Hybrid ventilation in two interconnected rooms with a buoyancy source

Autores
Tovar, R.; Linden, P. F.; Thomas, Luis Pablo
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The design of energy efficient buildings and the potential for using solar energy for heating and cooling is contingent upon optimizing the building ventilation systems. In this paper we study the ventilation of two interconnected spaces, such as adjacent offices or areas in an open plan office. The goal is to locate return vents to increase the efficiency of night ventilation and to reduce energy consumption.The flow in two interconnected rooms of similar sizes is studied experimentally using a tank divided by an interior vertical wall. A forced buoyancy source with a finite volume flux is located in the ceiling of one-room and an unforced vent is opened in the ceiling of the other room.The goal of the study is to understand the transient cooling/heating that occurs in this two-room system when a forced cold-air vent is located in the ceiling of the first room and a return ventilation exit is located in the second. In particular, we investigate the effects of varying the number of openings and their vertical positions in the interconnecting wall. First, a single opening at the bottom, middle or top of the shared wall is examined. Second, the case of two openings in the wall is considered, with the openings located at the top–bottom,top –middle, bottom –middle, and finally at two mid locations in the wall. The results are compared with the one-room case, which represents the reference case. It was found that, irrespective of the number and locations of the openings, the flow evolves into a quasi-stationary stably stratified two-layer system, with the depths of the layers being different in each room.The average temperature inside each room initially decreases linearly with time and approaches the supply-air temperature at large times.This initial linear decrease holds until cold-air leaves the unforced room through the top-vent at time t_e. Subsequently, temperature decreases as an exponential function of time with a characteristic filling time s =V /Q_s ,where V is the total volume of both rooms and Q_s is the source volume flux. The efficiency of the ventilation depends on the time t_e, and this depends, in turn, on an exchange flow that is established between the two-rooms by the differences in density in each room. For a single opening, the exchange flow takes place as a two-way flow in the opening, while for two openings the flow is from the forced room through the lower opening and in the opposite direction through the upper opening. When the upper opening is located below the ceiling, this flow from the unforced room ‘shields ’the return vent from the dense fluid, thereby increasing the efficiency of the ventilation.
Fil: Tovar, R.. Universidad Nacional Autónoma de México; México
Fil: Linden, P. F.. University of California at San Diego; Estados Unidos
Fil: Thomas, Luis Pablo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina
Materia
Natural Ventilation
Buoyancy-Driven Flows
Thermal sources
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/239831

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spelling Hybrid ventilation in two interconnected rooms with a buoyancy sourceTovar, R.Linden, P. F.Thomas, Luis PabloNatural VentilationBuoyancy-Driven FlowsThermal sourceshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The design of energy efficient buildings and the potential for using solar energy for heating and cooling is contingent upon optimizing the building ventilation systems. In this paper we study the ventilation of two interconnected spaces, such as adjacent offices or areas in an open plan office. The goal is to locate return vents to increase the efficiency of night ventilation and to reduce energy consumption.The flow in two interconnected rooms of similar sizes is studied experimentally using a tank divided by an interior vertical wall. A forced buoyancy source with a finite volume flux is located in the ceiling of one-room and an unforced vent is opened in the ceiling of the other room.The goal of the study is to understand the transient cooling/heating that occurs in this two-room system when a forced cold-air vent is located in the ceiling of the first room and a return ventilation exit is located in the second. In particular, we investigate the effects of varying the number of openings and their vertical positions in the interconnecting wall. First, a single opening at the bottom, middle or top of the shared wall is examined. Second, the case of two openings in the wall is considered, with the openings located at the top–bottom,top –middle, bottom –middle, and finally at two mid locations in the wall. The results are compared with the one-room case, which represents the reference case. It was found that, irrespective of the number and locations of the openings, the flow evolves into a quasi-stationary stably stratified two-layer system, with the depths of the layers being different in each room.The average temperature inside each room initially decreases linearly with time and approaches the supply-air temperature at large times.This initial linear decrease holds until cold-air leaves the unforced room through the top-vent at time t_e. Subsequently, temperature decreases as an exponential function of time with a characteristic filling time s =V /Q_s ,where V is the total volume of both rooms and Q_s is the source volume flux. The efficiency of the ventilation depends on the time t_e, and this depends, in turn, on an exchange flow that is established between the two-rooms by the differences in density in each room. For a single opening, the exchange flow takes place as a two-way flow in the opening, while for two openings the flow is from the forced room through the lower opening and in the opposite direction through the upper opening. When the upper opening is located below the ceiling, this flow from the unforced room ‘shields ’the return vent from the dense fluid, thereby increasing the efficiency of the ventilation.Fil: Tovar, R.. Universidad Nacional Autónoma de México; MéxicoFil: Linden, P. F.. University of California at San Diego; Estados UnidosFil: Thomas, Luis Pablo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; ArgentinaPergamon-Elsevier Science Ltd2007-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/239831Tovar, R.; Linden, P. F.; Thomas, Luis Pablo; Hybrid ventilation in two interconnected rooms with a buoyancy source; Pergamon-Elsevier Science Ltd; Solar Energy; 81; 5; 12-2007; 683-6910038-092XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0038092X0600226Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.solener.2006.08.009info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:24:04Zoai:ri.conicet.gov.ar:11336/239831instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:24:04.324CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Hybrid ventilation in two interconnected rooms with a buoyancy source
title Hybrid ventilation in two interconnected rooms with a buoyancy source
spellingShingle Hybrid ventilation in two interconnected rooms with a buoyancy source
Tovar, R.
