Cambridge Space Heaters
Operating Costs
Based on 2,490 Heating Degree Days at 65°
$0.018/ft2 Gas cost @ $0.50/therm
$0.026/ft2 Electric cost @ $0.08/Kwh
$0.04/ft2 Total cost
Building Specifications
- R-2.7 Roof / R-1.5 Walls
- 604,800 ft2 x 35’ high
- Located in McKinney, TX
Heating System
- (8) Cambridge Space Heaters
- Roof top mounting
- 16,717 MBH total (28 Btu/ft2)
- 112,000 CFM total (.185 CFM/ft2)
- 120 HP total (.2 HP/Kft2 - intermittent)
Make-Up Air
Operating Costs
Based on 2,407 Heating Degree Days at 65°
$0.031/ft2 Gas cost @ $0.50/therm
$0.054/ft2 Electric cost @ $0.08/Kwh
$0.09/ft2 Total cost
Building Specifications
- R-11 Roof / R-1.5 Walls
- 425,000 ft2 x 35’ high
- Located in Dallas, TX
Heating System
- (6) Draw Thru Make-up Air Heaters
- Roof top mounting
- 9,798 MBH total (23 Btu/ft2)
- 81,900 CFM total (.193 CFM/ft2)
- 75 HP total (.18 HP/Kft2 - continuous)
Summary
The Cambridge system used 48% less total energy. If the 425,000 ft2 facility had installed a Cambridge system they could have saved approximately $21,000/year operating at $0.04/ft2 vs. $0.09/ft2.