The objective of the research undertaken in this paper is to design a control strategy using a
Linear Auto-Regressive Moving-Average Exogenous (ARMAX), which is a mathematical
modelling method in real time, which to be implemented into the closed-loop Proportional-
Integral controller. The ARMAX model is developed using SIMULINK tool from the MATLAB
R2020a software. The Vapour Compression Refrigeration System consists of an evaporator,
an expansion valve, a condenser and a compressor which was modified to a variable speed …

Nowadays significant amount of energy is consumed in commercial or residential buildings
by the heating, ventilation and air conditioning (HVAC) systems to provide thermally
comfortable indoor environment. Consequently, improving their efficiency becomes a critical
issue for energy and environmental sustainability. In most commercial buildings, chilled-
water from centrifugal chillers is supplied to air-handling units to meet the cooling needs of
the building. The overall system as shown in Figure 1 consists of two water circuits: in one …