HYDRAULIC ANALYSISOPTIMAL DESIGN OF DISTRICT ENERGY SYSTEMS

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HYDRAULIC ANALYSISHYDRAULIC/THERMAL ANALYSIS OF DISTRICT HEATINGAND COOLING IS ONE OF RAMBOLL’S CORECOMPETENCIES. RAMBOLL HAS CARRIED OUTHYDRAULIC ANALYSIS FOR MORE THAN 35 YEARS.

Why?

Hydraulic calculations and thermalanalysis are prerequisites for correctdimensioning of utility supplynetworks, for new schemes as wellas for expansion or renewal ofexisting networks. The calculationsensure that pipework dimensionsare optimised both technically andeconomically. The hydraulic analysisis also a very important part offeasibility studies for investigatingthe potential for district heating ordistrict cooling in different areas. By periodically updating thecalculations, for instance on anannual basis, potential bottlenecksin the network or problems relatedto existing pumps and/orproduction capacity issues can bedetected before becoming critical. Regarding pipe installation andrenewal tasks, the hydraulic analysisprovides an overview of potentialissues associated with breakdowns/operational changes. In dailyoperation, real-time simulationsoffer support to operators fordecisions related to temperatureand pump optimisation. Integration of GIS and hydraulicanalysis provide a very powerful

tool for maintenance and planningfor upgrades and expansion as theGIS data from the pipeline registrycan be quickly combined withimpact analysis of the networkregarding capacity, heat loss andprice.

Extensive expertise and flexibility

Ramboll has a team of engineerswho perform hydraulic analysis on adaily basis for clients with large andsmall schemes for both districtheating and district coolingnetworks. Ramboll has extensiveexpertise in surge analysis/transienthydraulics (water hammer analysis),i.e. calculation of pressure/flowconditions in case of pump failure,inadvertent valve closure, controlresponse, cavitation etc. Ramboll can help determine whichcalculation tool is the most suitedfor the task at hand, e.g. usingRamboll’s own calculation programSR2 or programs such as Termis. This flexibility means that Rambollcan provide independent advice,and at the same time use theprogram preferred by the client.

SR2

SR2 is a powerful calculation tool

for both stationary and dynamichydraulic/thermal calculations forutility networks such as districtheating, district cooling, watersupply or firewater networks. TheSR2 program suite has beendeveloped over a period of morethan 35 years. SR2 has a verystrong and proven calculationengine which ensures quick,accurate and stable calculations. The SR2 user interface is fullyintegrated with the GIS standardprogram ArcGIS, providing an easyand clear interface and optimalways to present the results. Use ofArcGIS ensures full integration withthe existing pipeline registrationand consumer account systems, sothat data does not need to bemaintained in multiple systems. Inaddition, there are extensiveillustrative possibilities, speciallydesigned for analysis of districtheating and cooling networks. With an optimised hydraulic system,the pipeline dimensions can oftenbe made smaller than in a systemthat is not optimised, without a lossof capacity. Reducing dimensionscan save money, in both capital andoperating costs.

With a water hammer analysis usingSR2 to design safety measures, it ispossible to protect the networkagainst major and expensivedamage related to pump failure etc.in future operations. Data from a SCADA system can beutilised in order to make real-timesimulations for optimising theoperation. Together with our partners softwarespecialised for planning andoptimisation, SR2 gives our clients acomplete package for planning andcontrolling their energy systems.

Termis

Termis is used in many plants andits strength is the online modelling,using SCADA data to simulate thecurrent operation. Termis is GIS-based, thus providing a goodoverview of pipelines, consumer useand related results. Termis can be used for real-timeenergy management andtemperature optimisation.

Contacts

Scandinavia:Søren Vesterby Knudsensork@ramboll.comPhone: +45 5161 8696 Canada/USA:Pernille M Overbyepmo@ramboll.comPhone: +1 (289) 834 4426 UK:Olof JangstenOlof.Jangsten@ramboll.comPhone: +44 7508011983 Middle East:Jens Ole Hansenjeoh@ramboll.comPhone: +45 51618591

SELECTED REFERENCESEXTRACTS FROMSR2 AND TERMISBoth SR2 and Termisoffer extensive illu-strative possibilities,enabling optimaldesign of districtenergy systems.

Bridgeport, CT, USGuelph, ON, CanadaBrampton, ON, CanadaOakville, ON, CanadaSheffield, UKGreenwich Peninsula, London, UKIslington, London, UKCraigmillar, Edinburgh, UKMilan, ItalyKiel, Germany

Hoeglede/Roeselare, BelgiumSouth KoreaCTR / Metropolitan Copenhagen Heating TransmissionCompany, DenmarkVEKS / Western Copenhagen Combined Heat and Powercompany, DenmarkVestforbrænding /Western Copenhagen waste-to-energyplant, DenmarkNordforbrænding /Northern Copenhagen waste-to-energy plant, Denmark