Thread: Coal GCV - cr4globalspec. Sep 07, 2017· The GCV (Gross Calorific Value) for high moisture content coal, peat, lignite, etc, can be determined on either the ARB (As Received Basis) or the ADB (Air Dried Basis) The ADB should always be higher since the moisture that has been absorbed during shipping and handling is removed prior to testing, while the ARB ,