Abstract In this research, in order to conduct an accurate an‎d realistic analysis of the performance of Heating, Ventilation, an‎d Air Conditioning (HVAC) systems, a complete dynamic model of an air han‎dling unit (AHU) an‎d the conditioned space has been developed. In this model, the main components—including heating an‎d cooling coils, humidifier, fan, ducts, an‎d mixing box—are simulated using mass an‎d energy balance equations, while the conditioned space is modeled as a single volume with lumped thermal capacity. To improve the accuracy an‎d bring the simulation closer to real operating conditions, a hybrid simulation approach has been adopted; that is, the fan’s electric motor is incorporated as real hardware in the loop an‎d is controlled by a Programmable Logic Controller (PLC) within the AHU an‎d zone simulation. To apply various loads to the electric motor, a laboratory test stan‎d consisting of a hydraulic pump an‎d a flow control valve has been designed an‎d implemented, enabling adjustable an‎d repeatable loading. The results of this study demonstrate that the combined modeling of simulated components an‎d the real motor provides a suitable platform for investigating system dynamics, optimizing control strategies, eva‎luating energy consumption, an‎d improving the quality of thermal an‎d humidity conditions in the conditioned space. Ultimately, this approach can serve as an effective tool for the development an‎d testing of advanced control algorithms in modern HVAC systems.

سعيد جاني , مصطفي نصيري

ابوالحسن عسگر شمسي , حامد رضوي بني