Experimental study on thermal buoyancy-induced natural ventilation
It is well known that natural ventilation is caused by the outdoor wind velocity and the indoor-outdoor temperature difference. Generally, natural ventilation is rarely caused by one effect alone, but by the coupled form of two effects. However, only the indoor-outdoor temperature difference (ΔT) wa...
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| Veröffentlicht in: | Energy and buildings 2018-10, Vol.177, p.1-11 |
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| container_title | Energy and buildings |
| container_volume | 177 |
| creator | Han, Dong-Hun Kim, Sedong Choi, Jae Hyuk Kim, Yeong Sik Chung, HanShik Jeong, Hyomin Watjanatepin, Napat Ruangpattanawiwat, Chalermpol Choi, Soon-Ho |
| description | It is well known that natural ventilation is caused by the outdoor wind velocity and the indoor-outdoor temperature difference. Generally, natural ventilation is rarely caused by one effect alone, but by the coupled form of two effects. However, only the indoor-outdoor temperature difference (ΔT) was considered to evaluate the characteristic of thermal buoyancy-induced natural ventilation in this experimental study. The indoor-outdoor temperature differences were set to 5, 10, 20 and 30 °C. The measured ventilation rates by changing ΔT were compared to the calculation results based on the hydrostatic theory. From the experimental results, it was found that the ventilation rate is exponentially proportional to ΔT and the area ratio (AR) of the inlet opening to the outlet opening is an important factor to affect natural ventilation. However, the influence on a ventilation rate by AR nearly disappeared when AR exceeds over 5.0. In addition to it, it was identified that AR and a flow resistance coefficient of Cd for ventilation can be correlated as an exponential function and its form is exp(−3.6AR). |
| doi_str_mv | 10.1016/j.enbuild.2018.07.046 |
| format | Article |
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Generally, natural ventilation is rarely caused by one effect alone, but by the coupled form of two effects. However, only the indoor-outdoor temperature difference (ΔT) was considered to evaluate the characteristic of thermal buoyancy-induced natural ventilation in this experimental study. The indoor-outdoor temperature differences were set to 5, 10, 20 and 30 °C. The measured ventilation rates by changing ΔT were compared to the calculation results based on the hydrostatic theory. From the experimental results, it was found that the ventilation rate is exponentially proportional to ΔT and the area ratio (AR) of the inlet opening to the outlet opening is an important factor to affect natural ventilation. However, the influence on a ventilation rate by AR nearly disappeared when AR exceeds over 5.0. In addition to it, it was identified that AR and a flow resistance coefficient of Cd for ventilation can be correlated as an exponential function and its form is exp(−3.6AR).</description><identifier>ISSN: 0378-7788</identifier><identifier>EISSN: 1872-6178</identifier><identifier>DOI: 10.1016/j.enbuild.2018.07.046</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Area ratio ; Buoyancy ; Exponential functions ; Flow resistance ; Indoor air quality ; Indoor-outdoor temperature difference ; Outdoor air quality ; Temperature ; Temperature effects ; Temperature gradients ; Thermal buoyancy induced natural ventilation ; Ventilation ; Wind induced natural ventilation ; Wind speed</subject><ispartof>Energy and buildings, 2018-10, Vol.177, p.1-11</ispartof><rights>2018 Elsevier B.V.</rights><rights>Copyright Elsevier BV Oct 15, 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-ac576581fe81df6f5dde2e393dd39c080f7d9acdf9f08c3de5d8465d1576f7e73</citedby><cites>FETCH-LOGICAL-c337t-ac576581fe81df6f5dde2e393dd39c080f7d9acdf9f08c3de5d8465d1576f7e73</cites><orcidid>0000-0003-2640-2385</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.enbuild.2018.07.046$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Han, Dong-Hun</creatorcontrib><creatorcontrib>Kim, Sedong</creatorcontrib><creatorcontrib>Choi, Jae Hyuk</creatorcontrib><creatorcontrib>Kim, Yeong Sik</creatorcontrib><creatorcontrib>Chung, HanShik</creatorcontrib><creatorcontrib>Jeong, Hyomin</creatorcontrib><creatorcontrib>Watjanatepin, Napat</creatorcontrib><creatorcontrib>Ruangpattanawiwat, Chalermpol</creatorcontrib><creatorcontrib>Choi, Soon-Ho</creatorcontrib><title>Experimental study on thermal buoyancy-induced natural ventilation</title><title>Energy and buildings</title><description>It is well known that natural ventilation is caused by the outdoor wind velocity and the indoor-outdoor temperature difference. Generally, natural ventilation is rarely caused by one effect alone, but by the coupled form of two effects. However, only the indoor-outdoor temperature difference (ΔT) was considered to evaluate the characteristic of thermal buoyancy-induced natural ventilation in this experimental study. The indoor-outdoor temperature differences were set to 5, 10, 20 and 30 °C. The measured ventilation rates by changing ΔT were compared to the calculation results based on the hydrostatic theory. From the experimental results, it was found that the ventilation rate is exponentially proportional to ΔT and the area ratio (AR) of the inlet opening to the outlet opening is an important factor to affect natural ventilation. However, the influence on a ventilation rate by AR nearly disappeared when AR exceeds over 5.0. In addition to it, it was identified that AR and a flow resistance coefficient of Cd for ventilation can be correlated as an exponential function and its form is exp(−3.6AR).