| system | initial cost ($ + hrs) / unit | annualized cost ($ + hrs) / unit | sqft building | acre land | revenue | market cost | benefits | | ------------------------- | ----------------------------- | -------------------------------- | ------------- | --------- | ------- | ------------- | -------------------------------------------------------------------------------- | | Cold Water Storage System | $2,540 + 300 hrs | $609 + 54 hrs | 16 sqft | 0 | $0 | $5,000-10,499 | Health benefits from cold plunge therapy, energy efficiency, customized solution | - This system is designed with reliability as the primary concern, followed by cost-effectiveness. Commercial alternatives would cost $5,000-10,499 upfront, plus ongoing maintenance. ```dv dv.paragraph(("https://jimr.fyi/" + dv.currentFilePath.replace(/\.md$/, "").replace(/ /g, "+"))) ``` #### Assumptions - System provides near-freezing water (35°F) to residential bathtub - Non-pressurized design with 150 gallon capacity - Insulated utility room (4' x 4' x 6') with R-60 insulation - Daily use scenario (one cold plunge per day) - Operating schedule: 24/7 with automated temperature maintenance - Internal resource utilization per year: - Electricity: ~120 kWh - Water: ~18,250 gallons (assuming 50 gallons per daily use) #### Market Solutions $3,650-6,650/year - Commercial cold plunge tubs: $3,000-10,499 initial cost - High-end commercial products (The Plunge, Sun Home Cold Plunge Pro): $5,000-10,499 - Operating costs: $365/year for maintenance supplies - Budget options (stock tank with ice): $100-250 initial + $3,650-11,680/year for daily ice #### Labor 24 Hours/year | task | hours/year | notes | | ------------------------ | ---------- | ------------------------------------- | | Weekly temperature check | 8.7 | 10 minutes per week | | Monthly leak inspection | 3 | 15 minutes per month | | Quarterly cleaning | 8 | 2 hours per quarter | | Annual maintenance | 4.3 | System overhaul and water replacement | | total labor (hours) | 24 | | #### Operating Costs $340/year | component | external cost ($) | notes | | ------------------- | ----------------- | ------------------------------------- | | Electricity | $120 | ~$10/month for daily use | | Water | $80 | Municipal water for filling/refilling | | Filter replacements | $45 | For UV sterilizer | | Cleaning supplies | $50 | Food-grade sanitizer | | Misc. maintenance | $45 | Replacement parts, sealants | | total annual cost | $340 | | #### Initial Costs $2,540 + 300 hrs -> $269 + 32 hrs/year | Component | Initial Cost ($ + hrs) | Lifespan (Years) | Amortized Cost/Year ($ + hrs) | Justification | | ------------------------- | ---------------------- | ---------------- | ----------------------------- | ----------------------------------------------------- | | Utility Room Construction | $630 + 80 | 20 | $31.5 + 4 | Rigid foam insulation with higher R-value | | Water Storage Tank | $385 + 40 | 10 | $38.5 + 4 | Norwesco 150 gal vertical water tank | | Plumbing Components | $275 + 60 | 10 | $27.5 + 6 | SharkBite PEX system for reliability | | Cooling System | $1,050 + 80 | 8 | $131.25 + 10 | Active Aqua 1/2 HP water chiller | | Monitoring & Safety | $200 + 40 | 5 | $40 + 8 | Inkbird temperature controller with redundant sensors | | total initial cost | $2,540 + 300 | - | $268.75 + 32 | | #### Specific Components List ##### Utility Room Construction ($630) - Johns Manville AP Foil-Faced Polyiso Foam Board (R-13, 2" thick): $210 (7 sheets) - Owens Corning R-23 mineral wool insulation: $180 (6 packages) - Great Stuff Pro foam sealant: $45 (3 cans) - OSB sheathing (3/8"): $45 (2 sheets) - 6-mil poly vapor barrier (Husky): $30 - Foam board adhesive: $20 - Weatherstrip foam tape: $15 - 2x4 pressure-treated lumber: $85 ##### Water Storage Tank ($385) - Norwesco 150 gallon vertical water tank: $345 - Bulkhead fittings (2): $40 ##### Plumbing Components ($275) - SharkBite PEX tubing (1/2", 100ft): $85 - SharkBite fittings kit: $60 - Fluidmaster 400A toilet fill valve (for auto refill): $15 - Watts 9D backflow preventer: $35 - Delta diverter valve: $45 - Armaflex pipe insulation: $35 ##### Cooling System ($1,050) - Active Aqua 1/2 HP water chiller (AACH50): $900 - Ecoplus 396 GPH submersible pump: $35 - Kerick MA052 float valve (redundant level control): $20 - SunTouch WarmWire floor heating mat (under tank for emergency thaw): $95 ##### Monitoring & Safety ($200) - Inkbird ITC-308 temperature controller: $35 - Redundant temperature sensors (3): $30 - Govee WiFi water leak sensors (2): $40 - Honeywell automatic water shutoff valve: $60 - GFCI outlet adapters (2): $25 - UV sterilizer light: $10 #### Reliability Enhancement Features 1. Redundant Temperature Control: Primary Inkbird controller with backup sensors at different tank levels 2. Emergency Heat System: SunTouch floor heating mat under tank to prevent freezing if chiller fails 3. Dual Level Controls: Primary float valve with secondary Kerick valve for overflow prevention 4. Quick-Connect Plumbing: SharkBite fittings allow for rapid repairs without specialized tools 5. UV Sterilization: Prevents biological growth without chemicals 6. Leak Detection with Auto Shutoff: Govee sensors trigger Honeywell shutoff valve if leaks detected~120 kWh - Water: ~18,250 gallons (assuming 50 gallons per daily use) #### Market Solutions $3,650-6,650/year - Commercial cold plunge tubs: $3,000-10,499 initial cost - High-end commercial products (The Plunge, Sun Home Cold Plunge Pro): $5,000-10,499 - Operating costs: $365/year for maintenance supplies - Budget options (stock tank with ice): $100-250 initial + $3,650-11,680/year for daily ice #### Labor 24 Hours/year | task | hours/year | notes | | ------------------------ | ---------- | ------------------------------------- | | Weekly temperature check | 8.7 | 10 minutes per week | | Monthly leak inspection | 3 | 15 minutes per month | | Quarterly cleaning | 8 | 2 hours per quarter | | Annual maintenance | 4.3 | System overhaul and water replacement | | total labor (hours) | 24 | | #### Operating Costs $350/year | component | external cost ($) | notes | | ------------------- | ----------------- | ------------------------------------- | | Electricity | $120 | ~$10/month for daily use | | Water | $80 | Municipal water for filling/refilling | | Filter replacements | $50 | UV filter or mineral-based sanitizer | | Cleaning supplies | $50 | Food-grade sanitizer | | Misc. maintenance | $50 | Replacement parts, sealants | | total annual cost | $350 | | #### Initial Costs $2,245-3,060 + 300 hrs -> $299-390 + 30 hrs/year | Component | Initial Cost ($ + hrs) | Lifespan (Years) | Amortized Cost/Year ($ + hrs) | Justification | | ------------------------- | ---------------------- | ---------------- | ----------------------------- | ------------------------------------------------ | | Utility Room Construction | $550-700 + 80 | 20 | $27.5-35 + 4 | Insulated room (R-60) for temperature control | | Water Storage Tank | $350-500 + 40 | 10 | $35-50 + 4 | 120-150 gal polyethylene food-grade tank | | Plumbing Components | $230-360 + 60 | 10 | $23-36 + 6 | PEX tubing, valves, fittings, pipe insulation | | Cooling System | $1,000-1,300 + 80 | 8 | $125-162.5 + 10 | 1/2 HP water chiller, submersible pump | | Monitoring & Safety | $115-200 + 40 | 5 | $23-40 + 8 | Temperature controllers, sensors, leak detection | | total initial cost | $2,245-3,060 + 300 | - | $233.5-323.5 + 32 | | #### System Outputs | Output Type | Daily Units | Annual Units | Internal Cost ($/unit) | Internal Cost (hrs/unit) | Notes | | ---------------- | ----------- | ------------ | ---------------------- | ------------------------ | ---------------------- | | Cold Plunge Bath | 1 | 365 | $0.96 | 0.07 | 35°F water for bathtub | #### Revenue $0/year | service category | revenue ($) | notes | | --------------------- | ----------- | ------------------------------------------- | | Cold plunge therapies | $0 | For community use only, no external revenue | | total | $0 | | _Note: This system is designed for community well-being rather than revenue generation. Commercial alternatives would cost $5,000-10,499 upfront, plus ongoing maintenance._