02289nas a2200217 4500008004100000245009600041210006900137490000800206520155700214100002601771700001801797700002701815700002201842700001801864700002301882700001701905700002901922700002001951700001801971856008201989 2017 eng d00aDynamic equation-based thermo-hydraulic pipe model for district heating and cooling systems0 aDynamic equationbased thermohydraulic pipe model for district he0 v1513 a
Simulation and optimisation of district heating and cooling networks requires efficient and realistic models of the individual network elements in order to correctly represent heat losses or gains, temperature propagation and pressure drops. Due to more recent thermal networks incorporating meshing decentralised heat and cold sources, the system often has to deal with variable temperatures and mass flow rates, with flow reversal occurring more frequently. This paper presents the mathematical derivation and software implementation in Modelica of a thermo-hydraulic model for thermal networks that meets the above requirements and compares it to both experimental data and a commonly used model. Good correspondence between experimental data from a controlled test set-up and simulations using the presented model was found. Compared to measurement data from a real district heating network, the simulation results led to a larger error than in the controlled test set-up, but the general trend is still approximated closely and the model yields results similar to a pipe model from the Modelica Standard Library. However, the presented model simulates 1.7 (for low number of volumes) to 68 (for highly discretized pipes) times faster than a conventional model for a realistic test case. A working implementation of the presented model is made openly available within the IBPSA Modelica Library. The model is robust in the sense that grid size and time step do not need to be adapted to the flow rate, as is the case in finite volume models.
1 avan der Heijde, Brahm1 aFuchs, Marcus1 aTugores, Carles, Ribas1 aSchweiger, Gerald1 aSartor, Kevin1 aBasciotti, Daniele1 aMuller, Dirk1 aNytsch-Geusen, Christoph1 aWetter, Michael1 aHelsen, Lieve uhttps://simulationresearch.lbl.gov/publications/dynamic-equation-based-thermo00608nas a2200157 4500008004100000022001400041245013400055210006900189300001200258490000700270100003100277700002100308700002900329700001700358856007500375 2009 eng d a0171-544500aNeue objektorientierte hygrothermische Modell-Bibliothek zur Ermittlung des hygrothermischen und hygienischen Komforts in Räumen0 aNeue objektorientierte hygrothermische ModellBibliothek zur Ermi a271-2780 v311 aNouidui, Thierry, Stephane1 aSedlbauer, Klaus1 aNytsch-Geusen, Christoph1 aKießl, Kurt uhttps://simulationresearch.lbl.gov/publications/neue-objektorientierte00440nas a2200109 4500008004100000245006000041210006000101260002000161100002900181700003100210856008900241 2008 eng d00aGebäudesimulation mit adaptiven Modellierungsansätzen0 aGebäudesimulation mit adaptiven Modellierungsansätzen aKassel, Germany1 aNytsch-Geusen, Christoph1 aNouidui, Thierry, Stephane uhttps://simulationresearch.lbl.gov/publications/geb%C3%A4udesimulation-mit-adaptiven02149nas a2200181 4500008004100000022002200041245021800063210006900281260002400350300001500374490000600389520138300395100003101778700002901809700001801838700002101856856009001877 2008 eng d a978-87-7877-265-700aObject-oriented hygrothermal building physics library as a tool to predict and to ensure a thermal and hygric indoor comfort in building construction by using a Predicted-Mean-Vote (PMV) control ventilation system0 aObjectoriented hygrothermal building physics library as a tool t aCopenhagen, Denmark app.825-8320 v23 aThe indoor temperature and humidity conditions of the building envelope are important parameters for the evaluation of the thermal and hygric indoor comfort. In the research project GENSIM a new hygrothermal building library, based on the object- and equation-oriented model description language Modelica® has been developed by the Fraunhofer Institutes IBP and FIRST. This library includes many models as for instance a hygrothermal wall model, an air volume model, a zone model, a window model and an environment model. Due to the object-oriented modelling approach, some models of this library can be configured to a complex hygrothermal room model, which can predict the time dependent indoor temperature and humidity conditions in a building construction. In this paper we will introduce in a first step the object-oriented hygrothermal room model of this library. In a second step, the validation of the room model with some field experiments will be shown. In a third step we willpresent some simulation results, we obtained by coupling the room model with an implemented Predicted-Mean-Vote (PMV) control ventilation system to predict and to ensure a thermal and hygric indoor comfort in one case study. In the conclusion, the possible range of future applications of this new hygrothermal building physics library and demands for further research are indicated.
