SEAS-BuildingEnergyOntology ontology v0.9 The Seas Building specific energy related properties with quantities and units for the ITEA SEAS (Smart Energy Aware Systems) project. 2016-01-26 2016-05-26 seas testing Also known as Thermal Transmittance. The overall heat transfer coefficient U is a measure of the overall ability of a series of conductive and convective barriers to transfer heat. UValue Transmittance