Energy Efficiency experts are always asked to put together indicative projections before embarking on detailed energy analyses. These typical values shown on this post may help you put together a quick analysis for your customers
Note: Do not assume these values to be LAWS. They are only typical values, which SHOULD BE VERIFIED for each application.
| Air Movement | 6 ACH |
| Ventilation Rate | 1 cfm/sf 5 cfm/person |
| Ventilation Rate | 5 CFM/person |
| Fan Energy | 1000-1500 CFM/hp |
| Electric Motors | 0.75 kW/hp |
| Lighting | T12s: 1.2 W/SQFT T8s: 0.8 W/SQFT LEDs: 0.4 W/SQFT LEDs use 50% of CFLs |
| Chiller Size | 300-600 ft2/ton |
| Ton | 12,000 BTU/ton |
| Chilled Water | 2.4 GPM/ton (10° rise) |
| Condenser Water | 3 GPM/ton (10° rise) |
| Chiller Input | Air Cooled Chillers: 1 kW/ton Water Cooled Chillers: 0.6 kW/ton Most Efficient Water Cooled Chillers: 0.35 kW/ton |
| Chillers & Pumps & Towers | .9-1.0 kW/ton |
| Absorbers | 18 lbs steam/ton |
| Boiler Horsepower | 33,479 BTU/hr = 9.8 kW |
| Rebuilt Systems Design | 55°F supply air 30°-40° rise reheat coils |
| Dual Duct & Multizone Design | 55° cold deck 70-105° hot deck – with ODA Reset Schedule |
| VAV | 55°F cooling 10% box leakage flow 40-50% minimum fan volume |
| People Load | 450 BTU/person/hr |
| People Density | Office: 140 ft2/person Theater: 14 ft2/person |
| Heat Transmission | See ASHRAE Handbook of Fundamentals |
| Glass | 1 BTU/ft2/°F |
| Good Wall | 0.1 BTU/ft2/°F |
| Masonry Wall | 0.15-0.3 BTU/ft2/°F |
| Thin Poor Wall | 0.25-0.5 BTU/ft2/°F |
| Overall Building | 0.15-0.5 BTU/ft2/°F |
| Infiltration | 0.5-1.5 ACH without Building Pressurization |
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| Air-cooled (including condenser power > 150 tons) |
EER | COP | kW/ton |
| ASHRAE Standard 90.1 1999 | 9.6 | 2.8 | 1.26 |
| Good | 9.9 | 2.9 | 1.21 |
| Best | 10.6 | 3.1 | 1.13 |
| Water-cooled (>300 ton centrifugal compressor) |
EER | COP | kW/ton |
| ASHRAE Standard 90.1 1999 | 16.7 | 4.9 | 0.72 |
| Good | 18.5 | 5.4 | 0.65 |
| Best | 26.7 | 7.8 | 0.45 |
We borrowed this list from Abraxis Engineering.