4.3. Analysis of mechanical element The building was designed as modern today, mechanical and electrical systems will complete the system such as: air-conditioning-ventilation, lighting system, system equipment used often in buildings (pumps, Office equipment ...), hot water system, the system of escalators and elevators. To operate the electric system of the building served the living and production, then the building annually spend huge expenses to pay for the electricity consumption of the building. The application of the solution to the electric system to use the energy saving and efficiency is essential, helping to reduce the building costs dramatically every year. Through the process of actual surveys in 50 works, we collect and aggregate data of 50 works as follows:4.3.1. HVAC systems HVAC systems are systems including air-conditioning and ventilation used in the buildings. This system helps to keep the building cooling, heating and regulating fresh air, exhaust fit for living and production. We can split HVAC system 2 system as follows:a. the air conditioning system:Due to the purpose of use and design of each building is different HVAC systems of buildings should also be designed and operate differently, focusing primarily on type 4: two air conditioners; VRV/VRF air conditioning system; air conditioning system cooling chiller wind; water cooling chiller systems. This is aggregate data table of the 50 works:
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