The Experts below are selected from a list of 24036 Experts worldwide ranked by ideXlab platform
Miaomiao He - One of the best experts on this subject based on the ideXlab platform.
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thermal performance of natural airflow window in subtropical and Temperate Climate zones a comparative study
Energy Conversion and Management, 2009Co-Authors: T T Chow, K F Fong, L S Chan, Miaomiao HeAbstract:Airflow window is highly useful in conserving building energy, and lessens the comfort problems caused by glazing. In this study, the thermal performance of a natural airflow window was examined through the use of a dynamic model, developed based on the integrated energy balance and airflow networks. The validity of the model was first tested by measured data obtained from a prototype installed at an environmental chamber. The application in the subtropical and Temperate Climate zones were then examined with the typical weather data of Hong Kong and Beijing. The findings confirmed that the natural airflow window can achieve substantial energy saving in both cities, and the reversible window frame is only required for Beijing, a location with hot summer and cold winter. The space cooling load via fenestration in Hong Kong, a subtropical city, can be reduced to 60% of the commonly used single absorptive glazing. In Beijing, as an example of the Temperate Climate, this can be reduced to 75% of the commonly used double glazing configuration in the summer period, and the space heat gain can be improved by 46% in the winter period.
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Thermal performance of natural airflow window in subtropical and Temperate Climate zones – A comparative study
Energy Conversion and Management, 2009Co-Authors: T T Chow, K F Fong, L S Chan, Miaomiao HeAbstract:Airflow window is highly useful in conserving building energy, and lessens the comfort problems caused by glazing. In this study, the thermal performance of a natural airflow window was examined through the use of a dynamic model, developed based on the integrated energy balance and airflow networks. The validity of the model was first tested by measured data obtained from a prototype installed at an environmental chamber. The application in the subtropical and Temperate Climate zones were then examined with the typical weather data of Hong Kong and Beijing. The findings confirmed that the natural airflow window can achieve substantial energy saving in both cities, and the reversible window frame is only required for Beijing, a location with hot summer and cold winter. The space cooling load via fenestration in Hong Kong, a subtropical city, can be reduced to 60% of the commonly used single absorptive glazing. In Beijing, as an example of the Temperate Climate, this can be reduced to 75% of the commonly used double glazing configuration in the summer period, and the space heat gain can be improved by 46% in the winter period.
Simone Bastianoni - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation on the energy performance of living walls in a Temperate Climate
Building and Environment, 2013Co-Authors: Ugo Mazzali, Piercarlo Romagnoni, Riccardo Maria Pulselli, Fabio Peron, Simone BastianoniAbstract:Abstract Living Walls, a type of vertical greenery system, are relatively light structures for architectural green cladding. They embed a thick curtain of plants nurtured by an automated watering system. Three Living Wall field tests are presented for investigating potential effects of the energy behavior on building envelopes. In particular, Living Walls were monitored in a Mediterranean Temperate Climate context at the latitudes of Northern and Central Italy. As a result, the dependence on the solar radiation forcing came out clearly. During sunny days, difference in temperature (monitored on the external surface) between the bare wall and the covered wall ranges from a minimum of 12 °C (case C) to a maximum of 20 °C (case A). The analysis was extended also to heat flux. The incoming (positive) heat flux through the bare wall was found to be higher compared to the Living Wall. Considering an overall thermal balance during the monitoring period, the outgoing heat flux through the Living Wall was higher. These results indicate that the use of green architectural cladding can significantly contribute to cooling energy reduction and offer a valuable solution for retrofitting existing buildings.
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Experimental investigation on the energy performance of Living Walls in a Temperate Climate
Building and Environment, 2013Co-Authors: Ugo Mazzali, Piercarlo Romagnoni, Riccardo Maria Pulselli, Fabio Peron, Simone BastianoniAbstract:Living Walls, a type of vertical greenery system, are relatively light structures for architectural green cladding. They embed a thick curtain of plants nurtured by an automated watering system. Three Living Wall field tests are presented for investigating potential effects of the energy behavior on building envelopes. In particular, Living Walls were monitored in a Mediterranean Temperate Climate context at the latitudes of Northern and Central Italy.As a result, the dependence on the solar radiation forcing came out clearly. During sunny days, difference in temperature (monitored on the external surface) between the bare wall and the covered wall ranges from a minimum of 12°C (case C) to a maximum of 20°C (case A). The analysis was extended also to heat flux. The incoming (positive) heat flux through the bare wall was found to be higher compared to the Living Wall. Considering an overall thermal balance during the monitoring period, the outgoing heat flux through the Living Wall was higher. These results indicate that the use of green architectural cladding can significantly contribute to cooling energy reduction and offer a valuable solution for retrofitting existing buildings. © 2013 Elsevier Ltd.
A Pascal - One of the best experts on this subject based on the ideXlab platform.
