[BLDG-SIM] Soil properties

[Deru, Michael]

Jannes,

 

Soil thermal properties are very much a function of the soil moisture
content, which makes it a little difficult to assign constant values to
the properties.  However, that is what we have to do without solving the
heat and moisture transfer problems simultaneously.  I did a comparison
between a heat transfer model and a heat and moisture transfer model for
my disseration.  You can get reasonable results with the heat transfer
model with a constant value of thermal conductivity.  The best result
was to model the top 1 meter of soil with one value of thermal
conductivity and soil below this with a higher thermal conductivity to
simulate a higher moisture content.  My dissertation (A Model for
Ground-Coupled Heat and Moisture Transfer from Buildings) is available
from http://www.nrel.gov/docs/fy03osti/33954.pdf.   Appendix C presents
information on soil properties as a function of moisture content.
Specifically, Figure C.4 shows the thermal conductivity of soil with
moisture content.  I would recommend assuming a volumetric moisture
content between 155 and 20% for setting the thermal properties.

 

Michael Deru, PhD

Senior Engineer 

Center for Buildings and Thermal Systems

National Renewable Energy Laboratory

Golden Colorado

303-384-7503

 

 

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of jacco
Sent: Monday, May 21, 2007 5:39 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Soil properties

 

Hello, 

I was wondering if somebody could tell me where i can get data for the
density, thermal conductivity and termal capacities for silt and sandy
clay soils?

With kind regards, 

Jannes 

 

 
 
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