An investigation into thermal comfort in the summer season of Ghadames, Libya

Ealiwa, M.A.; Taki, A. H.; Howarth, A; Seden, M.R

doi:10.1016/s0360-1323(99)00071-2

Cited by 77 publications

(47 citation statements)

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“…In naturally ventilated buildings, occupants may accept higher temperatures than in air-conditioned buildings, and natural wind with a relatively high average velocity is more acceptable than mechanical wind (Busch, 1992;Ealiwa et al, 2001;de Dear and Brager, 2002). The occupants of naturally ventilated buildings accept a significantly wider range of temperatures (Busch, 1992;Ealiwa et al, 2001;de Dear and Brager (2002)) that fall out of the standard based on Fanger's thermal comfort model (ISO 7730, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…The occupants of naturally ventilated buildings accept a significantly wider range of temperatures (Busch, 1992;Ealiwa et al, 2001;de Dear and Brager (2002)) that fall out of the standard based on Fanger's thermal comfort model (ISO 7730, 2005). Busch (1992) carried out a field study of thermal comfort in Bangkok, where more than 1,100 office workers responded to a questionnaire while simultaneous physical measurements were taken.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the upper temperature bound for a Thai comfort standard, instead of the currently accepted level of 26.1 1C, should be as high as 31 1C for office workers who are accustomed to naturally ventilated spaces, and as high as 28 1C for those who are accustomed to airconditioning. Ealiwa et al (2001) conducted a field survey of thermal comfort within two types of buildings in Ghadames, an oasis town in Libya, with 24 old buildings that employ natural ventilation systems with courtyards and 27 new buildings that employ air-conditioning systems. Regarding the overall feeling in the summer season, the occupants reported that they are more satisfied and thermally neutral in the old, naturally ventilated buildings than in the new, air-conditioned buildings.…”

Section: Introductionmentioning

confidence: 99%

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Correlations in thermal comfort and natural wind

Kang

Song

Schiavon

2013

Journal of Thermal Biology

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a b s t r a c tMany field surveys have shown that naturally ventilated buildings are favorable to human thermal comfort and may allow higher cooling temperatures than air-conditioned buildings. Recreating natural wind characteristics with a mechanical cooling system may diminish the drawbacks of conventional cooling systems such as drafts and high energy demands.Natural wind characteristics (wind velocity, direction, turbulent intensity, temperature and relative humidity) were recorded in a mountain environment and correlated with the human thermal sensation of 48 subjects. Natural wind fluctuation characteristics were analyzed using the Fast Fourier Transform (FFT) analysis. The dynamic characteristics of natural wind were averaged through the power spectrum exponent (β−value), which represents the energy distribution of the turbulent flow of natural wind. The power spectrum exponent (β−value) of the natural wind will decrease when the mean velocity increases, while it will increase when the turbulent intensity increases. The power spectrum exponent (β−value) was correlated (Spearman's rank coefficient¼ 0.56, po0.001) with thermal comfort. The power spectrum exponent (β-value) for people feeling comfortable has a median value of 1.62 [1.41-1.80 for the first and third quartiles, respectively] and the β−value for people feeling uncomfortable has a median value of 1.10 [0.97-1.25].

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlations in thermal comfort and natural wind

Kang

Song

Schiavon

2013

Journal of Thermal Biology

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“…Research results about the environmental conditions and thermal comfort within two types of buildings, old (traditional) and new (contemporary), conducted in Ghadames oasis in Libya, showed that people have an overall impression of higher standard of thermal comfort in old buildings than in new ones [20], almost the same as research about the possibilities for improvements in the design of new houses to conserve energy and enhance indoor thermal comfort in comparison to the old and traditional one using the importance of architectural features responsible for difference in the thermal performance [21]. There is also important research about influences of urban structure to the thermal comfort in desert cities [22] that confirms the vertical street profile is of prime importance in the resulting thermal sensation, as well as building materials that were also found to play a decisive role.…”

Section: Research Objectivesmentioning

confidence: 99%

Thermal comfort, adaptability and sustainability of vernacular single family houses in Libya

2017

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Preliminary communicationTraditional and vernacular housing was developed in close relation between the functional needs of the occupants, the culture, climate, and other aspects of the living and built environment. Over the course of the last decades, most developing countries, including Libya, have experienced a rapid economic growth and increase in population, leading to the increase in construction of contemporary single family houses influenced by western models. The paper analyses aspects of thermal comfort in traditional single family houses in mountain (city of Gharyan) and desert regions (old city of Ghadames) in Libya with an aim to investigate advantages of the vernacular concepts in contemporary design. The study will establish valorisation criteria by researching structures, materials, internal arrangement, roof, openings and other aspects that influence sustainability. The results will be used in the fields of architecture, urban design and building industry in Libya, since the knowledge of traditional concepts and elements sustained through a long period of time will be valuable in building healthy homes and saving non-renewable energy in contemporary structures.

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“…dry bulb temperature, mean radiant temperature, relative humidity and air velocity) and two personal (clothing-insulation and physical activity) parameters [5]. The thermal comfort standard prescribed by ISO 7730 was the first to have been used on a worldwide basis [6]. It's based on Fanger's work in climate chamber experiments using young Danish students and eventually the PMV model.…”

mentioning

confidence: 99%