GROUNDHEATEXCHANGER:SLINKY

This models a slinky horizontal heat exchanger placed in a series of trenches The model uses the model developed by: Xiong, Z., D.E. Fisher, and J.D. Spitler. 2015. Development and Validation of a Slinky Ground Heat Exchanger Model. Applied Energy 141: 57-69.

Name

Inlet Node Name

Type: node

Outlet Node Name

Type: node

Design Flow Rate

Type: real number
Unit: m3/s
Default: 0.002

Soil Thermal Conductivity

Type: real number
Unit: W/m-K
Default: 1.08

Soil Density

Type: real number
Unit: kg/m3
Default: 962

Soil Specific Heat

Type: real number
Unit: J/kg-K
Default: 2576

Pipe Thermal Conductivity

Type: real number
Unit: W/m-K
Default: 0.4

Pipe Density

Type: real number
Unit: kg/m3
Default: 641

Pipe Specific Heat

Type: real number
Unit: J/kg-K
Default: 2405

Pipe Outer Diameter

Type: real number
Unit: m
Default: 0.02667

Pipe Thickness

Type: real number
Unit: m
Default: 0.002413

Heat Exchanger Configuration

Type: choice (Vertical or Horizontal)
This is the orientation of the heat exchanger

Coil Diameter

Type: real number
This is the diameter of the heat exchanger coil
Unit: m
Default: 1.0

Coil Pitch

Type: real number
This is the center-to-center distance between coils
Unit: m
Default: 0.20

Trench Depth

Type: real number
This is the distance from the ground surface to the trench bottom
Unit: m
Default: 1.8

Trench Length

Type: real number
This is the total length of a single trench This assumes the heat exchanger runs the full length of the trench
Unit: m
Default: 10

Number of Trenches

Type: integer
This is the number of parallel trenches that has a heat exchanger, one per trench
Minimum: 1
Default: 1

Horizontal Spacing Between Pipes

Type: real number
This represents the average horizontal spacing between any two trenches for heat exchangers that have multiple trenches
Unit: m
Default: 2.0

Undisturbed Ground Temperature Model Type

Type: choice (Site:GroundTemperature:Undisturbed:FiniteDifference, Site:GroundTemperature:Undisturbed:KusudaAchenbach or Site:GroundTemperature:Undisturbed:Xing)

Undisturbed Ground Temperature Model Name

Type: list of objects (SITE:GROUNDTEMPERATURE:UNDISTURBED:XING, SITE:GROUNDTEMPERATURE:UNDISTURBED:KUSUDAACHENBACH or SITE:GROUNDTEMPERATURE:UNDISTURBED:FINITEDIFFERENCE)

Maximum Length of Simulation

Type: real number
Unit: years