Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany

Table 1

Comparison thermal power of RWTH-1 BHE with Geothermal Aachener springs.

Source	RWTH-1	Geothermal Spings
Flow rate (m^3/h)	4	175
Usage (h/d)	9 h/d	24 h/d
Temperature (°C)	50	60
Thermal power
Direct use (60°C to 25°C); (kW)	117	7146
Bathing or heat pump (25°C to 10°C); (kW)	70	3062