Technical

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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Towards Improving the Design of Cast Iron Components for Refrigeration Equipment - Part 1

There is a large body of publications regarding uses of cast iron. But very few of them are concerned with the use of cast iron in refrigeration equipment, and even less with the behavior of such materials at low temperatures.


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NREL Works with ASHRAE, Others to Cut Building Energy Use in Half

Hospitals use a lot of energy to save lives. To find ways to cut the energy intensity of large hospitals as well as schools and retail buildings by half, DOE’s Commercial Buildings Program and its National Renewable Energy Laboratory (NREL) are working together with ASHRAE and other members of the building industry.


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Is It Better to Test Ducts with a Positive or Negative Pressure?

A very common complaint about duct testing is that the covers get blown off the registers. Most code language leaves the choice of pressurizing or depressurizing up to the tester, but experience has shown that the positive pressure made sealing registers much more difficult, and could triple the time to perform a test.


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What’s Shakin’ with Your HVAC System?

Using a vibration tester can enable technicians with no training in vibration measurement and analysis to test pumps, motors, compressors, and other HVAC equipment and get both diagnoses and recommendations for required action on the spot within just a few minutes.


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Food Wholesaler Sees Big Savings, Quick ROI with WiFi-Enabled Thermostats

Through the installation of ecobee EMS thermostats in the massive warehouse and office campus of food wholesaler SUPERVALU® in January 2012, the company was able to slash energy usage and realize a return on investment within one week of installing the thermostats.


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Legionella, HACCP, and ASHRAE’s Pending Standard 188

If properly followed, American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 188 stands to affect the way water systems are managed in hundreds of thousands of buildings in the United States.


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Air Infiltration Testing: Five Reasons Why You Should Do It

Energy codes are emerging or being updated nationwide. As air leakage testing becomes a requirement, some testers wonder what value it adds over informed visual inspections. Here are five reasons why blower door and duct leakage testing actually saves auditors’ and homeowners’ time and money.


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Evaporative Condensing Energy Efficiency

Due to escalating energy costs over the past several years, supermarket chains are exploring new equipment designs to reduce their energy consumption. This article provides a detailed comparison of a typical supermarket refrigeration system designed with air-cooled condensers versus one with evaporative condensing.


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NEWSMakers: Cynthia Hutson

Cynthia Hutson, chairperson of ACCA of Central Ohio, talks about the organization’s Heat the Town events, the importance of carbon monoxide checks, and what is coming up for ACCA. Posted on Nov. 21.

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