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.theoretical - Calculate the Ground Source Heat Pump potential
KEYWORDS
raster,
geothermal,
renewable energy
SYNOPSIS
r.green.gshp.theoretical
r.green.gshp.theoretical --help
r.green.gshp.theoretical [-d] ground_conductivity=name [heating_season_raster=name] [heating_season_value=double] [power_value=double] [ground_capacity_raster=name] [ground_capacity_value=double] [ground_temp_raster=name] [ground_temp_value=double] [borehole_radius=double] [borehole_resistence=double] [borehole_length=double] [pipe_radius=double] [number_pipes=integer] [grout_conductivity=double] [fluid_limit_temperature=double] [lifetime=integer] power=name energy=name [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]
- heating_season_raster=name
- Raster with the Heating Season [0-365] days
- heating_season_value=double
- Heating Season [0-365] days
- Options: 0-365
- Default: 180.
- power_value=double
- Power value in kW
- Default: nan
- ground_capacity_raster=name
- Raster with depth-averaged ground thermal capacity rho_c [MJ m-3 K-1]
- ground_capacity_value=double
- Value with depth-averaged ground thermal capacity rho_c [MJ m-3 K-1]
- Default: 2.5
- ground_temp_raster=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.
- borehole_radius=double
- Borehole radius [m]
- Default: 0.075
- borehole_resistence=double
- Borehole thermal resistence [m K W-1]
- Default: nan
- borehole_length=double
- Borehole length [m]
- Default: 100
- pipe_radius=double
- Pipe radius [m]
- Default: 0.016
- number_pipes=integer
- Number of pipes in the borehole
- Default: 4
- grout_conductivity=double
- Thermal conductivity of the borehole filling (geothermal grout) [W m-1 K-1]
- Default: 2
- fluid_limit_temperature=double
- Minimum or maximum fluid temperature [degrees C]
- Default: -2
- lifetime=integer
- Simulated lifetime of the plant [years]
- Default: 50
- power=name [required]
- Name of output raster map with the geothermal power potential [W]
- energy=name [required]
- Name of output raster map with the geothermal energy potential [MWh]
- length=name
- Name of output raster map with the geothermal length of the BHE [m]
r.green.gshp.theoretical assess the shallow geothermal potential defined as the thermal power exchanged by a Borehole Heat Exchanger of a certain depth.
This potential depends on the thermal properties of the ground and the plant features.
This module returns two output raster maps with the the energy potential (MWh/year) and the power potential (W).
In this module the output is the theoretical maximum energy that can be converted in the ideal case without considering the financial and spatial constraints.
The required inputs are the the thermal conductivity. If not specific values are indicated, reference values have been assumed for the ground features and the plant.
r.green.gshp.theoretical calculates the potential of shallow geothermal energy by means of and empirical relationship proposed by Casasso et al. (2016) as:
Pgshp=8*(T0 - Tlim) λ L t'c/(-0.619 t'c
log(u's)-0.455 t'c-1.619+4 π Rb)
where
T0 is the undisturbed ground temperature (°C),
Tlim the threshold temperature of the heat carrier
fluid setting to 2°C,
λ is the the
thermal conductivity of the ground (W/(mK)),
L the borehole length (m),
t'c is is
the operating time ratio ,
u's is a parameter depending on the simulaion time and the borehole radius ,
Rb is the thermal resistance (K/W)
This example is based on the case-study of the EUSALP region, located in Europe and covering part of Italian, Slovenian, Austrian, German, Swiss and France territories. The data can be downloades at the following repositories
EUSALP dataset .
r.green.gshp.theoretical \
ground_conductivity=conductivity \
heating_season_raster=season_heating \
ground_temp_raster=ground_temperature \
ground_capacity_value=2.3 \
power=gpot_power \
energy=gpot_energy \
Alessandro Casasso, Rajandrea Sethi, 2016,
"G.POT: A quantitative method for the assessment and mapping of the
shallow geothermal potential"
Energy 106, p 765 --
http://dx.doi.org/10.1016/j.energy.2016.03.091
r.green.hydro.technical,
r.green.hydro.technical
Pietro Zambelli (Eurac Research, Bolzano, Italy), Tested by and manual written by Giulia Garegnani
SOURCE CODE
Available at:
r.green.gshp.theoretical source code
(history)
Latest change: Monday Jan 30 19:52:26 2023 in commit: cac8d9d848299297977d1315b7e90cc3f7698730
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GRASS GIS 8.3.3dev Reference Manual