1. By: Chris Hickey, Ian Antolik, Raimondo DeVincentis

2.  Task Description  Design Approach  Going Green?  Design Matrix  Design Specs  The Hut  Overall Design  Conclusion

3.  Problem ◦ Population of Wiruca, Nicaragua needs a more reliable and efficient cell phone service  Task ◦ Designing a system to power telecom towers in an off-grid application utilizing the GE sodium metal halide battery at a low cost, while minimizing environmental impact.

4.  Disposable income of $10/month/family ◦ Cost efficient service  No Electricity ◦ Need for off-grid power source  Current cell phone tower/system cost: $300,000-$500,000 per tower/equipment and $90,000 for the energy system  1.7 Cordobas/hr for electricity  Mountainous area ◦ Not suitable for wind power  Claro-cell phone service provider

5.  Because of the need for power from and the requirement for an off-grid application, green energy is the best option because of its sustainability and eco-friendliness.  Initial costs of green energy systems are higher, but have a greater return in the time- value of money.

6. Selection Criteria Wind/GeneratorSolar/GeneratorWind/Solar/GeneratorWind/No GeneratorSolar/No GeneratorWind/Solar/No Generator Cost Effectiveness+00+-0 EcoFriendly000+++ Profitable (dump energy)+++0-0 Ease of Use---0+- Sustainability000+++ Practicality-0--+- Solution Pluses 211342 Minuses 212122 Sames 243202 Net 00220 Rank 223112 Continue? yesno yes no

7. Concepts Wind/GeneratorWind/No GeneratorSolar/No Generator Selection CriteriaWeightRatingWeighted ScoreRatingWeighted ScoreRatingWeighted Score Cost Effectiveness0.2551.254130.75 EcoFriendly0.220.45151 Profitable (dump energy)0.0540.250.2530.15 Ease of Use0.1520.330.4550.75 Sustainability0.220.440.84 Practicality0.151 1 50.75 Total Score2.73.654.2 Rank321 Continue?no Develop

8.  9 kW photovoltaic array  33 kWh battery capacity GE Stand-alone Cell Tower Analysisdeveloped by Andy Lau and EDSGN 100.018 PV Array Size9kw Controller efficiency0.97 Turbine Efficiency0.4 from 0.20 to 0.65 Turbine diameter0ft Battery charging efficiency0.97 Generator effiency0.250.20-0.30 Battery Capacity (effective)33kwh Battery discharging efficiency0.92 5.50kwh/m2-day Max1148.032.025.7 Min0.06.00.0 Avg229.117.81.8 637140ManaguaSum (kwh) Turbine output0 kwh PV output18,062 kwh Generator output0 kwh Generator fuel0 gal Generator hours0 hr Dump energy4,463 kwh

9.  Heating and ventilation of hut ◦ q s +q m +q so =q w +q f +q vo -q vi ◦ 90W +750W+134250W=-12416W-934W- 9373606W+X ◦ X=9522046W=9025BTU  Need for a 10000BTU a/c unit  Materials accounted for include: ◦ Studs, drywall, asphalt shingles, metal storm door

10. Cell Phone Tower Solar Panel Hut

11.  Use efficient solar power  Use cheap, but effective building materials  Cost analysis ◦ Solar panels: $27,323 ◦ Light bulbs: $15 ◦ a/c unit: $300 ◦ Batteries: unknown ◦ Building materials: $13,000 ◦ Dump energy sales: $14/year ◦ Equivalent telecom equipment/tower: $300,000- $500,000  Provides cheap, green energy in an off-grid application to the people of Wiruca

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