Hi there Yes it is standard practise to input the weighted average thermal properties when you have different layers. Regards, François Badinier Development Engineer ICAX Ltd 1 Berry Street London EC1M 5PS -----Original Message----- Hello, everyone. I try to use Type557a to simulate the performance of borehole ground heat exchangers in a multi-layer ground. However, I don't know what values I should use for the store thermal conductivity and volumetric heat capacity (Parameters 9 & 10). Should I input the average values of all the ground layers? It seems that these two parameters influence the outlet fluid temperature substantially. Please advise. Thank you! Best Regards LEE, Chun Kwong |