Audit Example

This is the kind of information that is produced by an energy audit. The actual audit report itself was longer, but the tables have been left out here.

Jonesville United Methodist Church

The Jonesville United Methodist Church in Clifton Park, NY is a 18,870 square feet church built in 1855. Besides the church, it also has a Sanctuary, classrooms, offices, nursery, Fellowship Hall, and food pantry. Multiple additions and remodeling were done in 1987.

The outside walls of the church are pretty common.

All double hung wood framed windows have exterior storms, and the stained glass windows in the sanctuary have exterior Plexiglas storm windows. The Sanctuary roof is insulated with 8″ rolled fiberglass and above the Fellowship Hall ceiling tiles is R-19 fiberglass. The stairwell roof insulation is solid polystyrene.

Heating is provided by three Bryant warm air furnaces, which are two 175,000 BTU/hour units and one 150,000 BTU/hour unit. In addition, two 25,000 BTU/hour gas-fired York units supply heat to the Sanctuary, offices, and nursery, and one ceiling hung natural gas 40,000 BTU/hour unit provides heat to the Food Pantry. Two York HVAC rooftops provide heat for the Fellowship Hall. Cooling for the Fellowship Hall is provided by two 5-ton York HVAC units. Three 12,000 BTU/hour wall air conditioners serve some office areas.

The lighting consists of various incandescent bulbs with compatible older lamps and fixtures. Older technology fluorescent fixtures (T-12 lamps and ballasts) are in the offices, choir room, hallways, six classrooms, north wing and Fellowship Hall. The eight chandeliers in the Sanctuary have 96 60-watt incandescent bulbs. The outside has various incandescent coach lighting fixtures and one 150-watt mercury vapor parking lot light.

Domestic hot water is provided by a 30-gallon 30,000 BTU/hour natural gas fired hot water heater. In addition, a 50-gallon BTU/hour Bradford White heater provides domestic hot water to the kitchen.

The electricity cost for the previous year was $8,062 for 56,520 kWhs, a unit cost of $0.11 per kWh. Annualized natural gas usage was 9,174 therms with an average cost per therm of $0.79, which equals an annual cost of $7,267. Use of this amount of electricity and natural gas result in the emission of 101 tons of carbon dioxide.

Energy audit recommendations:

The recommendations provided by the NYSERDA authorized engineers were:

1) Upgrade T-12 Fluorescent Lighting with New T-8 Lamps and Ballasts

Estimated installation cost:
Annual Energy Cost Savings:
Simple Payback Period:
6.4 years
Electrical Energy Savings:
8,983 kWh/year
Carbon Dioxide Reduction:
7.4 tons

A standard two tube T-12 fixture with two 34-watt tubes consumes about 74 watts an hour. Converting to 1″ diameter T-8 lamps with electronic ballasts reduces the power consumption to 60 watts. Along with the energy savings, light output is actually increased, as well as lamp and ballast life. T-8 fluorescent lighting with electronic ballasts does not flicker. The replacement lighting would consist of 39 two-lamp ballasts and 78 four-lamp ballasts.

(2) Replace Incandescent Lighting with CFLs

Estimated installation cost:
Annual Energy Cost Savings:
Simple Payback Period:
2.5 years
Electrical Energy Savings:
4,981 kWh/year
Carbon Dioxide Reduction:
4.1 tons

Incandescent lighting is the least efficient form of lighting. Compact fluorescent lamps (“CFLs”) cost more but they use only 25%~30% as much energy as incandescent lamps. CFLs also last 5,000 to 12,000 hours, while incandescent lamps typically only last 800 to 2,000 hours. A 15-watt CFL can replace a 60 watt incandescent lamp with equal light. Using warm white lamps will produce light that is more similar to incandescent lamps than cool white lamps. Ninety-nine incandescent bulbs are to be replaced.

(3) Install LED Exit Signs

Estimated installation cost:
Annual Energy Cost Savings:
Simple Payback Period:
3.7 years
Electrical Energy Savings:
5,517 kWh/year
Carbon Dioxide Reduction:
4.5 tons

The 22 existing exit signs are each lit with two incandescent lamps, and usually use about 30 watts each. While the total fixture wattage is not large, they are on 24 hours a day, 7 days a week. In addition, the incandescent lamps burn out often and must be replaced on a regular basis to maintain safety. In comparison, the LED lamps draw only 4 watts each and last 25 years.

(4) Weatherstrip Doors

Estimated installation cost:
Annual Energy Cost Savings:
Simple Payback Period:
3.5 years
Fuel Savings:
14.4 MBTU/year
Carbon Dioxide Reduction:
0.9 ton

Existing exterior doors have gaps along the edges and at the jambs. Weatherstripping is required to eliminate cold air infiltration, which requires the heating and cooling systems to run more to condition the incoming air. The most durable type of weatherstripping should be installed to insure maximum life of up to five years or more.

(5) Insulate Walls

Estimated installation cost:
Annual Energy Cost Savings:
Simple Payback Period:
9.5 years
Fuel Savings:
80 MBTU/year
Carbon Dioxide Reduction:
4.8 tons

The existing walls do not appear to have any insulation. Wood frame walls typically can have R-11 fiberglass or cellulose insulation blow in by machine. Concrete block walls can have loose fill insulation or exterior rigid insulation covered with stucco or another similar finish. The savings and cost estimate is based on insulating 3,000 square feet of wall area. For best results, this project should be designed by an architect or engineering firm.

(6) Improve Air Conditioning EER (Energy Efficiency Rating) by Attrition

Estimated installation cost: $1,700
Annual Energy Cost Savings: $240
Simple Payback Period: 7.1 years
Electrical Energy Savings: 2,178 kWh/year
Carbon Dioxide Reduction: 1.8 tons

The existing split-system and through-wall A/C units have EER ratings of 6.7 to 9.9. However, high efficiency units with EER ratings of 10 and higher are now available. When the existing A/C units require replacement, they should be replaced with these high efficiency units.

(7) Install New Furnaces

Estimated installation cost: $11,200
Annual Energy Cost Savings: $1,733
Simple Payback Period: 6.5 years
Fuel Savings: 219.4 MBTU/year
Carbon Dioxide Reduction: 13.2 tons

The existing furnaces were installed in the 1970’s, and are nearing the end of their useful life. Older style furnaces typically had efficiencies in the 70 to 80 percent range. Replacement with new condensing furnaces that have higher efficiency ratings in the 90’s is recommended. These will both save energy and reduce maintenance costs.

The carbon dioxide information in this summary is calculated from the audit information but is not part of the information reported in the audit.