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, EstoniaGRP pipesflexible pipepipeline laying techniqueself-compacting materialreuse of excavated soilcombined laying withother supply pipesstacked layinginsulation as a castingcompoundinsulating backfilltrench-less layingtechniquesnominal diameter< DN 150nominal diameter> DN 150+ ++ 0 ++ + 0 + ++ - +++ -- ++ + ++ 0 ++ 0 ++ ++new district heating line ++ + + ++ ++ ++ ++ - + ++renovation measure 0 - 0 ++ ++ 0 -- ++ + --construction site in anurban areaconstruction site in arural areayet to be built housingestate+ ++ -- ++ 0 + + + 0 +++ + ++ 0 ++ ++ ++ + + 0+ + ++ + + ++ ++ - + 0existing housing estate + ++ -- ++ + + + - 0 ++NOMENCLATURER λ,jacketinsulance of the jacket pipeλ sthe coefficient of thermal conductivity forthe soilR αinsulance of the convective heat transferinside the pipeλ iλ i,50 °Cλ Cλ steelthe coefficient of thermal conductivity forthe PUR insulationthe coefficient of thermal conductivity forthe PUR insulation at 50 °Cthe coefficient of thermal conductivity forthe jacket pipethe coefficient of thermal conductivity forthe service pipeR 0R λ,embedmentD iD 0D insulationD Csurface transition insulanceinsulance of the insulating material usedin the embedmentinner diameter of the service pipeouter diameter of the service pipeouter diameter of the PUR insulationouter diameter of the jacket pipeλ embedmenαR hR sR iR λ,steelt the coefficient of thermal conductivity forthe insulating material used in theembedmentheat transfer coefficientinsulance of the heat exchange betweenflow and return pipeinsulance of the soilinsulance of the insulation materialinsulance of the service pipeT flowT returnT soilT i,averageT fluidU flowU returnflow temperaturereturn temperaturetemperature of the soilaverage temperature of the PURinsulationflow or return temperatureheat loss coefficient for the flow pipeheat loss coefficient for the return pipe303
The <strong>12th</strong> <strong>International</strong> <strong>Symposium</strong> on District Heating and Cooling,September 5 th to September 7 th , 2010, Tallinn, EstoniaZCs embedmentΦ f + Φ rC 0IR tiTtkRewdλΔpLρP pumpVηdistance from surface to the middle of thepipedistance between the centre lines of thetwo pipesspace between the pipe and the trenchwallheat loss per pipe pairnet present valueinvestmentnet cash flow (annual savings)required rate of returngiven periodthe time of the cash flowsurface roughness of the service pipeReynolds numberflow speedinner diameter of the service pipethe kinematic viscositythe pipe friction factorpressure losslength of the pipethe density of the heating waterpump powerflow ratepump efficiencyREFERENCES[1] Alexander Goebel, Alternative Fernwärme-Verlegesysteme, Mannheim (2010)[2] European Committee for Standardization,EN 13941 ANNEX D, Brussels (2009)[3] European Committee for Standardization,EN 15632, Brussels (2009)[4] Dipl.-Ing. Heinz-Werner Hoffmann, Dipl.-Ing.Torsten Göhler and Dr.-Ing. Manfred Klöpsch,Fernwärmeleitungsbau mit Recyclingmaterial, MVVForschungsbericht, Mannheim (2006)[5] Dipl.-Ing. Heinz-Werner Hoffmann and ZoltanDioszeghy-Günter, Neuartige Verlegetechniken fürdas Kunststoff-Verbundmantelrohr-System Band 1,MVV Forschungsbericht, Mannheim (1995)[6] Fratzscher et. al., Energiewirtschaft fürVerfahrenstechniker, VEB Deutscher Verlag fürGrundstoffindustrie, Leipzig (1982)[7] VDI-Wärmeatlas, Verein Deutscher Ingenieure,Heidelberg (2006), Dba 5, Dba 13[8] KE KELIT Kunststoffwerk Gesellschaft m.b.H.,Thermosand© (Broschüre), Linz (2006), p. 6[9] VDI-Wärmeatlas, Verein Deutscher Ingenieure,Heidelberg (2006), Ded 12[10] VDI-Wärmeatlas, Verein Deutscher Ingenieure,Heidelberg (2006), Ded 10[11] Heinz Schmid, Excel mit VBA in derWärmetechnik, C. F. Müller Verlag, Heidelberg(2008), p. 26[12] Dipl.-Ing. (FH) Frank Espig, Schadensstatistik KMR2007 des AGFW, article published in the„EuroHeat&Power―(2008), issue 10304
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the street the more shallow the sha
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P-1P-4P-9P-7E-5P-14P-8The 1
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to heating costs of 14,5 ct/kWh. Th
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academic access is facilitated as t
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1. CHP system operation in A2. Ther
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is covered by operating HOB. In oth
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produce heat and electricity. Fluct
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To assure that the temperatures mea
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production and provide for marginal
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In addition, it can also be observe
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owner is normally only interested i
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12th International Symposium on District Heating and Cooling

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