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Implementation and evaluation of air flow and heat transfer routines for building simulation tools

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Tuomaala, Pekka
dc.date.accessioned 2012-02-10T09:28:59Z
dc.date.available 2012-02-10T09:28:59Z
dc.date.issued 2002-08-23
dc.identifier.isbn 951-38-5996-7
dc.identifier.issn 1455-0849
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2205
dc.description.abstract Environmental, epidemiological and economical reasons increase the pressure to design, construct and maintain better buildings in the future. Therefore, a new assembly of simulation routines for predicting both ventilation and heat transfer processes of buildings were studied. The work was limited to implementation and evaluation of new air flow and heat transfer routines for building simulation tools. Development of simulation tool user-interfaces, post-processors and component database have all been excluded. The simulation routines were implemented in a new building simulation tool BUS++, which was based on discretisation and solution of mass, momentum, and heat balance equations. Ventilation fans, external wind and thermal buoyancy were included as driving forces for air infiltration and ventilation process. Two completely new routines were developed and implemented to obtain more reliable estimations of dynamic and multi-mode heat transfer covering thermal convection, conduction, and radiation. The first new routine focused on defining a rational thermal calculation network, and the second one concentrated on simulation of thermal radiation in a room. Finally, a rigorous set of tests were conducted to validate the air flow and heat transfer routines implemented in BUS++. The test set included commonly utilised analytical verifications and inter-model comparisons as well as completely new empirical validation test cases. The new rational gridding method reduced simulation times by 44 % to 86 % in a typical slab test case with a cyclic excitation, and the new routine for thermal radiation was up to ten times faster than the conventional matrix radiosity method. In addition, the simulation and validation data showed good agreement, especially for the analytical verifications and inter-model comparisons with typical differences less than 2 %. Despite these promising results, more research work is needed to further develop the simulation routines. In the future, special attention ought to be paid to simulation tool user-interfaces to facilitate full utilisation of the simulation tool by a wide range of users. en
dc.format.extent 45, [52]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher VTT Technical Research Centre of Finland en
dc.publisher VTT fi
dc.relation.ispartofseries VTT publications en
dc.relation.ispartofseries 471 en
dc.relation.haspart Tuomaala, P. 1993. New Building Air Flow Simulation Model: Theoretical Basis. Building Services Engineering Research and Technology, Vol. 14, Number 4, pp. 151-157.
dc.relation.haspart Tuomaala, P. and Rahola, J. 1995. Combined Air Flow and Thermal Simulation of Buildings. Building and Environment, Vol. 30, Number 2, pp. 255-265.
dc.relation.haspart Tuomaala, P., Piira, K. and Vuolle, M. 2000. A Rational Method for the Distribution of Nodes in Modelling of Transient Heat Conduction in Plane Slabs. Building and Environment, Vol. 35, pp. 397-406.
dc.relation.haspart Tuomaala, P. and Piira, K. 2000. Thermal radiation in a Room: An Improved Progressive Refinement Method. Building Services Engineering Research and Technology, Vol. 21, Number 1, pp. 9-17.
dc.relation.haspart Tuomaala, P., Simonson, C. J. and Piira, K. 2002. Validation of Coupled Airflow and Heat Transfer Routines in a Building Simulation Tool. Accepted for publication in ASHRAE Transactions, Vol. 108, Number 1, pp. 435-449.
dc.subject.other Mechanical engineering en
dc.subject.other Civil engineering en
dc.title Implementation and evaluation of air flow and heat transfer routines for building simulation tools en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Mechanical Engineering en
dc.contributor.department Konetekniikan osasto fi
dc.subject.keyword air conditioning en
dc.subject.keyword HVAC systems en
dc.subject.keyword heat transfer en
dc.subject.keyword air flow en
dc.subject.keyword air quality en
dc.subject.keyword buildings en
dc.subject.keyword simulation en
dc.subject.keyword BUS++ en
dc.subject.keyword networks en
dc.subject.keyword data processing en
dc.identifier.urn urn:nbn:fi:tkk-001758
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
local.aalto.digifolder Aalto_63796
local.aalto.digiauth ask

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