# Gi-4 Specifications

## Gi-4 ENGINEERED GROUND HEAT EXCHANGER PERTINENT DATA

#### Material

**HDPE 100 (PE4710)**

PE4710 is an improved high-performance polyethylene compound designed for pressure pipe. Compared to conventional pressure piping materials, PE4710 can withstand higher psi (pounds per square inch).

#### Fusion

**IGSHPA and GI certified Standard fusion tools for 4″ HDPE SDR 11**

HDPE pipe provides effortless installation. Our pipe can be joined by various fusion methods including mechanical connections by using the nominal size of 4″.

#### Gi-4 Thermal Resistance*

**0.003h *ft* °F/Btu**

Unlike metals that have high rates of thermal conductivity, plastic pipes are relatively low, thus plastic piping systems will transfer much smaller amounts of heat from the fluid to the external environment.

#### Flow Rate

**2.5 GPM (Re 5513)**

Maximum flow rate recommended

**15 GPM**

Large Port | |
---|---|

3.7404 sq in - 10.6375" perimeter - 1.4065 Hydraulic Diameter | |

Δ P H2O @ 60°F 11 GPM | 1.86 Ft HD or 0.81 psi per 100 Feet |

Δ P 10% Glycol @ 35°F 11 GPM | 2.20 Ft HD or 0.95 psi per 100 Feet |

Δ P 20% Glycol @ 30°F 11 GPM | 2.50 Ft HD or 1.08 psi per 100 Feet |

Small Port | |
---|---|

2.1081 sq in - 6.5567" perimeter - 1.2861 Hydraulic Diameter | |

Δ P H2O @ 60°F 11 GPM | 2.98 Ft HD or 1.29 psi per 100 Feet |

Δ P 10% Glycol @ 35°F 11 GPM | 3.36 Ft HD or 1.45 psi per 100 Feet |

Δ P 20% Glycol @ 30°F 11 GPM | 3.82 Ft HD or 1.65 psi per 100 Feet |

End Caps | |
---|---|

Δ P H2O @ 60°F 11 GPM | 0.07 Ft HD or .028 psi per 100 Feet |

Δ P 10% Glycol @ 35°F 11 GPM | 0.21 Ft HD or .090 psi per 100 Feet |

Δ P 20% Glycol @ 30°F 11 GPM | 0.23 Ft HD or .010 psi per 100 Feet |

%

### Up to 400% Better Heat Conductivity

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### Grout Quantity Reduction with Equivalent Bore Diameters

%

### Reduction in Bore Footage Compared to U-bend

%

### Improved ROI and Energy Savings

%

### Total Active Linear Feet Field Size Reduction

%

### Antifreeze Solution Reduction Compared to Equivalent Systems

#### Shipping

**Pallets of 20′ sticks – 28 sticks/pallet (560 LF) FOB Orion, MI**

#### Availability

**Most orders < 10,000 ft. filled from stock, orders > 10,000 ft. scaled 30-90 days**

#### Grout Required

81 gallons/100 LF in a 6”Ø Borehole

81 gallons/100 LF in a 6”Ø Borehole

#### Capacity per LF

0.3038 Gal (sum of capacity of both S & R ports)

0.3038 Gal (sum of capacity of both S & R ports)

*These values are not for use with most commercial field calculation software. They will return a field that design that is larger than required. Field calculations must be run by Geothermal Innovations to insure a proper design. Alternately, the following values must be modified when using GLD Software (available from Gaia Geothermal, LLC). The Thermal Conductivity of the formation calculated from insitu data must be multiplied by 1.8. The Thermal Diffusivity calculated from insitu data must be used. The appropriate BTR values above must be inserted in the U-Tube tab. This will return the results supported by insitu data using Gi-4 with the listed Thermal Conductivity Grout in a 6” diameter borehole.

## Questions?