</description><subject>Area ratio</subject><subject>Buoyancy</subject><subject>Exponential functions</subject><subject>Flow resistance</subject><subject>Indoor air quality</subject><subject>Indoor-outdoor temperature difference</subject><subject>Outdoor air quality</subject><subject>Temperature</subject><subject>Temperature effects</subject><subject>Temperature gradients</subject><subject>Thermal buoyancy induced natural ventilation</subject><subject>Ventilation</subject><subject>Wind induced natural ventilation</subject><subject>Wind speed</subject><issn>0378-7788</issn><issn>1872-6178</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkEFLAzEQhYMoWKs_QVjwvGuyaTbZk2hpVSh40XNIkwlm2WZrki3uvzelvXsamHnvDe9D6J7gimDSPHYV-O3oelPVmIgK8wovmgs0I4LXZUO4uEQzTLkoORfiGt3E2GGMG8bJDL2sfvcQ3A58Un0R02imYvBF-oawy4vtOEzK66l03owaTOFVGkM-HLLB9Sq5wd-iK6v6CHfnOUdf69Xn8q3cfLy-L583paaUp1JpxhsmiAVBjG0sMwZqoC01hrYaC2y5aZU2trVYaGqAGbFomCHZZjlwOkcPp9x9GH5GiEl2wxh8filrUvNFzSg5qthJpcMQYwAr97meCpMkWB5xyU6ecckjLom5zLiy7-nkg1zh4CDIqB343NkF0Emawf2T8AcMI3er</recordid><startdate>20181015</startdate><enddate>20181015</enddate><creator>Han, Dong-Hun</creator><creator>Kim, Sedong</creator><creator>Choi, Jae Hyuk</creator><creator>Kim, Yeong Sik</creator><creator>Chung, HanShik</creator><creator>Jeong, Hyomin</creator><creator>Watjanatepin, Napat</creator><creator>Ruangpattanawiwat, Chalermpol</creator><creator>Choi, Soon-Ho</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>KR7</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0003-2640-2385</orcidid></search><sort><creationdate>20181015</creationdate><title>Experimental study on thermal buoyancy-induced natural ventilation</title><author>Han, Dong-Hun ; Kim, Sedong ; Choi, Jae Hyuk ; Kim, Yeong Sik ; Chung, HanShik ; Jeong, Hyomin ; Watjanatepin, Napat ; Ruangpattanawiwat, Chalermpol ; Choi, Soon-Ho</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c337t-ac576581fe81df6f5dde2e393dd39c080f7d9acdf9f08c3de5d8465d1576f7e73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Area ratio</topic><topic>Buoyancy</topic><topic>Exponential functions</topic><topic>Flow resistance</topic><topic>Indoor air quality</topic><topic>Indoor-outdoor temperature difference</topic><topic>Outdoor air quality</topic><topic>Temperature</topic><topic>Temperature effects</topic><topic>Temperature gradients</topic><topic>Thermal buoyancy induced natural ventilation</topic><topic>Ventilation</topic><topic>Wind induced natural ventilation</topic><topic>Wind speed</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Han, Dong-Hun</creatorcontrib><creatorcontrib>Kim, Sedong</creatorcontrib><creatorcontrib>Choi, Jae Hyuk</creatorcontrib><creatorcontrib>Kim, Yeong Sik</creatorcontrib><creatorcontrib>Chung, HanShik</creatorcontrib><creatorcontrib>Jeong, Hyomin</creatorcontrib><creatorcontrib>Watjanatepin, Napat</creatorcontrib><creatorcontrib>Ruangpattanawiwat, Chalermpol</creatorcontrib><creatorcontrib>Choi, Soon-Ho</creatorcontrib><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Energy and buildings</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Han, Dong-Hun</au><au>Kim, Sedong</au><au>Choi, Jae Hyuk</au><au>Kim, Yeong Sik</au><au>Chung, HanShik</au><au>Jeong, Hyomin</au><au>Watjanatepin, Napat</au><au>Ruangpattanawiwat, Chalermpol</au><au>Choi, Soon-Ho</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Experimental study on thermal buoyancy-induced natural ventilation</atitle><jtitle>Energy and buildings</jtitle><date>2018-10-15</date><risdate>2018</risdate><volume>177</volume><spage>1</spage><epage>11</epage><pages>1-11</pages><issn>0378-7788</issn><eissn>1872-6178</eissn><abstract>It is well known that natural ventilation is caused by the outdoor wind velocity and the indoor-outdoor temperature difference. Generally, natural ventilation is rarely caused by one effect alone, but by the coupled form of two effects. However, only the indoor-outdoor temperature difference (ΔT) was considered to evaluate the characteristic of thermal buoyancy-induced natural ventilation in this experimental study. The indoor-outdoor temperature differences were set to 5, 10, 20 and 30 °C. The measured ventilation rates by changing ΔT were compared to the calculation results based on the hydrostatic theory. From the experimental results, it was found that the ventilation rate is exponentially proportional to ΔT and the area ratio (AR) of the inlet opening to the outlet opening is an important factor to affect natural ventilation. However, the influence on a ventilation rate by AR nearly disappeared when AR exceeds over 5.0. In addition to it, it was identified that AR and a flow resistance coefficient of Cd for ventilation can be correlated as an exponential function and its form is exp(−3.6AR).</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.enbuild.2018.07.046</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0003-2640-2385</orcidid></addata></record> |
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| subjects | Area ratio Buoyancy Exponential functions Flow resistance Indoor air quality Indoor-outdoor temperature difference Outdoor air quality Temperature Temperature effects Temperature gradients Thermal buoyancy induced natural ventilation Ventilation Wind induced natural ventilation Wind speed |
| title | Experimental study on thermal buoyancy-induced natural ventilation |
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