Retrotec USACE - Manual (Page 97)

Energy Assessment Procedure 75
TABLE 2. CAUSES OF ENERGY WASTE AND INEFFICIENCY IN HVAC SYSTEMS.
Problem description Waste/ineffi ciency Reference/appendix
Ventilation Use of excessive dampers to achieve air balance Waste D2.1.1
Loose fan belts in ventilation systems Ineffi ciency D2.1.2
Ventilation equipment operating when not needed Waste D2.1.3
Use of conditioned air for hood make-up air Waste D2.1.4
Air movement greater than 0.51 m/sec (100 fpm)
near exhaust hoods Waste D2.1.5
Hot air warmer than 93.3 °C (200 °F) being exhaust-
ed outside in ventilation systems Waste D2.1.6.
Process ventilation systems that operate continu-
ously with the process turned off. Waste D2.1.7
Central exhaust ventilation system connected to multi-
ple hoods operate at a constant airfl ow with a diverse
manufacturing process: contaminant emission occurs
at less than 75% working places simultaneously Waste D2.1.8
Use of motors more than 2.271 kW (3 hp) that are
less than 85% effi cient in ventilation systems Ineffi ciency D2.1.9
Use of dilution ventilation in processes that could
use a hood to capture the contaminants Ineffi ciency D2.1.10
Use of canopy hoods to control process emissions Ineffi ciency D2.1.11
Using single side exhaust hood on plating tanks 4 ft
wide or wider Ineffi ciency D7.2.4
Poor exhaust hood design for catering facilities re-
sults in heat, grease, and smoke/vapor spillage or in
increased exhaust and makeup airfl ow rates. Ineffi ciency D7.10.9
Turning (lathe), drilling, milling and grinding machines
do not have local exhausts or process enclosures Ineffi ciency D7.3.1
Using continuous operating welding exhaust Waste D7.2.1
Using stationary welding hoods Ineffi ciency D7.4.2
Running foundry exhaust systems when not required Waste D7.7.1
Poor exhaust hood design results in heat, grease,
and smoke/vapor spillage or in increased exhaust
and make-up airfl ow rates. Ineffi ciency D7.10.9
Single island canopy hood over kitchen equipment Ineffi ciency D7.10.10
Supply air jet disturbs airfl ow around the kitchen
hood results in heat, grease, and smoke/vapor spillage Ineffi ciency D7.10.11
Ineffi cient positioning of appliances at the wall re-
sults in heat, grease, and smoke/vapor spillage or
increase exhaust and make-up airfl ow rates Ineffi ciency D7.10.12
Separate ventilation systems for a dining room and a
kitchen. ineffi ciency D 7.10.15