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Case Study Report

Location: Missouri

Application Type: Warehouse

Design: On the south side (354,000 square feet), two 17,000 CFM RAM22 units with on-off thermostats were installed with a discharge temperature set for 140 degrees F. On the north side (285,000 square feet), two 17,000 CFM RAM22M recirculating Total Heat Systems units were installed, each including continuous space temperature and static pressure control.


Facility Details:

  1. 637,650 square feet
  2. 40 foot ceilings
  3. North/South split

Results:

 
Description and
Location
Gas Meter
Readings
Motor Hour
Readings
Gas Cost
($0.90/Therm)
Electricity Cost
($.08/KW-Hr)
 
Northeast (Recirc)
707900 ft3
2382 hours
$ 6,373
$ 1,421
 
Northwest (Recirc)
764300 ft3
2202 hours
$ 6,881
$ 1,315
 
Southeast (Cycling)
1752200 ft3
1392 hours
$ 15,773
$ 832
 
Southwest (Cycling)
946300 ft3
682 hours
$ 8,519
$ 407

Conclusions:

Cost:

  1. Total Heat System Annual Energy Cost: $15,990 ($.056/square foot)
  2. Cycling System Annual Energy Cost: $25,531 ($.072/square foot)
  3. Total Heat System Savings: $.014/square foot
  4. Potential $5000 annual savings by installing the Total Heat System on the south side

Pressurization:

  1. North side (Total Heat System) – Comfortable, consistent temperatures throughout warehouse
  2. South side (Cycling System) –Strong, cold drafts near dock doors

Recommendation:

  1. Utilize Total Heat System on both sides of the warehouse for maximum comfort and energy savings