Energy-saving has become a strategic target locally and internationally to conserve natural resources and reduce green gas emissions and pollution to the environment. University of Jeddah (UJ) is emerging as a dynamic promising institution welling to implement energy-saving strategies to its facilities. It is expected to have a significant impact on Saudi society, the surrounding environment, and future generations. The most reasons that cause an increase in electric energy consumption at UJ has been addressed. Some of these reasons are due to weather conditions such as high temperature and sandstorms, which would negatively affect the performance of air conditioning system, and some of which are related to the design of air conditioning systems, calculating thermal loads and choosing the appropriate type for the nature of the operation of the building. Choosing the appropriate type of maintenance and addressing common technical problems in air conditioning systems such as internal and external fouling of indoor and outdoor of ac units are other reasons that indirectly affect the rate of energy consumption. At the university, air conditioning systems consume about 80% of the total electric energy. So, redesign the current air condition systems and applying planned maintenance type such preventive and condition-based maintenance are the most direct and effective ways for realizing energy saving at university facilities\nKeywords: Energy saving; internal and external fouling, condition-based maintenance. VRF

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