Natural Ventilation
Buoyancy-Driven Flows
Thermal sources
title_short Hybrid ventilation in two interconnected rooms with a buoyancy source
title_full Hybrid ventilation in two interconnected rooms with a buoyancy source
title_fullStr Hybrid ventilation in two interconnected rooms with a buoyancy source
title_full_unstemmed Hybrid ventilation in two interconnected rooms with a buoyancy source
title_sort Hybrid ventilation in two interconnected rooms with a buoyancy source
dc.creator.none.fl_str_mv Tovar, R.
Linden, P. F.
Thomas, Luis Pablo
author Tovar, R.
author_facet Tovar, R.
Linden, P. F.
Thomas, Luis Pablo
author_role author
author2 Linden, P. F.
Thomas, Luis Pablo
author2_role author
author
dc.subject.none.fl_str_mv Natural Ventilation
Buoyancy-Driven Flows
Thermal sources
topic Natural Ventilation
Buoyancy-Driven Flows
Thermal sources
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The design of energy efficient buildings and the potential for using solar energy for heating and cooling is contingent upon optimizing the building ventilation systems. In this paper we study the ventilation of two interconnected spaces, such as adjacent offices or areas in an open plan office. The goal is to locate return vents to increase the efficiency of night ventilation and to reduce energy consumption.The flow in two interconnected rooms of similar sizes is studied experimentally using a tank divided by an interior vertical wall. A forced buoyancy source with a finite volume flux is located in the ceiling of one-room and an unforced vent is opened in the ceiling of the other room.The goal of the study is to understand the transient cooling/heating that occurs in this two-room system when a forced cold-air vent is located in the ceiling of the first room and a return ventilation exit is located in the second. In particular, we investigate the effects of varying the number of openings and their vertical positions in the interconnecting wall. First, a single opening at the bottom, middle or top of the shared wall is examined. Second, the case of two openings in the wall is considered, with the openings located at the top–bottom,top –middle, bottom –middle, and finally at two mid locations in the wall. The results are compared with the one-room case, which represents the reference case. It was found that, irrespective of the number and locations of the openings, the flow evolves into a quasi-stationary stably stratified two-layer system, with the depths of the layers being different in each room.The average temperature inside each room initially decreases linearly with time and approaches the supply-air temperature at large times.This initial linear decrease holds until cold-air leaves the unforced room through the top-vent at time t_e. Subsequently, temperature decreases as an exponential function of time with a characteristic filling time s =V /Q_s ,where V is the total volume of both rooms and Q_s is the source volume flux. The efficiency of the ventilation depends on the time t_e, and this depends, in turn, on an exchange flow that is established between the two-rooms by the differences in density in each room. For a single opening, the exchange flow takes place as a two-way flow in the opening, while for two openings the flow is from the forced room through the lower opening and in the opposite direction through the upper opening. When the upper opening is located below the ceiling, this flow from the unforced room ‘shields ’the return vent from the dense fluid, thereby increasing the efficiency of the ventilation.
Fil: Tovar, R.. Universidad Nacional Autónoma de México; México
Fil: Linden, P. F.. University of California at San Diego; Estados Unidos
Fil: Thomas, Luis Pablo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina
description The design of energy efficient buildings and the potential for using solar energy for heating and cooling is contingent upon optimizing the building ventilation systems. In this paper we study the ventilation of two interconnected spaces, such as adjacent offices or areas in an open plan office. The goal is to locate return vents to increase the efficiency of night ventilation and to reduce energy consumption.The flow in two interconnected rooms of similar sizes is studied experimentally using a tank divided by an interior vertical wall. A forced buoyancy source with a finite volume flux is located in the ceiling of one-room and an unforced vent is opened in the ceiling of the other room.The goal of the study is to understand the transient cooling/heating that occurs in this two-room system when a forced cold-air vent is located in the ceiling of the first room and a return ventilation exit is located in the second. In particular, we investigate the effects of varying the number of openings and their vertical positions in the interconnecting wall. First, a single opening at the bottom, middle or top of the shared wall is examined. Second, the case of two openings in the wall is considered, with the openings located at the top–bottom,top –middle, bottom –middle, and finally at two mid locations in the wall. The results are compared with the one-room case, which represents the reference case. It was found that, irrespective of the number and locations of the openings, the flow evolves into a quasi-stationary stably stratified two-layer system, with the depths of the layers being different in each room.The average temperature inside each room initially decreases linearly with time and approaches the supply-air temperature at large times.This initial linear decrease holds until cold-air leaves the unforced room through the top-vent at time t_e. Subsequently, temperature decreases as an exponential function of time with a characteristic filling time s =V /Q_s ,where V is the total volume of both rooms and Q_s is the source volume flux. The efficiency of the ventilation depends on the time t_e, and this depends, in turn, on an exchange flow that is established between the two-rooms by the differences in density in each room. For a single opening, the exchange flow takes place as a two-way flow in the opening, while for two openings the flow is from the forced room through the lower opening and in the opposite direction through the upper opening. When the upper opening is located below the ceiling, this flow from the unforced room ‘shields ’the return vent from the dense fluid, thereby increasing the efficiency of the ventilation.
publishDate 2007
dc.date.none.fl_str_mv 2007-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/239831
Tovar, R.; Linden, P. F.; Thomas, Luis Pablo; Hybrid ventilation in two interconnected rooms with a buoyancy source; Pergamon-Elsevier Science Ltd; Solar Energy; 81; 5; 12-2007; 683-691
0038-092X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/239831
identifier_str_mv Tovar, R.; Linden, P. F.; Thomas, Luis Pablo; Hybrid ventilation in two interconnected rooms with a buoyancy source; Pergamon-Elsevier Science Ltd; Solar Energy; 81; 5; 12-2007; 683-691
0038-092X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0038092X0600226X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.solener.2006.08.009
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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