Table 3 Electric motors retrofitting exercise report for Industry A: (1 kW h = $0.144) for 4800 h of use per year
Existing motors | Replacement | ||||||||
|---|---|---|---|---|---|---|---|---|---|
S/N | Existing motors | Qty | Energy consumption of existing motor (kW h/yr) | Proposed motor for replacing the existing motor | Cost of replacement plus cost of installation ($) | Energy consumption of new motor (kW h/yr) | Energy saved as a result of replacement (kW h/yr) | Cost of energy saved as a result of replacement ($) | Payback period (month) |
1 | Compressor motor 90 kw, 84% eff, 1500 rpm, 380 V | 2 | 771,428.57 | ABB motors (M3BP280) 90 kw, 95.2% eff, 1500 rpm, 380 V | 11,934 + 496 | 680,672.3 | 90,756.30 | 13,068.9 | 23 |
2 | Air compressor motor 75 kw, 90%, 1500 rpm, 380 V | 1 | 300,000.00 | Teco motors (advantage M11 series) 75 kw, 95% eff, 1500 rpm, 380 V | 10212 + 386 | 284,210.5 | 15,789.47 | 2,273.7 | 56 |
3 | E-Motor 7.5 kw, 80%, 1500 pm, 380 V | 12 | 405,000.00 | Baldor UK motors, (EMM3774-65) 90.7%, 7.5 kw, 1500 pm, 380 V | 1842 + 110 | 357,221.6 | 47,778.39 | 6880.09 | 41 |
4 | E-motor 5.5 kw, 82%, 1500 pm, 400 V | 8 | 193,170.73 | Baldor UK (Emm3770-58) 5.5kw, 90.5%, 1500 pm, 400 V | 1060 + 89 | 175,027.6 | 18,143.11 | 2612.61 | 42 |
5 | Pump 11 kw, 86.2%, 3000 rpm, 400 V | 1 | 45,939.68 | WEG motor cast iron top premium 93%, 11 kw, 3000 rpm, 400 V | 1810 + 110 | 42,580.7 | 3359.03 | 483.70 | 48 |
6 | Pump 11 kw, 1500 rpm, 84%, 400 V | 5 | 235,714.29 | WEG motor top premium 92.6%, 11kw, 84%, 400 V. | 1850 + 110 | 213,822.9 | 21,891.39 | 3152.36 | 37 |
7 | Compressor 37 kw, 400 V, 1500 rpm, 84% | 1 | 158,571.43 | 140,358.3 | 18,213.16 | 2622.69 | 24 | ||
Total | 30 | 2109,824.69 | 1,893,893.84 | 215,930.85 | 31,094.0 | ||||