Development of a low-profile acoustical door for use on racks and cabinets for the Information Technology industry

摘要

This paper presents the design of a 19 inch rack acoustical door. The design balances acoustical attenuation, airflow impedance and distribution in a short depth by combining air foil technology with acoustic baffle design. Design optimization was done utilizing fluid flow analytical modeling and verified with an air flow bench and an acoustical rack door test fixture. Higher heat loads in rack mounted computer equipment drive higher cooling requirements. In order to provide air cooling solutions, higher volumetric air flow is required resulting in increased acoustical noise. This noise can result in levels that are unacceptable to the customer. Acoustical doors lower noise levels but are prone to high flow impedance, uneven flow distribution and large physical depth. Increased impedances require higher air moving device speeds to offset the lost volumetric air flow. This decreases the effective acoustical attenuation. Various rack modules have different inlet and outlet air flow locations making the distribution of the air from the door (front) or into the door (rear) important. Solutions to these problems usually require large depths in order to provide blockage of line of site and gradual air flow lines to keep impedance low and provide even distribution of the air.