Joel Greenberg
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  • Austin, TX
  • United States
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Help Me Program Open Source Energy Software
1 Reply

Austin, TX will be hosting a 48 hr "Code-a-thon"April 14-15, 2012.  The goal is to jumpstart development for non-profits. I have started two projects: 1)…Continue

Started this discussion. Last reply by Evan Mills Feb 2, 2012.

 

Joel Greenberg's Page

Latest Activity

Rob Orchard replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"We've done audits and upfits to several thousands homes in South Carolina over the past four years. Our customers are interested in lower power bills and are generally on a limited budget. The cost vs. benefit of insulation, air sealing, duct…"
Dec 18, 2012
Don Hynek replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"DOE models lots of weatherization measures (for financial cost-benefit analysis) at 20 years life ONLY because of the peculiar mathematics of calculating Savings-to-Investment Ratios and discount factors. When you use a 3% discount…"
Jun 4, 2012
Joel Greenberg replied to Caroline Hawkins's discussion Equipment Reviews: Blower Doors and IR Cameras
"You can't go wrong with either the TEC or Retrotec blower door or duct testers/blasters.  I teach using both brands, but I find the TEC DG-700 slightly more intuitive for new users because of the layout of the input and reference taps on…"
Feb 28, 2012
Joel Greenberg replied to Bud Poll's discussion The science of hot air rising
"What's  you're thoughts on buoyancy and thermals?  Is it the same as stack effect, even though stack effects exists in a bounded area? I can see how could, denser air pouring into a building, or a valley, displaces hot air. …"
Feb 11, 2012
Joel Greenberg replied to Bruce Navin's discussion LED's interfering with Garage Door Openers
"There's a technique for driving LEDs called pulse width modulation (PWM).  It turns them on and off more than 15 times a second.  Doing so saves electricity because you're only lighting the LED for half the time.  It works…"
Feb 8, 2012
Joel Greenberg replied to Bud Poll's discussion The science of hot air rising
"Seems to me language is getting in the way.  Hot air is more buoyant than cold air because the warmer air molecules are more energetic than the colder ones and therefore take up more volume for the same mass as cold air.  The hot air…"
Feb 8, 2012
Evan Mills replied to Joel Greenberg's discussion Help Me Progam Open Source Energy Software
"Perhaps good news for you, NEAT is actually currently being rebuilt as a web application. This was announced at the National Weatherization Training Conference last December. Another possible useful resource for you is that the Home Energy Saver…"
Feb 2, 2012
Joel Greenberg posted a discussion

Help Me Progam Open Source Energy Software

Austin, TX will be hosting a 48 hr "Code-a-thon"April 14-15, 2012.  The goal is to jumpstart development for non-profits. I have started two projects: 1) Rewriting NEAT as an open source framework that can be used as the basis for open source energy auditing and modeling tools. 2) Improving on the open source Open Energy Monitorto include web reporting functionality, among other…See More
Feb 1, 2012
Bob Mariani replied to Joel Greenberg's discussion One room's hot, one rooms cold. Where to investigate? in the group Best Practices (Residential)
"The wisps you see in this image indicate air leakage causing room to be cold.  The tthermal bridging would not flare out like this."
Dec 22, 2011
Avery Ray Colter replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"That is a loaded question, and depends a lot on the window to wall ratio of your windows. I just was in a webinar today which spoke of dense-packed insulation, the fact that many older homes have wall cavities which are open into the attic, etc. I…"
Nov 14, 2011
Timothy DeLuca replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"I have seen the same results in my NEAT/MHEA experiments. In our area double panes will never come up cost effective under any conditions if both panes are intact."
Oct 31, 2011
Joel Greenberg replied to Matthew Redmond's discussion NABCEP Installer trianing development questions in the group Renewable Energy
"I'm a BPI BA and I teach both weatherization and solar at Austin Community College.  ACC developed a curriculum based upon the NABCEP learning objectives for the Entry Level Exam and we use Jim Dunlop's textbook.     When…"
Aug 26, 2011
tedkidd replied to Joel Greenberg's discussion One room's hot, one rooms cold. Where to investigate? in the group Best Practices (Residential)
"If the envelope is tight it may be an equipment oversize issue.  I always ask if equipment ever runs continuously.   Like many building science truth's that are intuitively backwards, undersizing equipment is better than oversizing.…"
Jun 30, 2011
John M replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"Window salespeople have 'see and feel' going for them: See- new windows look much nicer than an airsealed attic and basement Feel - customers will feel less intense convective loops and radiant losses replacing a R-1 single pane…"
Jun 2, 2011
t hardy replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"Surely not true.  The bigger spacing allows for more convection and convective losses between the two surfaces. No?"
May 27, 2011
t hardy replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"I certainly agree with most of the posts in reply, with one additional thought. Determine the cause of the reasoning.  I have found in some cases that the homeowner is really talking about one or two specific rooms and has then made the mental…"
May 26, 2011

Profile Information

Company
Greenberg Energy Services, LLC
Professional Certification
BPI Building Analyst
Professional Interests
Energy Efficiency
Energy Writing
Energy Podcasting (www.tech2energy.com)
Website URL
http://www.greenbergenergyervices.com
Twitter ID
greenbergenergy
LinkedIn Profile
http://www.linkedin.com/in/joelgreenberg

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Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
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tedkidd commented on Diane Chojnowski's group Hall of Shame
"Give this thread a bump - here's my "bad" album and some of the…"
17 hours ago
Eric Kjelshus commented on Adam Swain's blog post Top Worst Crawl Space Insulation Ideas
"6) Radiant barrier- under the gravel is just a barrier but with holes each square inch its not a…"
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tedkidd replied to Luis Hernandez's discussion Distribution Efficiency and heating safety factor in TREAT in the group TREAT Software
"It is very common to find equipment grossly oversized. I mean 1.5 - 2x Manual J and 2-3x the size…"
17 hours ago
tedkidd replied to Luis Hernandez's discussion Basic Heat loss information in the group TREAT Software
"Luis,  Click "selected reports, energy savings and use, design heating and cooling…"
17 hours ago

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