By: Chris Hickey, Ian Antolik, Raimondo DeVincentis

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

 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.

 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

 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.

Selection Criteria Wind/GeneratorSolar/GeneratorWind/Solar/GeneratorWind/No GeneratorSolar/No GeneratorWind/Solar/No Generator Cost Effectiveness EcoFriendly Profitable (dump energy) Ease of Use Sustainability Practicality Solution Pluses Minuses Sames Net Rank Continue? yesno yes no

Concepts Wind/GeneratorWind/No GeneratorSolar/No Generator Selection CriteriaWeightRatingWeighted ScoreRatingWeighted ScoreRatingWeighted Score Cost Effectiveness EcoFriendly Profitable (dump energy) Ease of Use Sustainability Practicality Total Score Rank321 Continue?no Develop

 9 kW photovoltaic array  33 kWh battery capacity GE Stand-alone Cell Tower Analysisdeveloped by Andy Lau and EDSGN PV Array Size9kw Controller efficiency0.97 Turbine Efficiency0.4 from 0.20 to 0.65 Turbine diameter0ft Battery charging efficiency0.97 Generator effiency Battery Capacity (effective)33kwh Battery discharging efficiency kwh/m2-day Max Min Avg ManaguaSum (kwh) Turbine output0 kwh PV output18,062 kwh Generator output0 kwh Generator fuel0 gal Generator hours0 hr Dump energy4,463 kwh

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

Cell Phone Tower Solar Panel Hut

 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

Any Questions???