Geowatt Engineering

Example 1: Direct cooling or freecooling

Increasingly, borehole heat exchangers are not only used for heating purposes, but also for cooling.

During the cooling period, room cooling (e.g. 18/23°C) is often possible by direct cooling from the borehole heat exchanger field. It is important that the BHE field and the cooling demand are coordinated. If the cooling load is too high, the fluid temperature in the BHE field reaches 18°C prematurely and an increasing shortfall in the required cooling occurs.

back to overview Engineering and Simulations

Example 2: Multi-field management

The dimensioning of BHE fields usually has various objectives:

• Compliance with the minimum permissible average EWS brine temperature according to SIA 384/6 of -1.5°C for 50 years of operation.
• Sufficient supply to all heat and cold consumers
• Optimisation of system costs
• Minimisation of electricity requirements
• The lowest possible pressure loss in the brine circuit (BHE-distribution-HP); very high flow rates can occur, especially when several BHE fields are managed. Optimised control is crucial.