12th International Symposium on District Heating and Cooling

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The <strong>12th</strong> <strong>International</strong> <strong>Symposium</strong> on District Heating and Cooling,September 5 th to September 7 th , 2010, Tallinn, EstoniaRESULT BASED FUTURE DEVELOPMENTSThe tests have led to improvements to the flexibleplastic pipe products produced by Thermaflex. In thenear future we expect improvements in:Production methods:Starting June 2010 a change in the machineconfiguration will be implemented as an extra step. Thenew configuration improves temperature control in theextruder, which leads to better cell structure.Chemical and physical composition of layer material:Up to a certain degree the anti-radiation agentimproves isolating values. With trial and error the antiradiationagent content is increased. Up till now themaximum content has been limited by productionmethods. Research is required to investigate maximumdesired value for insulating effects.Cell structure and gap between foam and medium pipe:In the tests we see variations in cell structure and gapwidth. Future research will aim at acquiring moredetailed knowledge of these phenomena.Up till now the heat loss performance on single pipeshas been measured and analysed. This has resulted inan understanding of the heat loss principles in districtheating systems. Twin pipe systems will soon betested, analysed and evaluated.In this paper only the heat loss of the Flexalen 600 preinsulatedpipe product has been handled. Informationabout the system can be read in [4] Heat lossoptimization of flexible plastic piping systems, life timeheat loss performance (Korsman et al) and [5] Neweconomical connection solutions (Engel).CONCLUSIONThe results of testing are reliable. Knowledge of theproduct and production has led to promisingimprovements of both.Further research will certainly lead to furtherdevelopments.Heat loss of buried piping [W/m]31.029.027.025.023.021.019.017.015.0Heat lossHeat loss Degassed50 70 90 110 130 150 170 190Outer diameter pipe system [mm]Graph 5: Degassed heat loss values of a buried system ata temperature difference of 60KExamples of product improvementFurther research has led to product improvements.Based on these improvement proposals Thermaflexhas been able to produce new pipe system samples.As represented in graph 5 the new samples have aheat loss decrease up to 16 percent compared to theprevious results.Heat loss of buried piping [W/m]40.035.030.025.020.015.0Heat lossHeat loss New50 70 90 110 130 150 170 190Outer diameter pipe system [mm]Graph 6: New heat loss values of a buried system at atemperature difference of 60KADDENDUMDegassingThe Thermaflex pipe system is liable to the process ofdegassing. Degassing causes the heat loss values torise over the products life time. Extra research on thissubject shows an average heat loss increase of9 percent (range 5–13 percent) (graph 5). Heat lossesare calculated according to EN 15632.117
The <strong>12th</strong> <strong>International</strong> <strong>Symposium</strong> on District Heating and Cooling,September 5 th to September 7 th , 2010, Tallinn, EstoniaACKNOWLEDGEMENTWe would like to acknowledge P. van Rijswijk for hisdedication to all the heat loss measurementsperformed during this research.FURTHER INFORMATIONQuestions concerning the paper may be addressed to:Thermaflex <strong>International</strong> Holding B.V,Veerweg 15145NS WaalwijkThe Netherlandswww.thermaflex.comLiandon B.V.Dijkgraaf 46920AB DuivenThe Netherlandswww.liandon.comREFERENCES[1] EN 15632 District heating pipes, Pre-insulatedflexible pipe systems, Requirements and testmethods[2] P. Wallentén; Lund Institute of Technology,Sweden; 1991, Steady-state heat loss frominsulated pipes[3] E. van der Ven, F. Duursma, H. Korsman, I. Smits;Paper on DHC, Tallinn; 2010, Verification of heatloss measurements conducted on (semi) flexiblepipe systems[4] H. Korsman; Paper on DHC, Tallinn; 2010, Heatloss optimization of flexible plastic piping systems,life time heat loss performance[5] C. Engel and G. Baars, ―New economicalconnection solution for flexible piping systems‖,12 th ISDHC 2010.118
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produce heat and electricity. Fluct
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production and provide for marginal
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In addition, it can also be observe
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Stockholm district heating system a
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12th International Symposium on District Heating and Cooling

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