Skip to content NREL Buildings Research National Renewable Energy Laboratory (NREL)
Field Test Best Practices: A Resource for Practical Residential Building Science

Main menu

Heat Flux Transducer

A heat flux transducer is a sensor that detects the rate of heat flow through a surface.  In buildings, such a device is typically applied to a foundation, such as a slab-on-grade or a basement wall.  This type of measurement may be used as part of the BLC (co-heating) test.  Some typical uses of heat flux transducers are described and illustrated in reference [1].


  1. Maref, W.; Armstrong, M.M.; Saber, M.; Rousseau, M.; Ganapathy, G.; Nicholls, M.; Swinton, M.C. (2012).  Field Energy Performance of an Insulating Concrete Form (ICF) Wall..  IRC-RR-326.  National Research Council Canada.