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Technical

Energy Efficiency, Geothermal Heat Pumps, and ‘Negawatts’

The Lowest Cost Unit of Energy Is One That Is Not Used
A recent study by Ceres — “Practicing Risk-Aware Electricity Regulation: What Every State Regulator Needs to Know” — concluded that the least cost and least risk for future energy resources is energy efficiency. Indeed, the lowest cost unit of energy is one that is not used.


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The Need for Bearing Protection for Inverter-Duty Motors

All major manufacturers of three-phase ac induction motors offer “inverter-duty” or “inverter-ready” models, but while these motors have inverter-rated insulation to protect the windings, the bearings — their most vulnerable parts — are too often ignored. 


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Consultant Offers Top 10 Green Building Trends for 2013

Leading green building and sustainability consultant Jerry Yudelson has released his annual list of “Top 10 Megatrends” for the green building industry. Yudelson said, “It looks like a good year ahead for the green building industry.”


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Increasing the Lifespan and Reliability of Electrical Components

Heat is both a byproduct and one of the greatest enemies of electrical and electronic components. If not dissipated, this heat has the potential to cause early failures and malfunctions.


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Contractor Boosts Revenue with Mobile Work Order Management

Hank’s Plumbing of Calgary, Alberta, Canada, replaced paper forms with mobile software from Flowfinity Wireless Inc., Vancouver, British Columbia, on its field technicians’ smartphones to gain significantly improved management of time and materials.


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Smudging Around Air Distribution Diffusers

The problem of dirt collecting around ceiling diffusers has been a concern in the air distribution industry for a long time. Some people have asked about this dirt and the impact on indoor air quality (IAQ).


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NREL’s Energy-Saving DEVAP Air Conditioner Cuts Peak Power Loads

The desiccant-enhanced evaporative (DEVAP) air conditioner — developed by the National Renewable Energy Laboratory (NREL), AIL Research, and Synapse Product Development LLC — combines desiccant-based dehumidification with indirect evaporative cooling to reduce cooling energy use by as much as 81 percent.


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Towards Improving the Design of Cast Iron Components for Refrigeration Equipment - Part 3

The first two parts of this series dealt with the use of cast iron components in refrigeration equipment. This last part will focus on the construction of such components.


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Towards Improving the Design of Cast Iron Components for Refrigeration Equipment - Part 2

In the first part of this three-part series, we talked about the effect cold shortness has on the use of cast iron in refrigeration equipment. Now we will look at porosity and abrasion resistance.


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Reduced Refrigerant Dehumidifiers Can Separate Contractors and Engineers from the Competition

Reducing refrigerant in direct expansion (DX) HVAC system designs is a trend both contractors and consulting engineers are using to distance themselves from the competition. While refrigerant reduction has been fairly common in conventional air conditioning, it’s only now emerging in the category of indoor pool (natatorium) dehumidification.


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2014 SMACNA Annual Convention

Views from the 2014 SMACNA Annual Convention in San Antonio.

Podcasts

NEWSMakers: Chris Mathis

Chris Mathis, president of Mathis Consulting Co. and vice chair of ASHRAE’s residential ad hoc committee, talks about ASHRAE’s exploration into the residential market. Posted on Oct. 17.

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EFFICIENCY STANDARDS

DOE has denied AHRI’s petition for reconsideration of walk-in standards. Is it getting harder to reach consensus on efficiency standards?
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