Featured Blog Posts – August 2014 Archive (6)

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 8:30pm — 1 Comment

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 7:59pm — 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 3:55am — 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 4:19pm — 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 6:30pm — 7 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 11:40am — 4 Comments

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