### Design #### Building Configuration (3-Story Module) - 45 residents total (15 per floor) - Footprint: 4,300 sq ft per floor - Total area: 12,900 sq ft - Height: 36 ft (12 ft per floor) - Roof area: 4,300 sq ft usable for solar/thermal #### Energy Systems Integration ##### Solar PV System - Required capacity: 75 kW (5 kWh/day × 45 residents ÷ 3 hours equivalent full sun) - Roof area needed: 3,000 sq ft (75 kW × 40 sq ft/kW) - Available roof: 4,300 sq ft (adequate with space for thermal) - Annual generation: 82,125 kWh (75 kW × 1,095 kWh/kW/year) - System cost: $150,000 ($2/W installed) - Lifespan: 25 years - Annual maintenance: 40 hours, $500 ##### Solar Thermal System - Collection area: 900 sq ft - Peak capacity: 45 kW thermal - Storage: 2,000 gallons - System cost: $90,000 - Lifespan: 30 years - Annual maintenance: 30 hours, $400 ### Lifespan-Based Cost Analysis *Per person costs based on 45 residents* | cost | dollars | hours | | -------------------------------- | ------- | ----- | | amortized initial building costs | $1264 | 4.37 | | annual maintenance | $269 | 13.3 | | **Total** | $1533 | 17.67 | #### Amortized Initial Building Costs | Component | Initial Cost ($/hrs) | Lifespan | Annual Cost ($/hrs) | Per Person ($/hrs) | Notes | | ------------------ | -------------------- | -------- | ------------------- | ------------------ | --------------------------------------- | | Foundation | $125,000/480 | 75 | $1,667/6.4 | $37/0.14 | Forms, rebar, concrete, waterproofing | | Structural Frame | $250,000/960 | 75 | $3,333/12.8 | $74/0.28 | Engineered wood frame, decking, bracing | | Walls & Insulation | $245,000/1,200 | 40 | $6,125/30 | $136/0.67 | High-performance assembly, air sealing | | Main Electrical | $85,000/320 | 30 | $2,833/10.7 | $63/0.24 | Distribution, panels, safety systems | | Rainwater System | $30,000/160 | 30 | $1,000/5.3 | $22/0.12 | Collection, filtration, storage | | Drainage Systems | $35,000/240 | 30 | $1,167/8 | $26/0.18 | Site drainage, piping networks | | Windows & Doors | $175,000/320 | 25 | $7,000/12.8 | $156/0.28 | Triple-pane windows, insulated doors | | Roofing | $125,000/280 | 20 | $6,250/14 | $139/0.31 | Membrane roofing, insulation | | Mini-Split HVAC | $85,000/240 | 15 | $5,667/16 | $126/0.36 | Heat pumps, distribution | | Solar PV | $150,000/200 | 25 | $6,000/8 | $133/0.18 | 75kW system, inverters | | Well & Pump | $25,000/80 | 15 | $1,667/5.3 | $37/0.12 | Well drilling, pump system | | ERV System | $15,000/120 | 15 | $1,000/8 | $22/0.18 | Ventilation, heat recovery | | Compost System | $45,000/160 | 20 | $2,250/8 | $50/0.18 | Collection, processing | | Greywater System | $25,000/120 | 15 | $1,667/8 | $37/0.18 | Treatment, distribution | | Lighting | $45,000/200 | 15 | $3,000/13.3 | $67/0.30 | LED fixtures, controls | | Flooring | $45,000/240 | 15 | $3,000/16 | $67/0.36 | Durable materials | | Cabinetry | $65,000/280 | 20 | $3,250/14 | $72/0.31 | Built-in storage | | **TOTAL** | **$1,570,000/5,600** | - | **$56,876/196.6** | **$1,264/4.37** | | #### Annual Maintenance Costs | System | Material Cost | Hours | Per Person Cost | Per Person Hours | |--------|--------------|-------|-----------------|------------------| | HVAC & ERV | $1,800 | 64 | $40 | 1.4 | | Water Systems | $1,300 | 52 | $29 | 1.2 | | Composting/Greywater | $3,200 | 208 | $71 | 4.6 | | Solar & Electrical | $800 | 24 | $18 | 0.5 | | Building Envelope | $1,800 | 52 | $40 | 1.2 | | Interior Finishes | $1,500 | 52 | $33 | 1.2 | | Structure & Site | $1,700 | 144 | $38 | 3.2 | **Annual Per Person Maintenance: $269 and 13.3 hours**