HVAC (Heating Ventilating and Air Conditioning) is a system that includes heating, ventilation and air conditioning, and finds wide application areas such as factories, hospitals, shopping malls and places where energy consumption is intense. Depending on the structure of the buildings, the energy spent for HVAC accounts for 15 to 60% of the total energy. For this reason, optimization of HVAC systems is very important in terms of energy efficiency.
Optimal control in HVAC systems; It is to adjust the temperature and pressure values of the system according to the needs with automatic control, to provide comfort conditions by putting unused environments into the heating and cooling system, and also to adjust the limited energy usage. The control methods used in HVAC systems are psychrometric based controls, and the control of the system should be considered in the design of these controls, and regional controls should be avoided. Otherwise, the necessary efficiency cannot be obtained from the system.
With automation control strategies, HVAC is the best choice between temperature, air and flow rate. The algorithms used determine the desired conditions and the time required for these conditions to occur.
Why HVAC is Required?
- It is indispensable for energy efficiency and control.
- It minimizes operating costs.
- The best comfort conditions can only be created by HVAC systems.
- Medicine, food etc. It can be provided by HVAC systems for clean, antibacterial air and humidity conditions desired in the sectors.
- It reduces personnel expenses and offers management from a single center.
Fresh air is circulated in a pipe system at a constant temperature. Comfort temperature is regulated by VAV, ie local air flow system. Thanks to the special design of the VAV box, it draws the room air into it without using any fan and mixes it with the primary air and blows it back into the room. With a dirty air pipe system, it enters a new cycle in the CTA
(Air Handling Unit).
All macro functions required to control the HVAC system have been developed by WAGO application engineers and are included in the software libraries. Thus, a significant time saving is achieved in project works. Web interfaces are also included in these macros.
Example Air Handling Unit
The function library contains macros for the following air handling units.
- 100% fresh air, constant flow
- 100% fresh air, 2nd stage fan
- Mix air, constant flow
- Constant flow heat recovery
HVAC Application Example Project
Varyap Meridian houses include VAM devices control, energy monitoring system, elevator, generator, wind turbine and solar panels integrated into the building management system and environmental lighting control. Controls are carried out at thousands of points with Ethernet controllers, and all basic equipment in the building operation is monitored via Modbus.