Objective Loss of heat to the chimney of steam producing boilers amounts to 15 - 20 % of the geat given by fuel combustion.Recovery of this loss by direct exchange smoke/water is prohibited if heavy fuel is used in the boiler, as acid condensate will corrode metallic parts of exchangers.The aim of the project is to demonstrate that recovery is economically feasible if a water/steam pressurized between smoke and the water to by heated.Last interim report pointed 47 375 Kwh energy savings for 2488 hours of data collection. Published literatureL% Belgian patent no 904 602 on the 16th April 1986.1)TechnologyThe thermal diode is formed by a water to steam loop running between a evaporator exchanger inserted in the smoke duel and a condensor exchanger cooled by the make-up water feeding the boiler itself. The fluid used, just purified water, fills the evaporator to a predetermined level. The thermal diode is pressurized by steam to a point where evaporation takes place above the dew point of condensable acids. Regulation of steam introduction is the key of the prevention of corrosion and ordinary materials may be used for the exchanger.2) EconomicsCost of studies, appliances and monitoring 4 000 000 BEF = Eligible cost.3)MonitoringA heat meter is inserted in the cooling water loop.Data are read every eight hours day and night.Boiler is fired five days a week. Programme(s) ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989 Topic(s) 3.4 - INDUSTRY Call for proposal Data not available Funding Scheme DEM - Demonstration contracts Coordinator NOVA PAPER SA EU contribution No data Address DEMEURSTRAAT 67 1511 HUIZINGEN Belgium See on map Total cost No data