The first step is to choose the location of interest.
Selecting the location helps to identify the associated adaptive climate zone. To know more about the adaptive climate zones of Kerala click on click here.
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Climate data analysis is an important topic and in the context of building design, knowledge of location specific climate data is needed in the design conceptualisation phase to analyse a buildings performance via simulation tools, or building performance simulation (BPS). For formulating and assessing energy policies, it is not feasible to do BPS for each location separately. Thus classification of climate zones plays an important role by helping to identify representative locations which can then be used for BPS.
The climate and environment in which buildings are located will influence their thermal behaviour and thus the final energy consumption (Reijenga and Brassier, 2017). The indoor comfort is greatly influenced by the outdoor weather conditions and the responsiveness of buildings to prevailing local climate plays an important role if the dual aspects of occupant comfort and low energy demand are to be met. Therefore a thorough knowledge of the local climatic parameters would help architects and building designers to analyse a building’s performance via simulation tools, or Building Performance Simulation (BPS) in the design conceptualisation phase and thereby design buildings that are sensitive to the local climate.
When new energy strategies/policies are formulated or assessed for their effectiveness, it is not feasible to do BPS for each and every location separately. Thus, it becomes necessary to classify climate zones and identify representative locations that can be used for these simulations. Thus classification of the climate into zones for building energy applications play a crucial role in aiding policy makers, architects and building designers to achieve energy efficiency (Walsh et al., 2017).
There exists many classification systems to define climate zones and their approaches classify the regions in India under different zones. Some of these classification systems are suitable only for some specific purposes. For example, the Köppen-Geiger system (first introduced around 1900) classifies India under tropical rainy climate. This classification system was introduced to understand the distribution of global vegetation cover (Köppen et al., 2011) and is not suitable for building energy analysis (Pernigotto and Gasparella, 2018).The National Building Code (NBC) of India (BIS, 2016) classifies the country into five major climatic zones.
Table shows the climate zones of Kerala as defined in the National Building Code of India.
This classification is based on the work done by Ali et al. (1993), in which mean monthly maximum temperature and humidity data from 225 stations were examined and then used to group the locations into zones depending on the prevalence of a defined climatic condition for six or more months in a year. The ASHRAE climate zone classification method defines the climate into different zones based on heating and cooling degree days and into sub-zones based on precipitation (Standard 169, 2013). Under this system, the zones in India were defined and delineated based on climate data from a combination of ground weather station (51 stations) and remote sensing data. These classification systems had examined the climate across India as a whole to define and group the regions into different zones. Many studies that examined the climate data across India, in different magnitudes, had highlighted the need for location-specific climate assessment to define and delineate the climate zones (Bansal and Minke, 1995; Singh et al., 2007; Pawar et al., 2015).
A previous study examined the climate data of 14 major cities in Kerala (Jayapalan Nair et al., 2018) and identi- fied the existence of locations with different climate characteristics, which was in contrast to the observations of the NBC of India and the ASHRAE climate classification system. The results of the study, corroborated in the governments Post Disaster Needs Assessment report (GoK, 2018), highlighted the urgent need for amendments in Kerala’s building codes to account for the local climatic variations in building designs. The climate of Kerala was examined at higher resolutions to classify and delineate zones with different climate characteristics. A new method based on adaptive thermal comfort model, for classification of climate zones is presented. This classification is designed for use in Kerala’s building code, design guidelines and building energy analyses.
Figure shows the adaptive climate zones of Kerala.
The regions in Kerala were delineated into three adaptive climate zones namely: Adaptively Hot Zone, Adaptively Mixed Zone and Adaptively Cold Zone. A method based on adaptive thermal comfort model, to classify the climate zones for building performance simulation and assessment purposes. This observation, i.e. the existence of regions in Kerala with different climatic characteristics, is in contrast to that of the existing climate classification systems like the ASHRAE and the NBC of India. The ASHRAE and the NBC of India’s climate classification system identify the regions in Kerala as belonging to a single zone.
To understand the appropriateness of different classification methods, the climate zones were re-defined and delineated based on the ASHRAE and the NBC of India classification method using climate data from locations distributed at 10km spacing across Kerala. The original resolution used by these classification systems to delineate the zones were much lower than the one used in this study. From the results of comparison, it was observed that, at higher resolution, these classification systems delineate the regions in Kerala into more than one climate zone. Thus the results highlight the importance of grid spacing for delineating climate zones. On comparing the climate zones delineated by the three climate classification methods, i.e. the adaptive, the ASHRAE and the NBC of India, it was observed that the ASHRAE and the NBC of India method were ineffective in appropriately defining the different climate zones in Kerala. The comparison was done by examining the thermal performance of a building, representative of Kerala’s building typology, across the different climate zones delineated by the three classification methods.
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The first step is to select the location of interest in Kerala. Kerala is one of the 29 States in India and is located in the south western part of the country between the Arabian sea and the mountain ranges - Western Ghats. The State of Kerala is divided into 14 administrative districts, which are further divided into corporations, municipalities, panchayaths and villages. In this guide each of the administrative bodies are assigned their respective Adaptive Climate Zone. By selecting the location, the designs tailored for their respective climate will be made available. To know how to select the location please watch the below video.
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