1 aNouidui, Thierry, Stephane1 aNytsch-Geusen, Christoph1 aHolm, Andreas1 aSedlbauer, Klaus uhttps://simulationresearch.lbl.gov/publications/object-oriented-hygrothermal-building00792nas a2200229 4500008004100000245009200041210006900133300001300202100002900215700001700244700001900261700002000280700001800300700002100318700002200339700001900361700002100380700002300401700003100424700002200455856008500477 2006 eng d00aAdvanced modeling and simulation techniques in MOSILAB: A system development case study0 aAdvanced modeling and simulation techniques in MOSILAB A system app.63-721 aNytsch-Geusen, Christoph1 aErnst, Thilo1 aSchwarz, Peter1 aVetter, Mathias1 aHolm, Andreas1 aLeopold, Juergen1 aMattes, Alexander1 aNordwig, Andre1 aSchneider, Peter1 aWittwer, Christoph1 aNouidui, Thierry, Stephane1 aSchmidt, Gerhardt uhttps://simulationresearch.lbl.gov/publications/advanced-modeling-and-simulation00641nas a2200169 4500008004100000020001800041245009600059210007000155260003000225100002900255700001900284700002000303700002300323700003100346700002100377856007300398 2006 eng d a3-934681-45-X00aMOSILAB: Ein Modelica-Simulationswerkzeug zur energetischen Gebäude- und Anlagensimulation0 aMOSILAB Ein ModelicaSimulationswerkzeug zur energetischen Gebäud aBad Staffelstein, Germany1 aNytsch-Geusen, Christoph1 aNordwig, Andre1 aVetter, Mathias1 aWittwer, Christoph1 aNouidui, Thierry, Stephane1 aSchneider, Peter uhttps://simulationresearch.lbl.gov/publications/mosilab-ein-modelica00621nas a2200157 4500008004100000020002200041022001800063245011500081210006900196260002000265300001500285100003100300700002900331700001800360856008500378 2006 eng d a978-3-00-019823-6 a3-00-019823-700aValidierung der eindimensionalen hygrothermischen Wandmodelle der Modelica-Bibliothek "BuildingPhysicsLibrary"0 aValidierung der eindimensionalen hygrothermischen Wandmodelle de aMunich, Germany app.144-1461 aNouidui, Thierry, Stephane1 aNytsch-Geusen, Christoph1 aHolm, Andreas uhttps://simulationresearch.lbl.gov/publications/validierung-der-eindimensionalen00574nas a2200145 4500008004100000020001800041245009000059210006900149260002700218100002900245700003100274700001800305700001900323856008600342 2005 eng d a2-553-01152-000aA hygrothermal building model based on the object-oriented modeling language Modelica0 ahygrothermal building model based on the objectoriented modeling aMontreal, Canadac20051 aNytsch-Geusen, Christoph1 aNouidui, Thierry, Stephane1 aHolm, Andreas1 aHaupt, Wolfram uhttps://simulationresearch.lbl.gov/publications/hygrothermal-building-model-based00873nas a2200253 4500008004100000245010600041210006900147260002100216300001500237100002900252700001700281700002100298700002000319700001800339700002100357700001800378700001900396700001900415700002300434700003100457700002200488700002200510856008700532 2005 eng d00aMOSILAB: Development of a modelica based generic simulation tool supporting modal structural dynamics0 aMOSILAB Development of a modelica based generic simulation tool aHamburg, Germany app.527-5341 aNytsch-Geusen, Christoph1 aErnst, Thilo1 aSchneider, Peter1 aVetter, Mathias1 aHolm, Andreas1 aLeopold, Juergen1 aDoll, Ullrich1 aNordwig, Andre1 aSchwarz, Peter1 aWittwer, Christoph1 aNouidui, Thierry, Stephane1 aSchmidt, Gerhardt1 aMattes, Alexander uhttps://simulationresearch.lbl.gov/publications/mosilab-development-modelica-based