Architects & Engineers

Energy Savings

How you can save energy in your heated or air conditioned spaces.




Energy Savings in Heated Spaces

During the heating season, rising heat results in thermal stratification that can make the area near the ceiling quite warm. As a result, the entire space must be overheated in order to maintain comfortable temperatures at floor level. The difference in temperature between the floor and the ceiling can be significant: 0.5°F to 1°F per foot above five feet.

Overheating results in significantly more energy consumption than necessary and usually creates hot and cold spots in a building. The higher the ceiling, the greater the temperature differential between floor and ceiling is likely to be — therefore, the higher the ceiling, the greater the potential for significant savings.


Projected Annual Energy Savings from Destratificaiton

Delta T (in °F)  5.4 7.2 9 10.8 12.6 14.4 16.2 18 19.8
 20 ft. ceiling  12.7  14.7  16.2  17.5  18.7  19.8  21  22  23
 26 ft. ceiling  15.8  17.6  19  20.8  22.1  23.3  24.4  26  27
 33 ft. ceiling  18  20  21.8  23.2  24.8  26.3  27.6  28.8  30.5
 40 ft. ceiling  20  22  23.6  25.6  27  28.4  30  31.8  33.2

Source: Building Scientific Research Information Association, UK, 1997. Computational Fluid Dynamics for a 100′ x 165′ x 26′ building with a 100kW gas heater at 3,600 CFM. Insulation and lighting remain constant.

Under the U.S. Department of Energy, Energy Efficiency & Renewable Energy Industrial Technology Program, the Industrial Assessment Center examined  749 projects designed to “Improve Air Circulation with Destratification Fans/Other Methods.”  The average payback period for these projects is 2.1 years.

Energy Savings in Air Conditioned Spaces

“Thermal stratification causes similar problems during the cooling season.”
Byron Jones, Ph.D., P.E., Assistant Professor, Kansas State University

“Destratification of the occupied zone gives a uniform temperature throughout this area and no areas need to be over-cooled in order to maintain acceptable temperature in other areas.”

ZOO Fans work as Ductless Ducts™ with concentrated columns of air that significantly reduce the need for physical duct work, gently forcing the cool, conditioned air down to the Zone Of Occupancy. The HVAC systems cycle less, the air handlers run less, introduction of outside air can be reduced, and the air keeps moving!

ZOO Fans can save 20% to 30% on space cooling.