Maintenance Technology November 2015 - (Page 37)
In a typical space, physics will stratify
the air, with heat at the ceiling and
cold at the floor, where the people work
(left). High-volume, low-speed fans
break the stratification, improve worker
comfort, and save energy dollars
(right). Illustration courtesy Rite Hite
4 Ways to
Those large, slow-moving ceiling
fans are powerful energy-saving
tools when properly managed.
Make the most of your investment
with these tips.
HIGHVOLUME, LOWSPEED (HVLS) fans
move large volumes of air and generate a steady,
light breeze, creating an evaporative-cooling
effect that reduces a facility's effective temperature by as many as 12 deg. F. The result is greatly
improved worker comfort and productivity.
These units are also energy savers in that the
floor-to-ceiling air movement they create helps
improve air-conditioning system efficiency.
In fact, an HVLS fan can make it possible to
increase the air-conditioning thermostat setting
by 5 deg. F with no change in employee comfort.
While the warm-weather benefits of HVLS
fans are commonly understood, smart facility
managers realize that operating them during
the summer is just the tip of the energy-savings
iceberg. Here are four tips for maximizing ROI
on a year-round basis.
To learn more visit ritehite.com
Run HVLS fans during the winter.
During winter, many plants often have more than a 20-deg.-F difference
between the floor and ceiling. Typically, the air temperature will be 0.5 to 1
deg.-F warmer for every foot in height. As such, a heating system must work
hard for extended periods to maintain the temperature near the floor, or at
the thermostat set point, wasting precious energy and dollars. Operating
HVLS fans during winter months can reduce energy consumption by as
much as 30%.
Put the right fan in the right place.
Several factors must be considered when deciding how and when to use
HVLS fans. They include obstructions such as pallet racks, machinery
and product staging, personnel work areas, and overall building layout.
Larger-diameter fans (24 ft. dia.) will move air further down rack aisles
and over obstructions. Small-diameter fans (8-, 10- and 12-ft.) are most
effective in specific work areas. In recent years, floor-mounted HVLS fans
also have become available where overhead obstructions preclude the use of
traditional ceiling-mounted HVLS fans.
Use centralized controls.
While advanced HVLS fans can cover an area as large as 22,000 sq. ft., in
some facilities that isn't enough. In those instances, a fan array driven by a
centralized-control system is required. Programmable systems can manage
as many as 18 HVLS fans, and allow personnel to:
■ control fan operation based on facility temperature
■ schedule fans to operate only when needed
■ view individual fan settings (on/off and speed)
■ monitor energy use and troubleshoot various VFD (variable-frequency
drive) fault codes
■ use an optional Modbus port for easy network connection.
Many control systems can also be integrated with building-management
systems, making it possible to coordinate fan operation with other building
Segment space with fabric curtain walls.
Small spaces take less energy to heat or cool than large spaces. Unfortunately, industrial facilities tend to encompass large, wide-open areas.
Therefore, flexible fabric curtain walls can be an important supplement to
HVLS fans. As an economical way to partition space, these curtain walls can
maximize the effectiveness of a facility's entire HVAC/HVLS environmentcontrol system by segmenting off areas that require extensively treated air,
further minimizing waste. MT
MAINTENANCETECHNOLOGY.COM | 37
Table of Contents for the Digital Edition of Maintenance Technology November 2015
For on the Floor
Tiered Empowerment Drives PEX Reliability
Consider the Common-Cause Method
Think Like A Hacker
Take a "CSI" Approach to Asset Management
Maximize HVLS Fan ROI
Keep Your Planners Focused
Extend Chain Life
Scan Energy Wasters
Maintenance Technology November 2015