for the City of Kendrick Friday, December 4 th,
Problem Statement Devise a cost-effective heating method to bring the city pool to 80F by Kendrick Locust Blossom Festival at the end of May. 2
Primary Client Needs Safety Energy Conservation Temperature Longevity Low-cost 3
Modeling Water heating energy requirements (52F to 80F) Percent shading at pool site RETScreen modeling software Useful solar gain Average ambient temperature in Kendrick Current thermal blanket usage Local Fuel Costs Electricity Propane 4
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Features: Gas heater provides initial warm-up. Sustained solely through solar array and cover. Benefits: Accommodates insufficient sunlight. Minimizes size of heater and size of solar array. Minimizes cost 6 Solution Hybrid System POOL FILTERS SURGE TANKS PROPANE HEATER SOLAR ARRAY MAIN PUMP BOOSTER PUMP
Solution Propane Heater (400,000 BTUH) 7 Cost: Initial: $2500 (Heater) $1500 (Installation, Lines) = $4000 Annual : $500 (Propane, Tank Rental) Longevity: 10+ yrs Time to heat: 7 days
Solution Spirals (385 ft 2 Array) Materials: Drip hose, PVC pipe and fittings, framing, booster pump. Cost: Initial: $850 (14 panels) $1000 (pump) = $1850 Annual : $200-$400 Longevity: 10+ yrs 8
Lexan Panel Option Design Characteristics: PVC manifolds 6mm clear twin-wall Lexan painted black chemically welded Performance Characteristics Comparable efficiency to spiral design High sensitivity to sun angle compared to spiral Ongoing testing 9
10 Economic Analysis SystemMajor ComponentsFixed Cost Pure Solar-Commercial Solar Panels $7.00/ft 2 x 2400 ft 2 Large Pump $18,800 Pure Solar- iHeat Spiral $2.25/ft 2 x 2400 ft 2 Large Pump Expensive Framing $10,500 Pure Propane1,200,000 BTUH Heater$20,000 Hybrid Solution350,000 BTUH Heater $ 2.25/ft 2 x 385 ft 2 Small Pump Minimal Framing $5,850
11 Recommendations Optimize current system: Fix leak Utilize surge tank capacity Reroute sand filter backwash plumbing Maximize pool cover use Prune trees Implement Hybrid System Install propane heater and propane tank Build and plumb solar array Implement differential controller system
12 Site Plan
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