Technical

HVAC Air Leakage Inspections

Conventional wisdom would have you concentrate thermal imaging on windows and doors. However, windows and doors contribute very little to total air leakage in most dwellings. In fact, the most serious leaks occur at the top and bottom of the conditioned building envelope - in attics and basements.
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Explaining V-Belt Drive Misalignment

V-belt drive misalignment exists when the driver and driven sheaves are not properly aligned. Misalignment can take either the form of angular or parallel (offset) misalignment, or a combination of both. Ideally, you want to have both parallel and angular harmony.
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Emerging Technology: Chilled Beam Cooling

Chilled beam systems provide savings by replacing fan energy with pump energy. They use pumped chilled water instead of blowing cold air. Water has much higher heat capacity, both by mass and volume. In typical pump and fan arrangements, this has been shown to translate into a reduction in fan energy by a factor of seven.
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Demand-Controlled Ventilation in Multi-Story, Multi-Residential Buildings

This article, reprinted from an EXHAUSTO white paper, discusses the benefits of demand-controlled ventilation (DCV) systems in multi-story, multi-residential buildings, which include improving building energy efficiency, enhancing comfort and other key performance factors. It reviews the application of DCV in new, retrofit and renovated building projects.
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Explaining Static vs. Dynamic Sheave Balancing

If a sheave is not balanced, it will have an inherent uneven distribution of weight. This uneven weight distribution magnifies vibration and noise when rotated and as speed of rotation increases. Unbalanced sheaves can also lead to premature life of other drive components due to the vibration and stresses placed on the components.
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Resources for Making Energy Audits Feasible

Facility managers are hunting for ways to operate more efficiently and conserve energy. We know more now than we did even a few years ago about where to look for unnecessary waste. We also know how to quantify the dollar value of that opportunity. That allows you to create a more accurate proposal that’s more likely to be approved and achieved.
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W.J. O'Neil Saves Energy at Landmark Detroit Building

John Guardiola, vice president of engineering at Portfolio Property Management Global (PPMG), knew exactly who to call to help him update the building systems at the downtown Detroit landmark, One Detroit Center: Joe Colleran and his team at mechanical service contractor W.J. O’Neil Company.
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NREL Evaluates Fuel Cell Technologies in Early Market Applications

Last April, the U.S. Department of Energy (DOE) announced a substantial investment of $114.3 million in funding for the rapid deployment of approximately 1,000 fuel cell systems in key early markets including combined heat and power (CHP). A team from the National Renewable Energy Laboratory (NREL) is now assessing these systems.
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2015 HARDI Fly-In

Highlights from HARDI's Congressional Fly-In in Washington, D.C. Post date: May 28, 2015.

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NEWSMakers: Kevin Conrad
Kevin Conrad, president, Kevin Conrad Heating and Cooling Inc., Nantucket, Massachusetts, breaks down working in the New England climate, the benefits of insulation foam, and more.


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2015 June 29

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2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

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