Many building operators do not repair or replace VFDs when they fail since motors can easily keep running through a bypass contactor. Continued operation in this mode quickly becomes a very expensive way to operate a fan.
Here is a quick reference on heat transfer. The equations are designed for quick and easy application in the field. They're intended for the technician who needs to determine if a system or component is performing in the desired range of operation.
The benefits of blower door testing are multifold, and the contractors that have adopted its use are employing it in a variety of creative, valuable ways to strengthen the bottom line and improve quality of service to their customers.
Today, fuel cells are being developed to power commercial buildings, homes, passenger vehicles, and even small devices such as laptop computers. This article describes basic fuel cell components, highlights current fuel cell types, and discusses the technology challenges.
The adage "garbage in equals garbage out" holds especially true when determining chiller performance. If your sensors haven't been calibrated in the last year and are over three years old, the odds of them being inaccurate are almost 100 percent.
This article has been excerpted from a comprehensive white paper, "Refrigerants for Commercial Refrigeration Applications," issued by Copeland Corp., part of Emerson Climate Technologies. The article focuses on the criteria for refrigerant selection, including discussion of the transitional refrigerants (HCFCs), chlorine-free refrigerants (HFCs), and halogen-free refrigerants.
Ladders are such common everyday tools that many workers take them for granted. The two principal causes of ladder-related injuries are using the wrong ladder for the job and misusing or abusing climbing equipment.
A properly functioning air filter system provides cleaner and safer air to building occupants. It also makes the HVAC system operate more efficiently and extends equipment life. This article provides details on air filter systems.
Thermal energy storage is an energy conservation tool as well as an environmentally friendly and economically attractive alternative to new electric generation capacity. The installation highlighted in this article provides more information about its benefits.