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lamination of swampy rivulets rivularia haematites stromatolites in a Temperate Climate
Sedimentary Geology, 2001Co-Authors: Christiane Caudwell, Jacques Lang, A PascalAbstract:Abstract Swampy-rivulets Rivularia haematites (D.C.) Agardh stromatolites were collected from the same site on the Plateau de Langres (Chaugey, France) over a seven year period. Specimens were studied in thin sections, in culture media under varying conditions of temperature and illumination, and by scanning electron microscope (SEM) in order to investigate the processes of calcification and lamination. New SEM observations confirm the polycrystalline structure of the ‘lamellae’ reported by the authors and show that the crystals composing these lamellae are elongate and aligned in the same direction as the filaments linked by them. The lamellae were also isolated in transverse sections under SEM and found to correspond to what under the light microscope appear to be ‘honeycomb’ structures. The diameter of alveoli can be the same as that of a ‘false branching’; their walls, formed by the outer sheath, have a dense network of microfibrils. These observations confirm the formation of calcitic lamellae at the false branching points and in contact with the microfibrils of the outer sheath. Confirmation of earlier hypotheses was sought through observation in thin section of the stromatolites collected over seven years. Micritic dark laminae are thought to form in three stages: (i) formation of a dark lamina by formation of a false branching zone in the wet season, (ii) initial calcification in this zone as microsparitic and sparitic lamellae during even a short dry spell, and (iii) subsequent bacterial micritization of the lamellae during an extended warm, dry season. The sparitic light laminae form around the hair-bearing regions. Lamination was first considered with regard to the annual radial growth rate of R. haematites. The thin section may display either a single dark lamina for two years’ growth, or a dark lamina thicker than the annual growth rate. Examination of local meteorological data accounts for the first phenomenon by a wet spell of more than 13 months and the second by a warm, dry period of one month. It may therefore take several years for a couplet to form as growth of the cyanobacterial colony is influenced by climatic variations. The different calcification phenomena were also correlated with dry spells. These interpretations are consistent with results obtained by experiments.
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biocoenosis and induration of freshwater rivularia stromatolites in a Temperate Climate
Geomicrobiology Journal, 1997Co-Authors: Christiane Caudwell, A Delcourt, Jacques Lang, A PascalAbstract:Freshwater Rivularia haematites (D.C.) Agardh and Rivularia biasolettiana Menegh‐ini stromatolites were collected from the Plateau de Langres and Lac d'Annecy (France) and investigated experimentally. In addition to cyanobacteria, the community of organisms consists of Desmococcus (green algae) and many bacteria including Agrobacterium tumefaciens and Pseudomonas diminuta for Rivularia haematites, and Achromobacter group B and Pseudomonas acidovorans for Rivularia biasolettiana. Stromatolite induration is not confined to calcification and may locally exhibit apatite or gypsum crystals, with the latter appearing only in cultures exposed to light. The effect of certain microorganisms of the biocoenosis on induration is considered. Desmococcus inhibits the formation of sparite or microsparile in contact with Rivu‐laria filaments by making them longer and thinner. Photosynthesis by Rivularia probably produces the sugars required for the development of Achromobacter group B and Agrobacterium tumefaciens. These...
T T Chow - One of the best experts on this subject based on the ideXlab platform.
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thermal performance of natural airflow window in subtropical and Temperate Climate zones a comparative study
Energy Conversion and Management, 2009Co-Authors: T T Chow, K F Fong, L S Chan, Miaomiao HeAbstract:Airflow window is highly useful in conserving building energy, and lessens the comfort problems caused by glazing. In this study, the thermal performance of a natural airflow window was examined through the use of a dynamic model, developed based on the integrated energy balance and airflow networks. The validity of the model was first tested by measured data obtained from a prototype installed at an environmental chamber. The application in the subtropical and Temperate Climate zones were then examined with the typical weather data of Hong Kong and Beijing. The findings confirmed that the natural airflow window can achieve substantial energy saving in both cities, and the reversible window frame is only required for Beijing, a location with hot summer and cold winter. The space cooling load via fenestration in Hong Kong, a subtropical city, can be reduced to 60% of the commonly used single absorptive glazing. In Beijing, as an example of the Temperate Climate, this can be reduced to 75% of the commonly used double glazing configuration in the summer period, and the space heat gain can be improved by 46% in the winter period.
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Thermal performance of natural airflow window in subtropical and Temperate Climate zones – A comparative study
Energy Conversion and Management, 2009Co-Authors: T T Chow, K F Fong, L S Chan, Miaomiao HeAbstract:Airflow window is highly useful in conserving building energy, and lessens the comfort problems caused by glazing. In this study, the thermal performance of a natural airflow window was examined through the use of a dynamic model, developed based on the integrated energy balance and airflow networks. The validity of the model was first tested by measured data obtained from a prototype installed at an environmental chamber. The application in the subtropical and Temperate Climate zones were then examined with the typical weather data of Hong Kong and Beijing. The findings confirmed that the natural airflow window can achieve substantial energy saving in both cities, and the reversible window frame is only required for Beijing, a location with hot summer and cold winter. The space cooling load via fenestration in Hong Kong, a subtropical city, can be reduced to 60% of the commonly used single absorptive glazing. In Beijing, as an example of the Temperate Climate, this can be reduced to 75% of the commonly used double glazing configuration in the summer period, and the space heat gain can be improved by 46% in the winter period.
E Di Giuseppe - One of the best experts on this subject based on the ideXlab platform.
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green roof yearly performance a case study in a highly insulated building under Temperate Climate
Energy and Buildings, 2012Co-Authors: Marco Dorazio, C Di Perna, E Di GiuseppeAbstract:Abstract The research deals with the experimental assessment of the yearly thermal performance of a green roof compared to other passive cooling technologies under Temperate Climate. All roofs are installed on highly insulated slabs (U-value
