Hot water is a crucial demand for many of Ethiopia's industrial and household heating systems. Most industries are using boilers powered by conventional energy sources to meet the demand for hot water. Due to the environmental impact of conventional energy sources usage and the rise in fossil fuel prices, the utilization of solar energy as a source of energy become a promising candidate for various applications. We use MATLAB/SIMULINK software to carry out this study of solar water heating systems with heat pipe evacuated tube collectors. Comparisons of total solar radiations were made at various optimum tilt angles for the selected locations. The adjustment of tilt angles has a great impact on the collection of useful energy. The maximum average annual energy savings are 1.21E+06 kWh/year for Addis Ababa at monthly and seasonal optimum tilt angles, 1.26E+06 kWh/year for Dire Dewa at a monthly optimum tilt angle, and 1.21E+06 kWh/year for Hawassa at a monthly optimum tilt angle. This means it will reduce 326,700 kg of CO₂, 340,200 kg of CO_2, and 326,700 kg of CO₂ emissions per year respectively. The efficiency increases as the heat transfer fluid flow rate increases. The maximum annual cost savings are at monthly optimum tilt angles of the collector (6.12E+04 $/year, 6.36E+04 $/year, and 6.11E+04 $/year for Addis Ababa, Dire Dewa, and Hawassa cities, respectively with a payback period of 6.43 years, 6.18 years and 6.44 for Addis Ababa, Dire Dewa and Hawassa cities, respectively.

热水是埃塞俄比亚许多工业和家庭供暖系统的关键需求。大多数行业都在使用由传统能源驱动的锅炉来满足对热水的需求。由于传统能源使用对环境的影响和化石燃料价格的上涨，利用太阳能作为能源成为各种应用的有希望的候选者。我们使用 MATLAB/SIMULINK 软件对带有热管真空管集热器的太阳能热水系统进行了研究。对选定位置的各种最佳倾斜角度进行了总太阳辐射的比较。倾斜角度的调整对有用能量的收集有很大的影响。年平均最大节能量为 1。亚的斯亚贝巴每月和季节性最佳倾斜角为 21E+06 kWh/年，Dire Dewa 每月最佳倾斜角为 1.26E+06 kWh/年，Hawassa 每月最佳倾斜角为 1.21E+06 kWh/年. 这意味着它将减少 326,700 公斤的二氧化碳₂ ，每年分别排放340,200 kg CO ₂和 326,700 kg CO _{2 。}效率随着传热流体流速的增加而增加。最大的年度成本节省是在收集器的每月最佳倾斜角度（6.12E+04 美元/年、6.36E+04 美元/年和亚的斯亚贝巴、迪雷德瓦和哈瓦萨城市 6.11E+04 美元/年），亚的斯亚贝巴、迪雷德瓦和哈瓦萨城市的投资回收期分别为 6.43 年、6.18 年和 6.44 年。