Walls thermal resistance measurement with an Energy Room method. Uncertainty analysis of different approaches
The measurement of thermal performance of real structure can be performed by different approach such as coheating method, use of heat flow sensors or by thermal resistance measurement of product by guarded hot plate apparatus and calculation. Whatever the method used the determination of experimental uncertainties of thermal wall or room performance remains a huge challenge. A test bench called was developed in order to evaluate the uncertainties of these different methods. A complete room of 3.45 x 3.62 x 2.29 m was built within an environmental chamber. This energy room has been specially carried out to reduce all the unknown heat loss. This test platform is able to perform measurements under controlled conditions in temperature. Each face of the room is independent and regulated in temperature. A test specimen is set up on one face on the room while the other ones are highly insulated thanks to vacuum insulation products to limit heat losses. The experimental set up was numerically validated using COMSOL Multiphysics V5.2 in order to evaluate the heat loss through the different walls. The room is instrumented with heat flow sensors, hygrometers and 100 thermocouples. The tests were performed on homogeneous and well known test specimen. The uncertainties associated to the thermal resistance of the tested specimen were measurement for each method. Results will be compared and discuss. The uncertainty associated to thermal resistance of the structure is between of 10% and 20%.
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Alain Koenen (POC,Primary Presenter,Author), Alain.Koenen@lne.fr;
Damien Marquis (Author,Co-Author), firstname.lastname@example.org;