在世界许多地方，空调系统是电能消耗的主要部门之一，用于提供人体舒适所需的冷却或加热。如今，空调是导致埃及能源短缺的因素之一。由于室外温度的升高和冷却的必要性，2012年至2016年的夏季，空调明显出现在电力行业。由于气候变化和预期的全球变暖效应，空调需求每年都在增加。此外，舒适度的提高也在进一步推进。 使用可再生能源的区域冷却系统可能是减少空调用电需求的解决方案。此外，许多绿色空调系统的构造方式消除了对CFC、HCFC或HFC制冷剂的需求[Bereche等人，2009年]，符合国际项目（如基加利冷却效率项目（KCEP））的未来计划，开发使用绿色资源的区域冷却。本案例研究将对使用可再生能源的联合区域冷却装置进行优化，同时对使用传统能源的部分进行优化。 案例研究将讨论三种不同冷却系统方案的完全不同模拟，基线方案将仅使用电蒸汽压缩制冷机，而第二种方案将是带有天然气吸收式制冷机的电制冷机混合系统，第三种情况是混合系统，部分吸收式制冷机使用太阳能系统产生的热水，并比较结果，探索太阳能作为热源在每天小时和一年左右的最佳利用。案例研究的结果将包括上述一年中的三种不同情景，以确定电厂的性能、年能源消耗，以及电厂使用可再生能源部分的最佳比例，以满足可持续和可靠的工作环境。 引用:佛罗里达州奥兰多2020年冬季会议论文

Air-conditioning system is one of the major sectors of electrical energy consumption in many parts of the world to provide the cooling or heating requiredfor human comfort. Nowadays, air-conditioning is one of the factors causing the energy shortage in Egypt that was clearly appeared in the electricitycut in summer seasons through year’s 2012 to 2016 due to the increase of the outdoor temperature and the necessity of cooling. The air conditioningdemand is increasing yearly due to the climatic changes occurring with the global warming effects expected. Also the increased comfort conditionsaspiration are going further in progress.District cooling systems using renewable energy sources could be the solution to reduce the demand for electricity accompanied with air conditioning. Inaddition many green air conditioning systems are constructed in ways that eliminate the need for CFC, HCFC or HFC refrigerants [Bereche Et al.2009], which comply with the future plans for the international programs such as The Kigali cooling efficiency program (KCEP) in developing thedistrict cooling to be with green resourcesThe case study will apply optimization of combined district cooling plant working with renewable energy sources in parallel with a part working withthe traditional energy sources. The case study will discuss complete different simulation for three different cooling systems scenarios, base line scenariowill be using electric vapor compression chillers only while the second scenario will be hybrid system of electric chillers with natural gas absorptionchillers, and the third scenario is hybrid system by having part of the absorption chillers using hot water generated by solar system, and compare theresults to explore the optimum usage of the solar energy as a heat source through the daily hours and around the year.The output of the case study will include the three different scenarios along the year as mentioned above to identify, performance of the plant, annualenergy consumptions, and the optimum fraction for the part of the plant working with the renewable energy in order to satisfy a sustainable and reliableworking environment.