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Standby equipment is accommodated for troubleshooting and maintenanceĪn equipment room is located outside the conditioned area, or adjacent to or remote from the building Maximum capacity is required for each equipment Significant first cost and operating cost Temperature, humidity, and space pressure requirementsįulfilling any or all of the design parametersĬonsidering HVAC diversity factors to reduce the installed equipment capacity The distribution system mainly varies according to the refrigerant type and the delivering method such as air handling equipment, fan coils, air ducts, and water pipes.

The HVAC systems need the distribution system to deliver the required amount of air with the desired environmental condition. These process can be achieved by using suitable HVAC equipment such as heating systems, air-conditioning systems, ventilation fans, and dehumidifiers. Other processes can be added such as humidification and dehumidification process. The required processes include the heating process, the cooling process, and ventilation process. HVAC systems can be classified according to necessary processes and distribution process.

The selection of HVAC systems in a given building will depend on the climate, the age of the building, the individual preferences of the owner of the building and a designer of a project, the project budget, the architectural design of the buildings.

Depending on outdoor conditions, the outdoor air is drawn into the buildings and heated or cooled before it is distributed into the occupied spaces, then it is exhausted to the ambient air or reused in the system. The main mission of HVAC system is to satisfy the thermal comfort of occupants by adjusting and changing the outdoor air conditions to the desired conditions of occupied buildings. HVAC systems are more used in different types of buildings such as industrial, commercial, residential and institutional buildings. Heating, ventilation, and air conditioning (HVAC) system is designed to achieve the environmental requirements of the comfort of occupants and a process.