Modification of Cabinet Fans with Inlet Air Guide Fairings to Improve Performance.

摘要

Cabinet fans are commonly used for central station air-handlers in commercial size heating, ventilating, and air-conditioning (HVAC) systems. This report describes the conception, construction, and testing of a device to improve the efficiency of cabinet fans by improving the fan inlet conditions. By observing airflow within the cabinet, a region of streamline flow and the boundary of flow separation were outlined. Fan efficiency was improved by enhancing streamline flow and eliminating flow separation within the cabinet by installing a fiberglass fairing which guided the air. A fan was tested with and without the fairing in place; an overall 20 percent improvement in fan efficiency was observed with the fairing in place. (Author)