## 6 Conclusions  
A comprehensive aerodynamic and environmental assessment was carried out of the Na Phra Meru Historical Temple. The research integrated high-resolution 3D laser scanning, computational grid validation, onsite measurements, and academic benchmarking to ensure accuracy and scientific credibility. The investigation began with validating airflow behavior and identifying recirculation zones under five prevailing wind directions. The main conclusions were as follows:  
1. Internal airflow patterns were highly sensitive to wind direction, with distinct recirculation zones forming when the incoming wind was not aligned with the main entrance. This airflow behavior directly influenced temperature and humidity stability within the Temple, affecting the long-term preservation of materials. 2. In the analysis of the distribution of airflow properties, the spatial mapping of temperature, relative humidity, and turbulence kinetic energy (TKE) revealed that the central interior zone maintained relatively stable environmental conditions. However, there was increased moisture accumulation near wall surfaces, particularly in areas with low TKE. These conditions could encourage fungal growth and surface deterioration, consistent with observed physical damage on the rear wall of the [PERSON] image area. 3. The assessment of airflow fluctuation using the UI provided further insight into microclimatic consistency. Temperature and humidity values were highly uniform, with UI values above 0.95. However, there was greater variability in velocity and TKE, especially in areas affected by recirculation zones. These fluctuations contributed to uneven heat and moisture distribution, possibly accelerating structural aging and material wear. Figure 21: Ratio and magnitude of aerodynamic forces (in Nm) acting in the X, Y, and \(Z\) directions on temple walls under various wind conditions. One of the study's most notable findings was the identification of the role of the slit windows in natural ventilation. Contrary to prior assumptions, the airflow through these small architectural features did not merely escape but also formed a self-regulating outward air layer. This layer acted as a barrier that prevented external air from re-entering the building, helping to stabilize the indoor environment. This newly identified aerodynamic function has provided a deeper understanding of traditional Thai temple ventilation strategies. 5. Correlation analysis further confirmed the relationships among key environmental variables. There was a strong negative correlation between temperature and humidity and moderate correlations between velocity, TKE, and humidity. These quantitative relationships should provide a scientific foundation for developing improved microclimate management strategies in heritage buildings. 6. The analysis of aerodynamic forces revealed that wind direction had a marked impact on the magnitude and spatial distribution of force across the structure. The E and NE wind directions generated the highest loads, posing structural risks due to intense lateral pressure and potential uplift. 7. Finally, the moment analysis identified critical rotational stresses acting on the Temple. The E wind produced the largest rotational moment across the building width, while the NE wind was responsible for dominant moments in the length and vertical directions. These rotational effects highlighted the need to reinforce vulnerable structural components, including roof joints, ridge beams, wall corners, and projecting eaves, to reduce the risk of wind-induced fatigue. This study provided novel scientific insights into the relationship between airflow behavior and structural vulnerability in a heritage context.