Technical

CPVC vs. Stainless Steel Venting Systems

Chlorinated polyvinyl chloride (CPVC) first made its way into the world of venting systems in the residential market. Recently, CPVC has been used to vent Category IV high-efficiency boilers. While it can cost up to 20 percent less than stainless steel, those specifying venting systems should consider other differences that may impact boiler efficiency and present potential safety hazards. 
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Using Thermography to Reduce Residential Energy Use

Thermography uses an infrared camera (thermal imager) to capture two-dimensional representations of the surface temperatures of parts of buildings. Often, those images reveal temperatures or temperature differences that indicate conditions contributing to the waste of heated or cooled air and, as a result, needlessly excessive energy costs.
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Basic Thermodynamics for Refrigeration and Air Conditioning - Part 2

A basic HVAC system shows the application of the Second Law of Thermodynamics. The compressor adds energy to the refrigerant, and it becomes hot, just the way a hand operated tire pump does. Since the compressed refrigerant is hotter than the air blowing across the condenser, the heat will flow to the cooler air. This is a transfer of heat energy out of the refrigerant.
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Achieving Safer, High-Quality Brazing

It is possible to ensure high-quality brazing connections in a safe and environmentally friendly way? Yes it is, with mixed oxyhydrogen gas generators. This technology works only with water and electricity. Gas is generated through a particular electrolytic cell, able to get H2-O2 from the water.
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2015 AHR Expo

Photos from the 2015 AHR Expo at McCormick Place in Chicago.

Posted: February 19, 2015

Podcasts

NEWSMakers: Andy Patron
Andy Patron, partner with FMI Corp., discusses the impact a national labor shortage may have on the mechanical contracting industry. Posted on March 27.
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2015 National Plumbing & HVAC Estimator

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