Fan Selections and Their Energy Impacts, Part 2 of 2: Evaluating fans and fan systems and their impact on operating costs

摘要

Fans and fan systems can be significant consumers of energy in commercial applications and the greatest consumer in industrial ones. Concerned about underperformance, designers tend to compensate for uncertainties by adding capacity to fans. Oversizing fan systems creates problems that can increase costs and decrease reliability. This article explains how to evaluate fans and fan systems and their impact on operating costs. It does so by examining the criteria most commonly used in fan selection: 1. Air-stream characteristics. 2. Capacity. 3. Pressure. 4. Power. 5. Efficiency. 6. Fan and system curves. Last month, in Part 1 of this article, we discussed air-stream characteristics, capacity, and pressure. This month, the article concludes with discussion of power, efficiency, and fan and system curves.