August 2014 Blog Posts (14)

Top 5 Changes to ACCA Manual S

      As I had brought up years ago, ACCA's Manual S was in dire need of an update.  Written in 1995, Manual S Residential Equipment Selection was passed by with huge technical and efficiency strides within the…

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Added by Christopher Morin on August 27, 2014 at 5:30pm — 1 Comment

After 70 years on the fence, knotty LED light fixtures hide the Ductless in splendor

After the first week, the ductless heat pump and I became so close that could never even think of her as ugly. But some folks don't like the look.

In an analogy to current medical practice, the mini-split heat pump is fabulous but the side effects are minimal for some people. In those cases, we have a cure for the side effect, the LED sandwich light that mesmerizes the eyes softly and makes heat ugly pumps disappear right before your very eyes.…

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Added by Joseph Lamy on August 19, 2014 at 4:09pm — No Comments

UPDATED: Big Changes for Duct Testing in MA

   If you have not been asked to complete a duct test by your local Massachusetts Inspector, it is just a matter of time before you are surprised by this stringent/updated code requirement.  Despite some push-back from Contractors  and Inspectors, all of MA is required to test new or altered duct systems.  All of MA adopted the 2012 International Energy…

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Added by Christopher Morin on August 17, 2014 at 4:59pm — 9 Comments

Assessing long-term PV performance in a low-energy home

Zero Energy Home Friends,

My daily PV output from a 6.56 kW PV system has averaged 22.7 kWh/day over the last two years.

kWh= AC kWh from inverter to grid

irrday= cumulative kWh/m2/day plane of array

pvptmp= array temperature (F) taken on back on one of the modules

obs= elapsed…

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Added by Danny S. Parker on August 17, 2014 at 12:55am — No Comments

Jeremy Draper & the Craiglist Adventure

RaterFest! has many traditions... Bon-fires, Rater Jams, Rater Olympics, Colorado Craft Beers...

Perhaps one of the less well known, but dearly loved, is the tradition of Raters sharing stories about their own homes.

This year we are excited to have Jeremy Draper, who will tell his unique story of building his first home using as much recycled or re-used materials as possible.  He is nothing short of a Craiglist master.…

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Added by Hannah Finch on August 13, 2014 at 12:00pm — No Comments

No Bubbles, No Troubles!

Or is there? This saying is an old adage in our industry to let the technician know that the refirgerant charge is "all set". You see, there must be a steady stream of liquid to the metering device for it to function properly. For sake of conversation, let's use the TXV. In order for most TXV's to throttle and correctly maintain the desired Superheat, there must be a minimum of 2F of subcooled liquid at the valve (not where it is measured, near the condenser). If the liquid were to flash off… Continue

Added by Christopher Morin on August 12, 2014 at 1:19pm — No Comments

Casa Automatica - Aiming for Zero consumption in acclimatization

Hi there, I'm new here. Not sure if this make sense here. But for sure, you will tell if it's not. 

I'm Portuguese, I've 47 years old, 3 children, and spent the last 3,5 years of my life on a project I've called Casa Automatica.

The project started by being just an home control system, where I've tried to combined some security features, water control and home network, in a package, using and sharing an internet connection. The system is presented here…

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Added by jose caramelo on August 11, 2014 at 3:30pm — 7 Comments

FALL FAST TRACK to Revolutionize Home Performance Business, Rock the Houses on Sept 1 2014

You took a class, or read a book, got BPI or HERS Rater certified, or just bought some diagnostic equipment. Your company was heading in the right direction in the beginning, but NOW WHAT? Earning certifications and owning diagnostic tools is a step in the right direction, but it’s only a step… the real power of your home performance focus is in practicing what you preach with testing on every job, and using it to…

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Added by Corbett Lunsford on August 9, 2014 at 11:01am — No Comments

The One Month Countdown to RaterFest! has Begun!

RaterFest! (September 5-7) is less than one month…
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Added by Hannah Finch on August 8, 2014 at 2:30pm — No Comments

Announcing BPI Infiltration and Duct Leakage Certification

On August 4th, the Building Performance Institute (BPI) announced a new certification focused specifically on blower door and duct blaster concepts. The announcement came during a monthly meeting for approved BPI Test Centers. The official announcement is slated to come soon. BPI Infiltration and Duct Leakage, or BPI IDL for short, will be a standalone certification that emphasizes proper handling of energy auditing equipment - and you heard it here…

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Added by Everblue on August 7, 2014 at 7:00am — No Comments

Help Wanted in Park Ridge, IL

General Labor/Painting/Building Maintenance Position. Some construction knowledge is preferred. Priority Energy is a leading energy solutions companies. 1.800.737.2299

Added by Robert Schildgen on August 6, 2014 at 2:04pm — No Comments

Learning Applied Building Science is Still Hard to Do

As part of Home Energy’s 30th birthday celebration, we are pleased to reprint a 1994 article by Michael Uniacke describing the way he taught building science in a community college (see the article here). Mastering the intricacies of the building science related to energy performance is no…

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Added by Home Energy Magazine on August 6, 2014 at 8:40am — 4 Comments

Stump Duncan, Innovate with Colby, and Save on RaterFest! 2014

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Added by Hannah Finch on August 2, 2014 at 9:00am — No Comments

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Eric Kjelshus commented on Jeremy Begley's blog post The Home Envelope : Does it Really Matter in a Heat Loss Caculation
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