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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/239831
Ver los metadatos del registro completo
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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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1844614236847734784 |
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13.070432 |