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Cooling-tower fan The Whisper Quiet Fan for Baltimore Air Coil’s PT2 cooling tower provides 12- to 15-dBA sound reduction, has Cooling Technology Institute-certified thermal capacity, and is compliant with ANSI/ASHRAE/IESNA Standard 90.1. The ......More

Boilers for large-volume applications XP boilers and automatic circulating water heaters are designed for large-volume commercial applications. These high-efficiency condensing boilers offer outputs ranging from 920,000 to 3.4 million Btuh. They are ......More

The Southeast Alaska Discovery Center in Ketchikan, which provides information to more than a million visitors each year, is the site of a pilot biomass boiler system now coming to life. Two oil-fired boilers serving the 250,000-sq-ft center were replaced with a highly efficient system fueled by local wood....More

Boilers experience cyclic stresses every time a burner starts and stops. Those stresses occur because the boiler structure resists the expansion and contraction that otherwise would occur from temperature change. The higher the firing rate, the greater the stress....More

A condition that exists in a tall building when outside temperature is significantly lower than the temperature of the spaces in the building is called stack effect. Stack effect is the phenomenon in which a tall building acts as a chimney in cold weather, with the natural convection of air entering at the lower floors of the building, flowing through the building, and exiting from the upper floors....More

District energy facilities allow thermal and electric utilities to be generated efficiently and reliably. These systems also allow for the consolidation of maintenance and operations. These reasons alone have justified the significant capital investment required. Today, however, there is a new movement that is changing how these investments are viewed: the sustainable building movement....More

An alternative to conventional variable-air-volume (VAV) systems, chilled beams circulate chilled water through tubing embedded in a metal ceiling fixture to wick away heat. The business end of a chilled beam is made of copper tubing bonded to aluminum fins. The beam is housed in a sheet-metal enclosure typically placed at ceiling level...More

Maintaining an optimized boiler system extends the life of equipment and significantly reduces facility operating costs. In many cases, the path to an optimized boiler system begins with an energy assessment....More

End users of solar thermal systems expect a measurable and significant return on their investment. To provide the most accurate system-performance numbers and meet customers’ expectations, it is necessary to model these systems with software that can produce reports validating system design and performance. In this article, we are going to look at the information needed for the design of a forced-circulation solar thermal system and then extract from the reports information the simulation produces....More

With the current strong emphasis on energy conservation, there is a great deal of interest not only in selecting the most energy-efficient products, but properly applying them to obtain the greatest energy savings. Multiple-boiler systems are very helpful in achieving this goal....More

When it comes to maximizing the efficiency of a boiler system, the Holy Grail is precisely matching the output of the system to the load in the building. Fortunately, new technologies and new ways of controlling water flow through the system are making this goal more achievable than ever before....More

This article will focus on boiler hydronic heating systems. There are many different types of hydronic systems; however, they all are made up of the same basic components, such as pumps, coils, control valves, and boilers. This article will discuss how boiler turndown can improve the interactions among many of these components to create a more stable and reliable heating system....More