Retrofitting

There are many instances when fluid streams, such as the outside-air and exhaust ducts, are not contiguous, so a conventional heat-recovery unit cannot be used. In such cases, where several thousand cubic feet per minute […]

The power factor (pf) of an electrical service is the ratio of actual power use to apparent power. A circuit with predominantly lights has a pf of close to unity, while a circuit with many […]

It’s a common misconception that lighter building construction is better, in the sense of using lightweight concrete for floors, aluminum studs for walls, and intricate schemes to minimize the steel stock used. Structurally, this approach […]

It’s a foregone conclusion that the size of someone’s office is a symbol. It’s also a given that a larger office requires more energy for lighting, and this lighting puts a higher load on the […]

This section offers some general criteria for the selection of supply-air diffusers. One application has a ceiling diffuser supplied from a branch duct by a short segment of flex duct. The best designs incorporate a […]