Application of passive cooling systems in the hot and humid climate: The case study of solar chimney and wetted roof in Thailand

Chungloo, Sudaporn; Limmeechokchai, Bundit

doi:10.1016/j.buildenv.2006.08.030

Cited by 94 publications

(32 citation statements)

References 10 publications

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“…Furthermore, under the tropical weather conditions of high solar irradiance and low ambient air speed, cross ventilation performs better than a solar chimney which is recommended under a zero ambient air speed. At high ambient temperatures and high solar intensity in the daytime, the solar chimney can reduce the indoor temperature by 1.0-3.5°C compared to the ambient air of 32.0-40.0°C (Chungloo & Limmeechokchai, 2007). In addition, the velocity magnitude can be increased to 4-25% (Kasaeian, Ghalamchi, & Ghalamchi, 2014).…”

Section: Research Theory and Methodsmentioning

confidence: 99%

Sustainable design of past-rural architecture in the present urban-tropical environment

Samodra

2017

IJPS

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With large open space, traditional houses as representative of rural architecture, have been designed in the past in sufficient air flow. However, nowadays, they fight to accommodate unsupportive environment; high density neighborhoods and global warming effect. This research studies adaptation method and concept of sustainable design of the rural architecture in urban environment of tropical climate. Simultaneous direct measurement and occupant interview were conducted on 19 buildings and 71 respondents. Ecotect Analysis and CFD Fluent program were also used to obtain the proposed model. The results highlighted that by active and passive ventilation method, the occupants respond their urban environment. Moreover, the sustainable design can be reached by raising the floor and roof in order to give higher potency of cooler sufficient air movement through openings and shading. Providing solar chimney as vertical ventilation with sufficient ceiling fan works is also proposed.

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Section: Research Theory and Methodsmentioning

confidence: 99%

Sustainable design of past-rural architecture in the present urban-tropical environment

Samodra

2017

IJPS

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“…Hence, the volume flow rate of air decreases all day since the volume flow rate of the buoyancy driven system depends on the temperature differences. Therefore, the application of a solar chimney in the hot and humid climate needs pre-cooled inlet air 9 or a modification of the bioclimatic roof 10 to improve the temperature differences especially during the afternoon hours.…”

Section: Discussionmentioning

confidence: 99%

“…where the value of C D , coefficient of discharge, in this study is 0.4 9 . The Reynolds number is calculated from…”

Section: The Data Analysismentioning

confidence: 99%

Untitled

Chungloo¹,

Limmeechokchai²

2009

ScienceAsia

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ABSTRACT:A solar chimney is a hot air channel attached to the roof. It enhances natural ventilation for buildings by employing the temperature difference of air at the inlet and the outlet of the channel. Experiments were carried out in an open-ended air gap, situated between the corrugated roof tile and the gypsum board, with the tilt angle of 45°of the testing building. The results showed a reduction of temperature differences between the inlet and outlet of the solar chimney for all of the daytime, implying a decrease of volume flow rate of air in the system. The hot-surface, inlet air, and outlet air temperatures were observed to increase during 8:00-12:00 and they decreased rapidly during 13:00-17:00. We obtained an empirical equation relating the Nusselt number, Rayleigh number, and the dimensions and angles of the roof. Because the equation is derived from the field experiment under the hot and humid climate, it could be used for the determination of the mean convection heat transfer coefficient of a roof solar chimney with a similar geometry.

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“…It was found that the combined solar induced ventilation was able to reduce room temperature by about 4e5 C lower than the other configuration. The application of solar induced ventilation with other passive cooling strategies in the hot and humid climate was examined by [6,13] and [14]. Bansal et al [6] developed a combination of roof solar collector and wind tower.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of stack ventilation in hot and humid climate using a combination of roof solar collector and vertical stack

Yusoff

Salleh

Adam

et al. 2010

Building and Environment

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a b s t r a c tIn the hot and humid climate, stack ventilation is inefficient due to small temperature difference between the inside and outside of naturally ventilated buildings. Hence, solar induced ventilation is a feasible alternative in enhancing the stack ventilation. This paper aims to investigate the effectiveness of a proposed solar induced ventilation strategy, which combines a roof solar collector and a vertical stack, in enhancing the stack ventilation performance in the hot and humid climate. The methodology selected for the investigation is physical experimental modelling which was carried out in the actual environment. The results are presented and discussed in terms of two performance variables: air temperature and air velocity. The findings indicate that the proposed strategy is able to enhance the stack ventilation, both in semi-clear sky and overcast sky conditions. The highest air temperature difference between the air inside the stack and the ambient air (T i ÀT o ) is achieved in the semi-clear sky condition, which is about 9.9 C (45.8 Ce35.9 C). Meanwhile, in the overcast sky condition, the highest air temperature difference (T i ÀT o ) is 6.2 C (39.3 Ce33.1 C). The experimental results also indicate good agreement with the theoretical results for the glass temperature, the air temperature in the roof solar collector's channel and the absorber temperature. The findings also show that wind has significant effect to the induced air velocity by the proposed strategy.

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Application of passive cooling systems in the hot and humid climate: The case study of solar chimney and wetted roof in Thailand

Cited by 94 publications

References 10 publications

Sustainable design of past-rural architecture in the present urban-tropical environment

Sustainable design of past-rural architecture in the present urban-tropical environment

Untitled

Enhancement of stack ventilation in hot and humid climate using a combination of roof solar collector and vertical stack

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