الفهرس 
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Abstract
Increased energy costs have brought about increased concern by building owners aboutthe operating cost and energy budgets for buildings. This growing energy conservationconsciousness has brought about many changes in the attention focused on the energyperformance of buildings particularly that of heating, ventilating, and air conditioning systems –here after abbreviated HVAC systems. Various types of heating, ventilating, and air-conditioning(HVAC) applications are: apartment buildings, banks, office buildings, hospitals, industrialplants, schools, restaurants, department stores, hotels, etc.This research presents a framework for using HVAC system control principles and theirapplications. Aim of this thesis is to reduce energy consumptions by defining new HVAC controlstrategies .A case study is carried out in Beshbishy hospital which is located in Cairo, Egypt tocalculate cooling capacity by using the help of Hourly Analysis Program (HAP) and total energyconsumption and these calculations will show the energy savings. HVAC system will becontrolled by using building management system (BMS).Building Energy Management Systems (BEMS) is one of the best known solutions in
improving building operation. The BEMS are generally applied to the control of active systems,.heating, ventilation, and air-conditioning (HVAC) systems, while also determining theiroperating times. Use BEMS has proved that it is one of the effective ways for building operation.The thesis consists of Five main parts. The first part explains the HVAC designparameters for sterile spaces, building management system and it’s advantages and disadvantages.The second part presents the basic components and automatic control of HVAC system control.The third part explains the designing and managing a building management system of airconditioningcomponents of surgical operation theater within a case study in an effective way tosave energy, reduce the energy consumptions and show which strategy is the best in savingpower. The fourth part of the thesis shows the input and output points of AHU, EXHAUST AIRFAN, FCU, AIR COOLED CHILLER and the network drawing. The fifth part shows the resultwhich have been calculated and draw relationships between them within a case study whichillustrates the sequence of operation in each season of the year and the changes between seasons.The last part is a conclusion about HVAC, BMS systems and the importance of both of them inenergy savingThe results show that occupied strategy is one of the most preferred strategy which savesenergy about 13%. Two strategies can be combined in one system to save more energy. Whenoccupied strategy with unoccupied strategy is used, the energy saved can reach approximately15%. The last two strategies save more energy than running equipment only when neededstrategy, which is the least efficient of the three strategies, so this strategy is not used