Fig. 4From: First field application of temperature sensor modules for groundwater flow detection near borehole heat exchangerSimulated temperatures at the TSM at 82 m depth. The left and right columns show the temperatures at the inner and outer ring sensors, respectively. In the upper row (a, c), the incident angle of the groundwater flow is varied, whereas the velocity is varied, for flow in the direction from sensor 6 to 2 in the lower row (b, d), which equals 247.5°Back to article page