AUTOMATIC CONTROL OF AIR-HANDLING (HVAC) SYSTEMS Methods for Automation Control
There are unfortunately no established rules or methods for how an industrial process can be controlled. The methods are usually the necessary and desirable functions and requirements for accuracy, which is necessary for an economical and quality product.
In providing a correctly optimized and accurate control system, all sections of the professional team involved in the project have to work together as a fully cooperating group. This includes persons who have a working knowledge of the process and those who are responsible for the automation and the electrotechnical aspects of the project.
• Initially roughly design the systems.
• Survey the functions of the control system.
• Check the system requirements for the required accuracy.
• Select the control system and the user interface.
• Select the process subproduct.
• State the degree of responsibility for delivery and commissioning.
The user interface and the simplicity of usage are important issues. Likewise, stabilized and qualified control for some of the control loops must be as simple as possible.
Also important is the interplay between different sensors, controllers, automation equipment, and objects regulated by the control equipment. The requirements of pumps, fans, batteries, heat exchanger, valves, motors, etc. in standard sizes may greatly differ from the theoretical calculations. Because of this fact, the control equipment, in addition to satisfactory control, must be capable of correcting the differences between the calculated and delivered subproducts.
An automated technical installation is normally no better than the weakest subproduct in the process, system, or installation,
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