7 A Multifamily Residential Building Is Considering A Lighting Retrofit And A Heating System Overhaul The Lighting Pro 1 (66.97 KiB) Viewed 33 times
7 A Multifamily Residential Building Is Considering A Lighting Retrofit And A Heating System Overhaul The Lighting Pro 2 (63.27 KiB) Viewed 33 times
7. A multifamily residential building is considering a lighting retrofit and a heating system overhaul. The lighting project includes LED upgrades with occupancy sensors, will cost $25,000 in capital expense and reduce operating costs by $10,000 per year by dint of lower maintenance requirements. The heating system overhaul will cost $1,500,000 in capital expense and will require an additional $25,000 per year (i.e., in addition to whatever the building spends now) in on-site maintenance to ensure efficient operation. The changes in operating costs described above do not include the change in energy use and costs. Current and projected energy use are provided below:
Proposed Annual Energy Use Total Total Natural Fuel Energy Use Energy Oil Steam Use Electricity (MMTBU) (kWh) Gas (Therm) (gal) (Mlbs) (MMTBU) Space Heating 3,618 24,396 388 2,494 Domestic Hot Water 182 1,819 182 Cooling 30,825 105 30,825 105 Ventilation 46,371 158 46,371 158 Lighting 332,329 1,134 197,635 675 Process Loads Elevators 125,223 427 125,223 427 Plug Loads and Misc 57,026 195 57,026 195 Cooking 526 53 526 53 7a, b: Determine the SIR and IRR of the projects for a holding period of 15 years and an interest rate of 5%. (6 points each). (a holding period is the time between the acquisition of an asset and its sale). Electricity (kWh) Existing Annual Energy Use Natural Fuel Gas Oil Steam (Therm) (gal) (Mlbs) 35,393 563 1,819
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