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iHeat Design Reviewfor the City of Kendrick

Thursday, July 30th, 2009

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Overview• Problem Statement• Primary Client Needs• Current System & Recommendations• Thermal Model• Non Traditional Solutions• Off the Shelf Solutions• Custom Built Solutions• Questions

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Problem StatementDevise a cost effective heating method to allow pool usage

as early as Memorial Day weekend.

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Primary Client Needs• Safety• Time of Year• Energy Conservation• Temperature• Longevity• Budget• Simplicity• Aesthetics

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Current System & Recommendations

• Leak

• Cover Usage

• Surge Tanks

• Flow Meter

• Shading

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Thermal ModelInitial Heat Up

Source Temperature Rise

Surface Area BTU/hr

iHeat 25oF 3,480sqft 1,203,241

www.poolinfo.com 25oF 3,480sqft 915,240

www.solardirect.com 25oF 3,480sqft 1,392,000

www.poolproducts.com 25oF 3,480sqft 1,096,200

Increasing the temperature of 5,000 gallons of water 25oF in 24 hours requires an addition of 44,000BTU/hr

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Nontraditional Solutions

• Directly capturing the sun’s heat by painting the pool walls with thermo-sensitive paint or using an advanced thermal cover system.

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• Heater powered by alternative energy source, such as wind, hydroelectrics, or methane gas from compost or manure.

Nontraditional Solutions

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Off-the-Shelf Solutions• Propane Heater

• Electric Heat Pumps

• Direct Solar Panels

• Hybrid System

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Off-the-Shelf SolutionsPropane Heater

• Initial Cost: $3500 - 7,500 • Unit Purchase Price, Installation, Propane Tank, Lines

• Seasonal Operating Expense: $4000-5000• Longevity: ~7 yrs • Time to heat: 3-4 days

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• Initial Cost: $13,000-20,000• Unit Purchase Price, Installation, Lines

• Seasonal Operating Expense: $600-1000• Longevity: 10-15 yrs• Time to heat: 3-4 days

Off-the-Shelf SolutionsElectric Heat Pumps

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• Initial Cost: $12,000-30,000 + installation• Seasonal Operating Expense: $200-400• Longevity: 10-15 yrs• Time to heat: 2-3 weeks

Off-the-Shelf SolutionsDirect Solar Panels

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Combines solar panels with a heater in the same system.

Accommodates insufficient sunlight.

Minimizes size of heater and size of solar array.

Off-the-Shelf SolutionsHybrid System

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Off-the-Shelf SolutionsSummary

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21$0

$20,000

$40,000

$60,000

$80,000

$100,000

$120,000

Off-the-Shelf Long Term Cost Comparison

Heat Pumps LowHeat Pumps HighPropane Heater LowPropane Heater HighSolar Panels LowSolar Panels High

Year

Cum

malt

ive C

ost

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Custom Built Solutions• Solar Array - Spiral • Solar Array - Manifolds & Sheets

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Custom Built SolutionsSolar Array - Spiral• Initial Cost: $5,000-6,000 • Seasonal Operating Expense: $200-400• Longevity: 10+ yrs • Drip hose, PVC fittings, framing

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• Initial Cost: $6,000-7,000• Seasonal Operating Expense: $200-400• Longevity: 10+ yrs• Lexan sheets, PVC manifolds

Custom Built SolutionsSolar Array - Manifolds & Sheets

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System Cost per ft2 ft2 Total

Off-the-Shelf Solar

$ 7.00 2400 $12,000-30,000

Spiral $ 3.00* ? ?

Manifolds & Sheets

$ 3.50* ? ?

Custom Built SolutionsComparison to Off-the-Shelf

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Questions