This book contains the Proceedings of the Fourth Baltic Heat Transfer Conference, which was held in the Lithuanian Energy Institute in Kaunas, Lithuania, August 25-27, 2003. The Conference was organized by the Lithuanian Energy Institute and Kaunas University of Technology on initiative of the Scientific and Organizing Committee of the Baltic Heat Transfer Conferences. The former three conferences look place in Göteborg, Sweden in August 1991, in Riga-Jurmala, Latvia in August 1995 and in Gdansk, Poland in September 1999. Adding to what has already said, there in a hope that the...