Globally, potable water scarcity is pervasive problem. The solar distillation device is a straightforward apparatus that has been purposefully engineered to convert non-potable water into potable water. The experimental study is distinctive due to the implementation of a rotational mechanism within the pyramidal solar still (PSS), which serves to enhance the evaporation and condensation processes. The objective of this research study is to examine the impact of integrating rotational motion into pyramidal solar stills on various processes: water distillation, evaporation, condensation, heat transfer, and energy waste reduction, shadow effects, and low water temperature in saline environments. Ultimately, the study aims to enhance the production of distilled water. An economic evaluation was undertaken in order to ascertain the extent of cost reduction. Experiments measuring freshwater productivity and thermal performance were conducted over a three-month period at the University of Science and Technology in Tehran. The entire pyramid structure was rotated using a direct current motor driven by a photovoltaic cell. The research methodology entailed the operation of a PSS with varying rotational speeds (0.125, 0.25, 1, and 1.5 rpm) and without rotation, from 9 am to 4 pm. The findings suggested that the productivity of the distillation apparatus in terms of distilled water increased as the rotation speed rose, with the most pronounced increase occurring at 1 rpm in comparison to the other conditions. The presence of turbulence in the water enhanced the heat transfer occurring between the absorber plate and the water. At 2:00 p.m. on an experimental day, this effect was observed when the absorber plate temperature reached 79.1°C at 1.5 rpm. In contrast, its temperature decreased to 78°C when not in a state of rotation, as the intensity of solar radiation was higher in the non-rotation state. At 1 rpm, the solar pyramid distiller achieved a 30.2% increase in output compared to its non-rotating state. At 1 rpm, the distiller achieved a 20.6% increase in output compared to 0.25 revolutions per minute. In addition to the control condition, the thermal efficiency of the solar still varied as follows: at 1, 1.5, 0.25, and 0.125 rpm, it was 46.2%; at 44.2%, 37.8%; at 35.3%; and at 36.6%, respectively. Furthermore, distilled water generated by a pyramid solar still with rotation (PSSR) is priced at ＄0.03 per liter, whereas it costs ＄0.0317 per liter when produced by a pyramid solar still without rotation (PSS without R).

This paper is part of a series addressing the urgent need for effective technologies to reduce energy demand and mitigate climate impact. This study focused on the implementation and development of dynamic insulation technology for a sustainable and energy-efficient future in the region, especially in Iraq. The study assessed the energy efficiency of dynamic insulation technology by analyzing three wall models (static, dynamic, and modified) during the winter season. This paper expands the analysis to include a hot, dry summer scenario, providing valuable insights into the year-round performance of dynamic walls and enabling sustainable and energy-efficient solutions for Iraq’s climate. The study evaluates the thermal efficiency of the dynamic intake and exhaust facades during the cooling season for the city of Baghdad. The finding indicated that the dynamic intake facade reduces energy consumption by 16.3% for the dynamic wall and 17.2% for the modified dynamic wall. In addition, the dynamic exhaust front reduces energy consumption by 46% during the cooling season, with the maximum permissible exhaust air level. Dynamic insulation is suitable for hot and dry climates, improving energy consumption.