"
Dec 28, 2014

Profile Information

Company
Peregrine Energy Solutions
Professional Certification
CEM, CEA, LEED AP (BD+C)
Professional Interests
HVAC design and engineering (my day job). Blower Door Testing, IR Thermography, energy benchmarking, hydronic and radiant system design.

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HIRING TECHNICIANS!

Started by CMC Energy Services in General Forum 3 hours ago. 0 Replies

The problems with gas stoves

Started by Jacob Corvidae in Best Practices. Last reply by Diane Chojnowski on Saturday. 1 Reply

Heat and A/C on a boat

Started by Ed Minch in HVAC. Last reply by John White Jun 4. 3 Replies

Worst boiler ever?

Started by Mark Furst in General Forum. Last reply by Minnie Coleman Jun 3. 6 Replies

Where to spend my marketing dollars?

Started by Trip Smith in Marketing. Last reply by Alan Bine Jun 1. 11 Replies

How to Insulate Exposed Outdoor Ductwork?? Help

Started by Daniel Baur-McGuire in General Forum. Last reply by Ed Fritz May 23. 9 Replies

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