Bradford E. White
  • Newton, Massachusetts
  • United States
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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
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
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
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
Bradford E. White replied to Kevin Wood's discussion HRV or ERV
"Totally. Can't add to that."
Dec 24, 2012
Bradford E. White replied to Kevin Wood's discussion HRV or ERV
"I agree with Kevin regarding the need for mechanical ventilation vs. relying on passive, uncontrolled ventilation though places you do not ask about in polite company. That aside, Venmar, Lifebreath, Fantech are, depending on model, fairly…"
Dec 24, 2012
Bradford E. White replied to Don Hynek's discussion Anybody know what this is??
"Looks to me like the top of a steam relief vent used to terminate the top of the vent pipe from a boiler feed unit receiver or pressure relief valve. The top was designed with a drain you can see on the side, this kept it clear of ice. The bulb top…"
Dec 7, 2012
Bradford E. White replied to Andrew Vidal's discussion looking for a good load calculation software. in the group HVAC
"I am partial to the Elite software line. I use their CHVAC for my commercial and institutional work but have not used their RHVAC residential/Manual J based product. The interface takes getting used to, not as "clean" as the types that…"
Feb 14, 2012
Bradford E. White joined Allison A. Bailes III's group
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HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
Feb 14, 2012

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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David Butler replied to Brett Little's discussion Do ductless systems do better on the HERS?
"Hi Sean, my comment re: actionable cooling load was about the application of ductless, not related…"
Friday
Sean Lintow Sr replied to Brett Little's discussion Do ductless systems do better on the HERS?
"Assuming same efficiency - apples to apples - off the top of my head the only way a ducted system…"
Friday
David Butler replied to Brett Little's discussion Do ductless systems do better on the HERS?
"By 'actionable', I mean the load is such that the homeowner actually needs to use A/C, as…"
Friday
Paul Zabriskie is now a member of Home Energy Pros Forum
Thursday
Brett Little replied to Brett Little's discussion Do ductless systems do better on the HERS?
"When you say actionable cooling loads you mean higher than heating loads?  I need to see…"
Thursday
David Butler replied to Brett Little's discussion Do ductless systems do better on the HERS?
"Since the Home Performance Forum archives are hosted on a different server with different software,…"
Thursday
tedkidd replied to Gordon Smith's discussion Duct Cleaning? Good value or a waste of money?
"Why are they calling? Get 4 or 5 why's. Are supplies dirty?! Why!! In most cases, changing…"
Thursday

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