Geothermal Closed-Loop Calculator

Enter the configuration parameters, then press the Calculate button.

U-tube Design	Reservoir Properties	Rock/Fluid Properties
Depth (m):	T surface (C):	Thermal diffusivity (m2/sec):
Horiz length (m):	Geothermal gradient (C/m):	Conductivity (W/m-C):
Hole radius (m):	Downhole temperature (C): 175	Fluid heat capacity (J/kg-C):
Flow rate (kg/s):
Injection temperature (C) :

At 1 year:
Thermal output = 1,200 kW
Producing temperature = 67.31 C.

This calculation is based on the Ramey equation, applied in three parts (downward vertical flow in the injector, horizontal flow along the lateral, and upward vertical flow in the producer):

Horne, R.N., and K. Shinohara. "Wellbore Heat Loss in Production and Injection Wells." J Pet Technol 31 (1979): 116-118. doi: https://doi.org/10.2118/7153-PA

Ramey, H.J.. "Wellbore Heat Transmission." J Pet Technol 14 (1962): 427-435. doi: https://doi.org/10.2118/96-PA