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Hajilooei H, Mollazadeh K, Maleki M. (2025). Analysis of Climatic Adaptability and Heating and Cooling Arrangements of Achaemenid Architecture (Case Study: Persepolis Complex). Parseh J Archaeol Stud. 9(32), 115-140. doi:10.22034/PJAS.855
URL: http://journal.richt.ir/mbp/article-1-855-en.html

Abstract
It is possible to study the climate adaptability of past and present architecture by benefiting from the sciences of archeology, architecture, geography, applied climatology and paleoclimatology. Conducting such studies in connection with the complex of Persepolis in Marvdasht plain belonging to the Achaemenid period adds new information to the scope of our knowledge of the architecture of the mentioned period. The current research seeks to evaluate three main questions: 1) What were the physical components of the architecture of Persepolis complex in order to adapt it to climatic conditions? 2) How effective were these components in line with the mentioned issue? And 3) What were the non-physical heating or cooling arrangements of the complex? The necessary information has been collected by library and field methods and analyzes of four software, AutoCAD, Climate Consultant, Ecotect, and DesignBuilder in the field of energy and architecture and processed in a descriptive-analytical way. The physical components of the architecture of the complex include its orientation towards the south with a northwest-southeast stretch, high density and height of buildings and the creation of passages with a small width, the use of mud-brick in the construction of walls and the creation of a flat covering of wooden beams, the installation of side doors and windows in the walls. South in most of the buildings are the construction of the pillared porch at the entrance of most of the buildings. These components are effective in using the radiant heat of the sun to heat the residents in some hours in the time range from October to April. However, the application of these solutions from November to March (1632 hours in total) is not enough, and heat production was needed. Probably, in order to achieve thermal comfort, the residents had time management in holding gatherings and used non-physical heating arrangements similar to portable open fire-place from the palaces of the Assyrian Empire. Finally, the climatic adaptability of the complex to the Marvdasht plain and the adoption of suitable heating and cooling measures in it have ensured the thermal comfort of the residents.
Keywords: Environmental Archeology, Persepolis Complex, Thermal Comfort in Achaemenid Architecture, Climatic Adaptability.

Introduction
Creating ecological stability between man-made and nature is necessary for the continuation of life. Architecture is one of the aspects of human life that has a direct relationship with climatic conditions. The formation of native architectural styles throughout history shows the extent of knowledge of the ethnic groups from the climatic conditions of the surrounding environment, which is based on the reading of the geographical, historical and social background of the region (Moazzen & Sad berenji, 1400: 168). When the climatic conditions in a region are favorable, human life is formed and continues there. These conditions are different in different parts of the world and it is necessary to use elements in the architectural body of the building with the aim of complying with the mentioned conditions. Archaeological evidence shows that humans have been aware of this issue since prehistoric times and have taken steps towards the optimal use of natural factors and reducing their negative consequences. The architecture of the residential and religious buildings discovered in Tepe Zagheh (Malek Shahmirzadi, 2011: 326-327) and the architectural works obtained from the V cultural period of the Tepe Sagzabad (Talaei, 2015: 145-145) are proof of such knowledge. By adopting suitable cooling and heating measures in the architectural body of the building, a mental condition is created in the residents that express their satisfaction with the thermal conditions of the environment, and it is called the thermal comfort range (Hejazizadeh & Karbalai Darei, 2014: 22).
Historical documents and archaeological data related to the Achaemenid Empire have been discovered from different parts of their territory, and architectural remains are among these discoveries. The architectural complex uncovered in the vicinity of Persepolis in Marvdasht plain is one of the architectural remains left over from the Achaemenid period. The architecture of this complex is in a way that has certain proportions and the Peymoon system (Javnmardi & et al., 2018: 123). The architectural body of each building must match the climatic conditions of the surrounding environment as much as possible in order to ensure the thermal comfort of its inhabitants. If the physical adaptability of the architecture is not enough, cooling and heating measures are taken to produce cold or heat in the building. The problem of the current research is to know the physical components of the architecture and the heating and cooling solutions thought in the architecture of the Persepolis complex in accordance with the climatic conditions of the Marvdasht plain, which can bring information about the adaptation of the architecture to the climatic conditions in the Achaemenid period.

Identified Traces
The physical components of the Achaemenid architecture of Persepolis, in order to implement these arrangements, include the orientation of the complex in relation to the azimuth of sunlight towards the south with a northwest-southeast extension, which is exposed to an average of the maximum amount of solar radiation energy and its optimal value. Due to the gradual construction of the complex, the high density and height of the buildings has caused the creation of passages and two courtyards with a small width, which has reduced the area of the movement field of unfavorable winds, shading the openings on hot days and causing a lot of failure in the passages. The use of mud-brick in the construction of walls and the creation of a flat covering of wooden beams with a large thickness, which has a high capacity and thermal delay, prevents the loss of heat on cold days and reduces the entry of heat from the outside into the interior of buildings on hot days. Installing openings in the northwest-southeast azimuth is an average of the maximum radiant heat (east) and optimal (east-west with south view) azimuths, and the amount of heat received from sunlight is suitable for hot and cold days of the year. Most likely, the doors and windows are closed on cold days. The construction of pillared porches in most buildings also played a role in adjusting the air inside. Applying these solutions in most of the hours from November to March, which is calculated as a total of 1632 hours, is not enough to ensure the thermal comfort of the residents of the complex, and heat production is needed.

Conclusion
Considering the great and well-studied achievements of the architects and master craftsmen of Persepolis in various architectural, technical and artistic fields, it is expected that they will have significant achievements in the field of adaptation of architecture to the environment and heating and cooling arrangements. Based on the analysis of the climatic conditions of Marvdasht Plain and the thermal comfort of its residents, it is more necessary to comply with the heating measures compared to the cooling measures in the architecture of a building in the mentioned area for climate adaptation and providing the thermal comfort of the residents. Natural heating measures include the use of heat from sunlight, which relieves the cold stress of the residents in some hours in the time range of October to April. The cooling arrangements also include shading on the openings and natural air ventilation, which provides thermal comfort to the residents from April to May and from September to October in some hours and in the middle days of the two mentioned periods at all hours of the day and night. There was no need for cooling during the year. In this collection, wall-mounted heaters similar to the examples of the third floor of Babajan Tepe Lorestan have not been identified. For this reason, it is likely that the inhabitants used portable metal fire-place similar to the Assyrian types and provided the necessary heat. Finally, the present research shows that the architects of Persepolis complex, as well as having mastered various architectural techniques, also had sufficient knowledge in relation to various aspects of climate adaptability and the adoption of heating and cooling measures in order to ensure the thermal comfort of the residents in different months of the year.