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Kendrick Pool Heating Projectfor the City of Kendrick

Friday, December 4th, 2009

Team iHeat

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Problem StatementDevise a cost-effective heating method to bring the city pool

to 80F by Kendrick Locust Blossom Festival at the end of May.

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Primary Client Needs• Safety• Energy Conservation• Temperature• Longevity• Low-cost

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ModelingWater heating energy requirements (52F to 80F)Percent shading at pool site RETScreen modeling software

Useful solar gainAverage ambient temperature in Kendrick

Current thermal blanket usageLocal Fuel Costs

ElectricityPropane

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Considered Solutions

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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

SolutionHybrid System

POOL

FILTERS

SURGE TANKS

PROPANE

HEATER

SOLAR ARRAY

MAIN PUMP

BOOSTER PUMP

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SolutionPropane Heater (400,000 BTUH)

• Cost: • Initial:• $2500 (Heater)

$1500 (Installation, Lines)= $4000

• Annual : • $500 (Propane, Tank Rental)

• Longevity: 10+ yrs • Time to heat: 7 days

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SolutionSpirals (385 ft2 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

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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

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Economic Analysis System Major Components Fixed Cost

Pure Solar-Commercial Solar Panels

$7.00/ft2 x 2400 ft2

Large Pump$18,800

Pure Solar- iHeat Spiral $2.25/ft2 x 2400 ft2

Large PumpExpensive Framing

$10,500

Pure Propane 1,200,000 BTUH Heater $20,000

Hybrid Solution 350,000 BTUH Heater$ 2.25/ft2 x 385 ft2

Small PumpMinimal Framing

$5,850

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RecommendationsOptimize 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

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Site Plan

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Site Plan

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Site Plan

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Questions

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