Tim Kendzia
  • Haddam, CT
  • United States
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Tim Kendzia's Discussions

Cooling effect from solar panels

Started this discussion. Last reply by William Turner Jan 7. 44 Replies

Is there any hard data out there or any personal experience about reduced cooling load as a result of solar panels installed on a south facing roof? So far I have found 1 study showing a 5 degree…Continue

Tags: j, manual, modeling, net-zero, solar

 

Tim Kendzia's Page

Latest Activity

William Turner replied to Tim Kendzia's discussion Cooling effect from solar panels
"fyi, there is moss growing under the bottom edge of the roof under my panels in Maine also."
Jan 7
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"Photocatalytic materials often have titanium oxide or other substances in them as part of the trigger to break down materials when hit with the UV in the sunlight.  Adding to paint - is generally an ineffective ensure the proper application of…"
Jan 2
Craig McManus replied to Tim Kendzia's discussion Cooling effect from solar panels
"I agree. I want to buy the nano material that radiates heat into space and there is a professor who came up with photocatalytic paint that prevents mold and moss on white roofs. I would like a white product that can be painted onto asphalt shingles…"
Jan 2
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"Radiant barriers - especially paints and foils... have been tested many times by various labs and shown to be less than cost effective.  Then simply good old fashion insulation and air sealing. As for new special radiant materials.... indeed…"
Jan 2
Tom Phillips replied to Tim Kendzia's discussion Cooling effect from solar panels
"HI Dennis; good point re: PV benefit of load shifting re: waste heat. I was referring to the whole cooling system, which is removing heat from a building.  If the building shell and cooling system are not very efficient, then PV systems are…"
Jan 2
Craig McManus replied to Tim Kendzia's discussion Cooling effect from solar panels
"We have a radiant barrier that stops roof heat in summer and opens and lets roof heat radiate onto the ceiling and attic ducts on sunny days in winter. Automatically, with no electronics and cheaply. We want to get it made in the USA. It solves this…"
Jan 2
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"I had noted, and show with graphs that there was some cooling because of the shading of panels.  But it was small compared to the reduction as a result of insulation - more insulation and not just code minimum. The original posters was from the…"
Jan 2
Tom Phillips replied to Tim Kendzia's discussion Cooling effect from solar panels
"re: hard data, I recall seeing at least one study that showed some cooling from PV shade on roof.  Suggest you contact David Sailor's groups at AZ State U. re: their  project: Impacts of Photovoltaic panels on urban climates and…"
Jan 2
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"Generally when PV modules are added to a roof, the installers are supposed to ensure that AT LEAST fifteen years remain on the roofs life span (more likely they'd look for 20 years). It would be difficult to do an adequate job that a roofer…"
Jan 1
Craig McManus replied to Tim Kendzia's discussion Cooling effect from solar panels
"In Alabama the duct work is usually in the hot attic. So it is not just the drywall temperature. IMO ducts should only be allowed inside the thermal envelope. When solar pool panels are removed from an asphalt shingle roof the roof looks almost…"
Jan 1
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"PV modules are going to be in full sunlight (if possible),  worrying about the heat on panels is secondary to the good sunlight and secure mounting on the roof.   The original post is now nearly three years ago, at the time he was…"
Jan 1
William Turner replied to Tim Kendzia's discussion Cooling effect from solar panels
"Basic principles to always follow: Keep the solar PV panels as cool as possible.  Insulate the roof as much as possible R 40? or better, with venting above the insulation, not through it,  if at all possible to keep heat in winter and…"
Jan 1
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"The radiation "effectiveness" doesn't change with temp... its the heat flow that changes with the delta-T.    Q = U x A x T   where Q is the heat flow (either direction), U=1/R with R being the insulation R value…"
Dec 28, 2018
Ed Minch replied to Tim Kendzia's discussion Cooling effect from solar panels
"Dennis I get what you are saying, but that makes R-13 batt insulation and an inch of styrofoam thermal bridges also - it's all just a matter of degree.  And room temp is effected by surface temps.  The closer to the interior air temp…"
Dec 28, 2018
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"ALL building materials are thermal bridges which allow for the flow of heat in either direction.  Concrete foundations will act as a thermal bridge and provide a good path for heat loss (or gain) unless the interior floor and space is isolated…"
Dec 28, 2018
Ed Minch replied to Tim Kendzia's discussion Cooling effect from solar panels
"Not sure the drywall being a thermal bridge pertains in this discussion - it is on the inside of a bunch of insulation and serves to add a bit of continuous R-value and provides airtightness.  What are the readings you are getting on the attic…"
Dec 28, 2018

Profile Information

Company
NRG Home Solar
Role in Home Performance Marketplace
Energy auditor / assessor / analyst
Professional Certification
BPI
Professional Interests
Home Energy Efficiency Testing, Data Analysis, Net-zero energy homes
LinkedIn Profile
https://www.linkedin.com/in/tim-kendzia-8a5a6bba

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At 4:46pm on March 22, 2016, Diane Chojnowski said…

Hi Tim,

Welcome to Home Energy Pros. 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!

Don't forget to upload your profile photo.

Thanks!

Diane, HEP Moderator

 
 
 

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