August 1, 2011
Features
Low-load delta-T is said1 to exist in nearly every large distributed chilled-water system. The first three articles in this series2,3,4 described strategies for coping with low-load delta-T in plants with primary/secondary (P/S) and primary-only (P-only) distribution pumping. This article will discuss why low-load delta-T is so pervasive in central chiller plants and introduce a means of forcing load delta-T to 10°F....
Optimization of a central chiller plant can achieve and sustain ongoing energy and cost savings...
Constant-volume air-conditioning systems control space air temperature directly and humidity indirectly by modulating or cycling the cooling apparatus. This article examines the effect of economizer operation on the comfort of spaces served by constant-volume air-conditioning systems....
Columns
Smart Grid is an international phenomenon that is mostly about upgrading the energy infrastructure—from how energy is produced, transmitted, and distributed to how it's used. The "smart" part is the use of intelligent devices that allow utilities to manage the grid more efficiently....
Do you enjoy gambling? That's what it is like to buy energy on the open market or flatly accept the cost of energy from suppliers. Toss the dice, or spin the wheel. It's a gamble, and for some firms in today's precarious market, it is no better than entering into a game of roulette. ...
The article "The Quest for Maximum Boiler-System Efficiency" by Senior Editor Ron Rajecki (June 2011, http://bit.ly/Rajecki_0611) is very well-written. When I tried to push the idea of using delta-T in lieu of delta-P ...
Departments
With a $15 million grant from Howard Hughes Medical Institute and a $10 million grant from Massachusetts Life Sciences Center, Marine Biological Laboratory (MBL) is incorporating energy-efficiency and renewable-energy features into Loeb Laboratory, one of 100 buildings MBL occupies in Woods Hole, Mass. ...
Designed and built by ECI, Enerfit is a HVAC-retrofit system that can be applied to any brand of single-zone HVAC system. It varies airflow across a direct-expansion coil without the need for hot-gas bypass, reducing upfront and operating costs....
ASI/Southern Mechanical Inc. introduced to the hospital staff polypropylene-random (PP-R) pipe manufactured by Aquatherm Inc. PP-R pipe, which is electrolysis-resistant, corrosion-proof, chemically inert, and durable, has been used in more than 70 countries for nearly four decades. ...
News & Notes
Senior executives from companies in the HVAC and buildings industries gathered June 10 in Washington, D.C., for the 15th Danfoss EnVisioneering Symposium, "E3: Energy, Efficiency, & Economy."...
LG Electronics USA Inc. recently launched a new Website (www.lg-vrf.com) dedicated to its variable-refrigerant-flow technology....
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