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Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

NAME

r.green.gshp.technical - Calculate the Ground Source Heat Pump technical potential using the ASHRAE method.

KEYWORDS

raster, geothermal, renewable energy

SYNOPSIS

r.green.gshp.technical
r.green.gshp.technical --help
r.green.gshp.technical [-d] ground_conductivity=name [ground_diffusivity_rast=name] [ground_diffusivity_value=double] [ground_temp_rast=name] [ground_temp_value=double] [g_loads_6h_rast=name] [g_loads_6h_value=double] [g_loads_1m_rast=name] [g_loads_1m_value=double] [g_loads_1y_rast=name] [g_loads_1y_value=double] [fluid_capacity=double] [fluid_massflow=double] [fluid_inlettemp=double] [bh_radius=double] [bh_convection=double] [bh_resistence=double] [pipe_inner_radius=double] [pipe_outer_radius=double] [pipe_distance=double] [k_pipe=double] [k_grout=double] [field_distance=double] [field_number=integer] [field_ratio=double] [bhe_length=name] [bhe_field_length=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-d
Debug with intermediate maps
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters:

ground_conductivity=name [required]
Raster with depth-averaged ground thermal conductivity lambda [W m-1 K-1]
ground_diffusivity_rast=name
Raster with depth-averaged ground diffusivity [m2 day-1]
ground_diffusivity_value=double
Value with depth-averaged ground diffusivity [m2 day-1]
Default: 0.086
ground_temp_rast=name
Raster with the initial ground temperature T0 [degrees C]
ground_temp_value=double
Value with the initial ground temperature T0 [degrees C]
Default: 10.
g_loads_6h_rast=name
Peak of the maximum 6 hourly ground loads [W]
g_loads_6h_value=double
Peak of the maximum 6 hourly ground loads [W]
Default: 60.
g_loads_1m_rast=name
Month with the maximum ground loads [W]
g_loads_1m_value=double
Month with the maximum ground loads [W]
Default: 15.
g_loads_1y_rast=name
Yearly average ground loads [W]
g_loads_1y_value=double
Yearly average ground loads [W]
Default: 5.
fluid_capacity=double
Fluid capacity Cp [J kg-1 K-1]
Default: 4200.
fluid_massflow=double
Fluid massflow [kg s-1 kW-1]
Default: 0.050
fluid_inlettemp=double
Inlet temperature [degrees C]
Default: 2.
bh_radius=double
Borehole radius [m]
Default: 0.06
bh_convection=double
Internal convection coefficient [W m-2 K-1]
Default: 1.52
bh_resistence=double
Borehole thermal resistence [m K W-1]
Default: nan
pipe_inner_radius=double
Borehole pipe inner radius [m]
Default: 0.01365
pipe_outer_radius=double
Borehole pipe outer radius [m]
Default: 0.0167
pipe_distance=double
Center-to-center distance between pipes [m]
Default: 0.0511
k_pipe=double
Pipe thermal conductivity [W m-1 K-1]
Default: 0.42
k_grout=double
Grout thermal conductivity [W m-1 K-1]
Default: 1.52
field_distance=double
Distance between boreholes heat exchanger
Default: 6.1
field_number=integer
Number of borehole heat exchanger
Default: 2
field_ratio=double
Borefield aspect ratio
Default: 1.2
bhe_length=name
Name of output raster map with the geothermal length of the BHE [m]
bhe_field_length=name
Name of output raster map with the geothermal length of the BHE field [m]

Table of contents

DESCRIPTION

r.green.gshp.technical calculates the lenght of the borehole for Groud Source Heat Pump plants.

NOTES

The required inputs are the ground source conductivity and the ground loads.

EXAMPLES

python r.green.gshp.technical.py --overwrite ground_conductivity=g_conductivity ground_diffusivity_rast=g_diffusivity ground_temp_rast=g_temperature g_loads_6h_rast=g_loads_6h g_loads_1m_rast=g_loads_1m g_loads_1y_rast=g_loads_1y fluid_capacity=4000. fluid_massflow=0.074 fluid_inlettemp=4.44 bh_radius=0.054 pipe_inner_radius=0.01365 pipe_outer_radius=0.0167 bh_convection=1000. pipe_distance=0.0471 k_pipe=0.45 k_grout=1.73 field_distance=6.1 field_number=120 field_ratio=1.2 bhe_length=len_bhe bhe_field_length=len_bhe_field -d

SEE ALSO

r.green.gshp.technical

AUTHOR

Pietro Zambelli (Eurac Research, Bolzano, Italy)

SOURCE CODE

Available at: r.green.gshp.technical source code (history)

Latest change: Thursday Feb 03 09:32:35 2022 in commit: f17c792f5de56c64ecfbe63ec315307872cf9d5c

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

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