ACD-2.2 HTRI Air Cooler Research Plant Effect of Obstructions to Inlet Air Flow
The HTRI air cooler research plant was initially installed in a congested area above a pipeway due to lack of research yard space. The unit included a fan guard and the fan motor was supported by beams across the air intake. Later, the air cooler was located in an open area without a fan guard and the motor support was lowered so as to not obstruct the air intake.
Removal of the fan guard gave a 15 percent improvement in overall efficiency. Reducing the fan tip clearance to zero improved efficiency by 27 percent as shown in Report ACD-2.1. Relocating from the position above the pipeway to an open yard and modifying the motor support added 23 percent to the efficiency.