Heiselberg, Per

Jensen, Rasmus Lund

Sørensen, Karl Grau

An existing computer model for dynamic hygrothermal analysis of buildings has been extended with a multizone airflow model based on loop equations to account for the coupled thermal and airflow in natural and hybrid ventilated buildings.An existing computer model for dynamic hygrothermal analysis of buildings has been extended with a multizone airflow model based on loop equations to account for the coupled thermal and airflow in natural and hybrid ventilated buildings

    Aalborg UniversitetIntegration of a Multizone Airflow Model into a Thermal simulation ProgramJensen, Rasmus Lund; Sørensen, Karl Grau; Heiselberg, Per KvolsPublication date:2007Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Jensen, R. L., Sørensen, K. G., & Heiselberg, P. (2007). Integration of a Multizone Airflow Model into a Thermalsimulation Program. Poster session presented at The International IBPSA Building Simulation Conference andExhibition, Beijing, China.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: May 01, 2017INTEGRATION OF A MULTIZONE AIRFLOWMODEL INTO A THERMAL SIMULATION PROGRAMRasmus L. Jensen1, Karl Grau2, and Per K. Heiselberg11 Department of Civil Engineering, Aalborg University, Denmark2 Danish Building Research Institute, Aalborg University, DenmarkSUMMARYAn existing computer model for dynamic hygrothermal analysis of buildings has been extended with a multizoneairflow model based on loop equations to account for the coupled thermal and airflow in natural and hybridventilated buildings.CONCLUSIONSThe first experience with using the loop equations appears promising. Solving the equation system requires onlyfew iterations to convert, typically les than 3, and no problems with converging has been detected in thispreliminary stage.LOOP EQUATIONSRasmus Lund Jensen, rlj@civil.aau.dk, www.civil.aau.dkDepartment of Civil Engineering, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, DenmarkVERIFICATION OF THE AIR FLOW MODELBSIM USER INTERFACESimView, the user interface of BSim for editing and viewing thelayout of the buildingBSIM DATA MODEL OF A BUILDINGwindbuoyancyloss PPP Δ+Δ=ΔVerification of the airflow model-0,03-0,02-0,0100,010,020,030 96 192 288 384 480 576 672Number of time step (four per hour)Difference in simulated and calculated results []   Difference in mass flow [%]Difference in mass flow [g/s]Air flow in TZ1-150-100-500501001502002500 96 192 288 384 480 576 672Number of time step (four per hour)Air flow [h-1]Outdoor0TZ18TZ213267451092111090346 7851Windoor1Windoor2Windoor4Windoor3

Integration of a Multizone Airflow Model into a Thermal simulation Program

Grau, Karl

Integration of a Multizone Airflow Model into a Thermal Simulation Program

An existing computer model for dynamic hygrothermal analysis of buildings has been extended with a multizone airflow model based on loop equations to account for the coupled thermal and airflow in natural and hybrid ventilated buildings.In water distribution network and related fields loop equations have been widely used to resolve the flow of water and other fluids. In the field of natural ventilation the loop equation method have rarely been used in spite of its quality. Mainly due to problems with automatically setting up the independent loops.The model described in this paper uses a methodology adopted from water distribution network that automatically sets up the independent loops and is easy to implement into a computer program.Finally an example of verification of the model is given which demonstrates the ability of the models to accurately predict the airflow of a simple multizone building.An existing computer model for dynamic hygrothermal analysis of buildings has been extended with a multizone airflow model based on loop equations to account for the coupled thermal and airflow in natural and hybrid ventilated buildings.In water distribution network and related fields loop equations have been widely used to resolve the flow of water and other fluids. In the field of natural ventilation the loop equation method have rarely been used in spite of its quality. Mainly due to problems with automatically setting up the independent loops. The model described in this paper uses a methodology adopted from water distribution network that automatically sets up the independent loops and is easy to implement into a computer program.Finally an example of verification of the model is given which demonstrates the ability of the models to accurately predict the airflow of a simple multizone building.</p

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