Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Sun, shade and natural daylight in South African town planning, with emphasis on Pretoria
A bioclimatic analysis of different South African towns and cities indicates that,if the correct mix of passive design principles is used, they all have a significantpassive design potential. Of all such measures, solar protection and shading isthe single most important passive design measure to reduce energy usage andto improve internal comfort for buildings in all South African climatic regions.The correct design of public open spaces and streets facilitates, to a greatextent, energy-efficient buildings, whilst at the same time providing functionaland comfortable urban open spaces and streets. Passive solar buildings aim tomaintain interior thermal comfort throughout the sun’s diurnal and annual cycles,whilst reducing the requirement for active heating and cooling systems. The aim ofthis article is to investigate the effect of climate zones on passive design potential,of which shading design is an integral part, using Pretoria as a case study. Thisincludes the effect of street width, building height, street layout, orientation, andthe amount of sunlight available for trees and plants in the urban environment.The Spatial Planning and Land Management Act (2013), City of Tshwane LandUse Management By-law (2016) and the Tshwane Town-Planning Scheme 2008(Revised 2014) were used as regulatory framework. To support the research, anEarly Design Phase (EDP) experimental research platform was used to investigatethe amount of sunlight on building facades with different orientations. This methodenables the calculation of shading angles where there is a balance between thehot periods (requiring cooling) and cool periods (requiring heating) from the urbanand building perspective. This has been achieved by means of the developmentof analytical software that uses weather files as one of the inputs to calculatecritical solar angles. Over and above the calculation of current building solarprotection angles, this method also facilitates the calculation of the increase insolar protection that will be required with climate change such as with the expectedA2 climate change scenario (business-as-usual scenario) for South Africa. Tosupport the EDP analysis, detailed simulations were also undertaken by meansof Ecotect v5.60.
Sun, shade and natural daylight in South African town planning, with emphasis on Pretoria
A bioclimatic analysis of different South African towns and cities indicates that,if the correct mix of passive design principles is used, they all have a significantpassive design potential. Of all such measures, solar protection and shading isthe single most important passive design measure to reduce energy usage andto improve internal comfort for buildings in all South African climatic regions.The correct design of public open spaces and streets facilitates, to a greatextent, energy-efficient buildings, whilst at the same time providing functionaland comfortable urban open spaces and streets. Passive solar buildings aim tomaintain interior thermal comfort throughout the sun’s diurnal and annual cycles,whilst reducing the requirement for active heating and cooling systems. The aim ofthis article is to investigate the effect of climate zones on passive design potential,of which shading design is an integral part, using Pretoria as a case study. Thisincludes the effect of street width, building height, street layout, orientation, andthe amount of sunlight available for trees and plants in the urban environment.The Spatial Planning and Land Management Act (2013), City of Tshwane LandUse Management By-law (2016) and the Tshwane Town-Planning Scheme 2008(Revised 2014) were used as regulatory framework. To support the research, anEarly Design Phase (EDP) experimental research platform was used to investigatethe amount of sunlight on building facades with different orientations. This methodenables the calculation of shading angles where there is a balance between thehot periods (requiring cooling) and cool periods (requiring heating) from the urbanand building perspective. This has been achieved by means of the developmentof analytical software that uses weather files as one of the inputs to calculatecritical solar angles. Over and above the calculation of current building solarprotection angles, this method also facilitates the calculation of the increase insolar protection that will be required with climate change such as with the expectedA2 climate change scenario (business-as-usual scenario) for South Africa. Tosupport the EDP analysis, detailed simulations were also undertaken by meansof Ecotect v5.60.
Sun, shade and natural daylight in South African town planning, with emphasis on Pretoria
Conradie, Dirk (Autor:in)
31.12.2018
Town and Regional Planning; Vol. 73 (2018); 47-67 ; 2415-0495 ; 1012-280X
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
climate change , South Africa , natural daylight , shade , sun , Cities
DDC:
720
Sun, shade and natural daylight in South African town planning, with emphasis on Pretoria
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