Vol 16, No 1 (2012) > Articles >

Modeling of a New Structure of Precision Air Conditioning System Using Secondary Condenser for Rh Regulation

Aries Subiantoro 1 , Nasruddin Nasruddin 2 , Feri Yusivar 1 , Muhammad Al-Hamid 2 , Bagio Budiardjo 1


  1. Electrical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, Indonesia
  2. Mechanical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, Indonesia



A dynamic mathematical model for a new structure of precision air conditioning (PAC) has been developed. The proposed PAC uses an additional secondary condenser for relative humidity regulation compared to a basic refrigeration system. The work mechanism for this system and a vapour-compression cycle process of the system are illustrated using psychrometric chart and pressure-enthalpy diagram. A non-linear system model is derived based on the conservation of mass and energy balance principles and then linearized at steady state operating point for developing a 8th-order state space model suited for multivariable controller design. The quality of linearized model is analyzed in terms of transient response, controllability, observability, and interaction between input-output variables. The developed model is verified through simulation showing its ability for imitating the nonlinear behavior and the interaction of input-output variables.

Keywords: modeling, multivariable model, precision air conditioning, vapour-compression cycle
Published at: Vol 16, No 1 (2012) pages: 68-78

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