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3.2.4 Sunlight Hours Analysis
3.2.4 Sunlight Hours Analysis
Sunlight hour analysis calculates the number of hours of direct solar exposure received by input geometry using sun vectors from the Sun Path component. This component can be used to evaluate the number of hours of sunlight received by vegetation in a park or the hours where direct sunlight might make a certain outdoor space comfortable or uncomfortable.
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For the purpose of this exercise it is strongly suggested to use tools like ladybug available in grasshopper as a plug in to have a parametric control. Ladybug imports standard Energy Plus weather files (.EWP) into Grasshopper and provides variety of 3D interactive graphics to aid the design-making process during initial stages of design.
The weather data used for the purpose of this study are approved source by the World Meteorological Intergovernmental Organization.
It takes inputs like north, geometry, context grid size, orientation, time giving larger parameter control over the final output that is color chart of number of sunlight hours.
Figure 3-6 Sunlight hour analysis (Sampreet Dasgupta - 4th year B.Arch)
Evaluation Criteria Selection – Ground Exposure (Plaza)
Existing Plaza Exposure
Existing big plaza Existing small plazas
Existing -
Area of plaza (combined) : 308.43m2 Plaza exposure : Small plaza get sunlight of about 97hrs and below. Bigger plaza has 35% plaza with sunlight for 146- 219hrs whereas rest 65% part gets sunlight for 97-24hrs. FAR : 5.7 POP : 857 Open space : 36% Total built-up area : 64% Social Gathering is an important activity for the population hence they have plazas within the clusters so that people can gather and spend time. Months for analysis : 1
Time chosen for analysis : 12pm to 4pm
Total number of hours : 244 hours Existing big plaza is gets sunlight for more than 146hrs in its 30% part. Whereas small plazas get sunlight of about 97 So creating many small plazas rather than one big plaza by arrangement of building blocks communal interaction.
Target -
Plaza exposure : 50% part of ground should get sunlight for 73hrs or less then that. Sunlight should not rise above 122hrs. FAR : 4.7 to 5.3 POP : around 1200
