12th International Symposium on District Heating and Cooling

The <strong>12th</strong> <strong>International</strong> <strong>Symposium</strong> on District Heating and Cooling,September 5 th to September 7 th , 2010, Tallinn, EstoniaFURTHER INFORMATIONQuestions concerning the paper can be addressed to:Liandon B.V.www.liandon.comwww.pipelab.nlDijkgraaf 46920 AB DuivenThe NetherlandsThermaflex <strong>International</strong> Holding B.V.www.thermaflex.comVeerweg 15145 NS WaalwijkThe NetherlandsCONCLUSIONFlexible Polybutylene piping, insulated withPolyethylene foam is a recent development, leavingample room for product improvement. Experimentaldata shows rapid improvement in heat lossperformance.By optimizing both quantity (thickness) and quality offlexible Polyethylene foam, and by using the specifichydraulic properties of Polybutylene piping, the heatloss performance of conventional rigid steel pipingsystems insulated with polyurethane foam, is withinreach.If the current rate of improvement of the PB-PE-PEflexible piping is maintained, total distribution systemheat losses will be comparable to conventional rigidSteel-PUR-PE piping. The evident benefits of flexibilitywould become available without the current heat losspenalty.ACKNOWLEDGEMENTSpecial thanks are due to Ivo Smits who did all thecalculations for this paper and made all the graphs. Asmall change in approach may result in a lot ofrecalculation. Thanks also to Camilla Persson forsupplying us with a MathCad implementation of themultipole method back in 2008 and Pàll Valdimarssonfor the invention of Pipelab, which set me off on thisroad at the symposium in Helsinki, 1995.REFERENCES[1] I.M. Smits, J.T. van Wijnkoop, E.J.H.M. van derVen, ―Comparison of competitive (semi) flexiblepiping systems by means of heat lossmeasurement‖, in Proc. of the <strong>12th</strong> <strong>International</strong><strong>Symposium</strong> on District Heating and Cooling,Tallinn, Estonia (2010).[2] J. Korsman, I.M. Smits, S. de Boer, ―Systemoptimization of a new plastic piping system‖, inProc. of the 11th <strong>International</strong> <strong>Symposium</strong> onDistrict Heating and Cooling, Reykjavik, Iceland(2008).[3] J.T. van Wijnkoop, E.J.H.M. van der Ven,―Verification of heat loss measurements‖, in Proc.of the <strong>12th</strong> <strong>International</strong> <strong>Symposium</strong> on DistrictHeating and Cooling, Tallinn, Estonia (2010).[4] E.J.H.M. van der Ven, R.J. van Arendonk, ―Heatloss of flexible plastic pipe systems, analysis andoptimization‖, in Proc. of the <strong>12th</strong> <strong>International</strong><strong>Symposium</strong> on District Heating and Cooling,Tallinn, Estonia (2010).[5] J. Claesson, C. Persson, ―Steady-state thermalproblem of insulated pipes solved with themultipole method‖, Chalmers University ofTechnology, Report 2005:3. (2005)[6] P. Valdimarsson, "Graph-theoretical calculationmodel for simulation of water and energy flow indistrict heating systems", in Proc. of the 5th<strong>International</strong> <strong>Symposium</strong> on Automation of DistrictHeating Systems, Helsinki, Finland. (1995).[7] J. Korsman, S. de Boer, I.M. Smits, ―Cost benefitsand long term behaviour of a new all plastic pipingsystem‖, IEA DHC|CHP Annex VIII research report(2008)317