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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Arquiteturas de distribuição de ar em cabines de aeronaves: análise experimental de desconforto térmico local. / Air distribution architectures in aircraft cabins: experimental analysis of local thermal discomfort.

Silva, Evandro Souza da 18 October 2013 (has links)
O sistema de ventilação por mistura (MV), utilizado atualmente em cabines de aeronaves na distribuição do ar tratado, não tem propiciado condições adequadas de conforto térmico e pode, devido às suas características de mistura, propagar rapidamente doenças infecciosas na cabine. Sistemas de ventilação utilizados em ambientes de edificações, como o sistema de distribuição de ar por deslocamento (DV) e o sistema de distribuição de ar pelo piso (UFAD) e variantes destes sistemas, estão começando a ser propostos. Função disto, o presente trabalho comparou três arquiteturas de distribuição de ar: o sistema tradicional (MV), o sistema de insuflamento de ar pelo piso (UFAD) e uma variação do sistema UFAD, incluindo insuflamento lateral abaixo dos bagageiros, denominado de UFAD modificado. Os ensaios foram realizados em cabine de mock up de aeronave com 12 lugares, ocupados por manequins aquecidos simulando os passageiros, considerando duas temperaturas para o ar insuflado na cabine: 18°C e 22°C. Os resultados mostram influência significativa da temperatura de insuflamento do ar nas condições de desconforto térmico local, juntamente com resultados promissores para o sistema UFAD, com percentuais de desconforto devido às correntes de ar menores que 20%, com exceção da região de insuflamento do ar no corredor. / Mixing ventilation system (MV), currently used in aircraft cabins for treated air distribution, has not provided adequate conditions for thermal comfort and may, due to its mixing characteristics, spread quickly infectious diseases in the cabin. Ventilation systems used in buildings environments, such as displacement ventilation system (DV) and underfloor air distribution system (UFAD) and variants of these systems are beginning to be proposed. Due to that, the present study compared three air distribution architectures: the traditional system (MV), underfloor air distribution system (UFAD) and a variation of the UFAD system, including side air supply under bins, called UFAD modified. Tests were performed in aircraft cabin mock up with 12 seats, occupied by heated manikins simulating passengers, considering two air supply temperatures into the cabin: 18°C and 22°C. Results show significant influence of air supply temperature in conditions of local thermal discomfort, together with promising results for UFAD system, with percentages of discomfort due to draught less than 20%, except in the air insufflation area in aisle.
2

Arquiteturas de distribuição de ar em cabines de aeronaves: análise experimental de desconforto térmico local. / Air distribution architectures in aircraft cabins: experimental analysis of local thermal discomfort.

Evandro Souza da Silva 18 October 2013 (has links)
O sistema de ventilação por mistura (MV), utilizado atualmente em cabines de aeronaves na distribuição do ar tratado, não tem propiciado condições adequadas de conforto térmico e pode, devido às suas características de mistura, propagar rapidamente doenças infecciosas na cabine. Sistemas de ventilação utilizados em ambientes de edificações, como o sistema de distribuição de ar por deslocamento (DV) e o sistema de distribuição de ar pelo piso (UFAD) e variantes destes sistemas, estão começando a ser propostos. Função disto, o presente trabalho comparou três arquiteturas de distribuição de ar: o sistema tradicional (MV), o sistema de insuflamento de ar pelo piso (UFAD) e uma variação do sistema UFAD, incluindo insuflamento lateral abaixo dos bagageiros, denominado de UFAD modificado. Os ensaios foram realizados em cabine de mock up de aeronave com 12 lugares, ocupados por manequins aquecidos simulando os passageiros, considerando duas temperaturas para o ar insuflado na cabine: 18°C e 22°C. Os resultados mostram influência significativa da temperatura de insuflamento do ar nas condições de desconforto térmico local, juntamente com resultados promissores para o sistema UFAD, com percentuais de desconforto devido às correntes de ar menores que 20%, com exceção da região de insuflamento do ar no corredor. / Mixing ventilation system (MV), currently used in aircraft cabins for treated air distribution, has not provided adequate conditions for thermal comfort and may, due to its mixing characteristics, spread quickly infectious diseases in the cabin. Ventilation systems used in buildings environments, such as displacement ventilation system (DV) and underfloor air distribution system (UFAD) and variants of these systems are beginning to be proposed. Due to that, the present study compared three air distribution architectures: the traditional system (MV), underfloor air distribution system (UFAD) and a variation of the UFAD system, including side air supply under bins, called UFAD modified. Tests were performed in aircraft cabin mock up with 12 seats, occupied by heated manikins simulating passengers, considering two air supply temperatures into the cabin: 18°C and 22°C. Results show significant influence of air supply temperature in conditions of local thermal discomfort, together with promising results for UFAD system, with percentages of discomfort due to draught less than 20%, except in the air insufflation area in aisle.
3

