"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…"
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Joel Greenberg
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Joel Greenberg's Discussions
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.
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Latest Activity
Rob Orchard 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…"
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…"
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. …"
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…"
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…"
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…"
Joel Greenberg posted a discussionHelp 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
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."
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…"
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."
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…"
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.…"
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…"
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?"
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…"
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One thing I don't want to see is more…"
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