whose fault is it? loop installation contractor vs. hvac contractor geothermal alliance of illinois...

Whose Fault Is It?

Loop Installation Contractor Vs.

HVAC Contractor

Geothermal Alliance of IllinoisGeothermal Alliance of Illinois

Dom Durbin and Jeff HurstDom Durbin and Jeff Hurst

Basic Responsibilities

Loop Contractor• Design Loop and Piping

System Based on Calculations Provided By Others

• Confirm Soil Conditions Relevant to Pipe Placement

• Install Ground Loop to Industry Standards

• Purge System or Provide Volume and Purging Requirement Calculations

HVAC Contractor• Determine Building Loads

and Associated Ground Loads

• Install Geo Units and Air /Hydronic Delivery Systems

• Size and Install Circulating Pump/s (Possibly Purge)

• Commission System and Educate Owner on Design Use for Best Performance


Hey Dom, 4 ton Horizontal, 100 Old Creek Road

Thanks For The Work Jeff, We’re On The Way!


Horizontal Trencher, Maybe…


Plan B…


End Result


Hot Loop

Why Is The Loop Hot?

Whose Fault Is It?

How Can We Prevent It From Happening Again?

What Can We Do To Fix It?



Soil Thermal PropertiesSoil Thermal Properties

ThermalTexture Class

Thermal Conductivity

Thermal Diffusivity

W/m °K Btu/ft hr °F cm²/sec ft²/day

Sand or Gravel 0.77 0.44 0.0045 0.42

Silt 1.67 0.96 _____ _____

Clay 1.11 0.64 0.0054 0.50

Loam 0.91 0.52 0.0049 0.46

Saturated Sand 2.50 1.44 0.0093 0.86

Saturated Silt or Clay 1.67 0.96 0.0066 0.61

Hey Dom, 5 Ton Pond Loop, Sink Hole Drive, Hundred Year Old Farm House on The Left



Why is Every Pond 20 Ft Deep?


300 ft slinky coilper ton

4 ft between coils

ConcreteBlocks for

weight

Nylon Cable Tiesto secure blocks

300 ft coil per tonseparated by scrap

pipe

Traditional Coiled Pond Loop- Southern Climates

High Efficiency Slinky/Matt PondLoop - Northern Climates

Heavy Duty PlasticSafety matting

8-10 Bricks forweight

Reverse ReturnHeader

Nylon Cable Tiesto secure Netting

and bricks

3 foot separation

Pond and Lake LoopsPond and Lake Loops


Cold Loop, The Pond is an Ice Cube

• Excessive Run Times


Cold Loop

Why Is The Loop Cold?

Whose Fault Is It?




Hey Dom, 10 Ton Vertical, On Mansion Hill, Just Get It In and I’ll Take It From There



Common Loop and Multi Pump Non Pressurized Flow Station


Self Purging Non PressurizedSelf Purging Non Pressurized

Cannot Flush Loop

Why Can We Not Remove The Air?

Whose Fault Is It?





Flow Rates to Achieve 2 ft/secFlow Rates to Achieve 2 ft/sec

Velocity = Gal/ Min * 1 cubic ft/7.48 Gal * 1 min/60 sec * 1/Area of pipe = Ft/Second


Circulating pump @ 3GPM Per Ton, Where does Velocity Fall Short?Circulating pump @ 3GPM Per Ton, Where does Velocity Fall Short?

Flush Cart with a Boost Pump in Series


System Flow Rates to Achieve 2 ft/sec Can Be CalculatedSystem Flow Rates to Achieve 2 ft/sec Can Be Calculated

I Can’t Flush It, Sam Can’t Even Flush It


Cannot Flush Loop

Why Can We Not Remove The Air?

Whose Fault Is It?




Reverse Return Header Configuration


whose fault is it? loop installation contractor vs. hvac contractor geothermal alliance of illinois...

Documents

pressurized slide

ftsecond slide

jeff hurst slide

cold loop

loop cold

ground loop

hot loop

loop hot