Investigating The Relationship Between Mean Radiant Temperature (MRT) And Predicted Mean Vote (PMV) : A case study in a University building

Godbole, Swapnil January 2018 (has links)
Thermal comfort in an indoor environment is largely dependent on the four environmental and two personal parameters which is most commonly measured by the Predicted Mean Vote (PMV) model developed by Fanger. It has been studied that variations in these parameters beyond a range could lead to discomfort complaints. However, little research has been done on the effect of mean radiant temperature variations and its influence on predicted mean vote and thermal comfort specially in an actual building environment. This study aims to investigate the relationship between mean radiant temperature and predicted mean vote in indoor environment. Using the methods of on-site measurement of indoor environmental parameters and subjective votes on thermal sensation in an educational building; it was found that rise in mean radiant temperature lead to rise in PMV value and discomfort vote amongst occupants seated near glazed façade. A very strong positive correlation was found between mean radiant temperature and PMV near the window side of the room under warm and sunny weather conditions. Analysis of indoor environmental data from the several measurement sessions concluded that rise in mean radiant temperature and PMV was not noticed until there was a direct solar transmission through the window. It is advisable to use solar shading on windows, but special consideration should be given to the trade-offs between energy consumption (heating or cooling) and lighting energy consumption. No conclusions could be made in terms of ankle draft discomfort due to experimental limitations and more research would be required to investigate this phenomenon. / Termisk komfort inomhusmiljö är till stor del beroende av de fyra miljö och två personlig parametrar som oftast mäts av Predicted Mean Vote (PMV) modell som utvecklats av Fanger. Det har studerats att variationer i dessa parametrar utanför en limit kan leda till missnöjeklagomål. Däremot har lite forskning gjorts på effekten av mean radiant tempratur och dess inverkan på predicted mean vote och termisk komfort speciellt i en verklig byggnadsmiljö. Syftet med denna studie är att undersöka sambandet mellan mean radiant tempratur och predicted mean vote i inomhusmiljö. Användning mätmetoderna av inomhusmiljöparametrar och subjektiva röster av termisk komfort uppfattning i en byggnad för utbildning; det konstaterades att stiga i medel leda mean radiant tempratur att stiga i predicted mean vote värde och missnöje rösta bland byggnad brukarna sitter nära glasfasaden. En väldigt positiv korrelation mellan men radiant tempratur och predicted mean vote nära en fönstersida under varma och soliga väder var noterat. Genom att analysera data av inomhusmiljön från de multipla mätningssessionerna konkluderat att ökningen i mean radiant tempratur och predicted mean vote inte märktes tills det fanns en direkt soltransmission genom fönstret. Det är rekommenderar att använda solskydd på fönster, men med tanke på kompromisser mellan energiförbrukning (värme eller kyla) och ljussättning konsumtion.   Inga slutsatser kan göras om luftdrag på fotled grund av experimentella begränsningar och mer forskning skulle krävas för att undersöka detta fenomen.

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