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

Authors

Aries Subiantoro, Electrical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, IndonesiaFollow
Nasruddin Nasruddin, Mechanical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, Indonesia
Feri Yusivar, Electrical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, Indonesia
Muhammad Idrus Al-Hamid, Mechanical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, Indonesia
Bagio Budiardjo, Electrical Engineering Department, Faculty of Engineering University of Indonesia, Depok 16424, Indonesia

Abstract

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.

Bahasa Abstract

Pemodelan Sistem Tata Udara Presisi Berstruktur Baru Menggunakan Kondenser Sekunder untuk Pengaturan RH. Tulisan ini membahas penurunan model matematis dinamis untuk sistem tata udara presisi (PAC) dengan struktur baru. Berbeda dengan sistem refrigerasi umumnya, sistem PAC yang diusulkan menggunakan kondenser sekunder tambahan untuk pengaturan kelembaban relatif. Mekanisme kerja dan proses siklus kompresi uap sistem ini diilustrasikan menggunakan psychrometric chart dan diagram tekanan-entalpi. Model nonlinier sistem diturunkan berbasis konservasi massa dan prinsip kesetimbangan energi dan kemudian dilinierisasi pada titik kerja untuk mengembangkan model ruang keadaan orde-8 yang cocok untuk disain pengendali multivariabel. Kualitas model linier dianalisa dari aspek respons transien, kontrolabilitas, observabilitas, dan interaksi antar variabel masukan-keluaran. Model yang dikembangkan diverifikasi secara simulasi menunjukkan kemampuan model untuk meniru karakteristik nonlinier dan interaksi variabel masukan-keluaran.

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Recommended Citation

Subiantoro, Aries; Nasruddin, Nasruddin; Yusivar, Feri; Al-Hamid, Muhammad Idrus; and Budiardjo, Bagio (2012) "Modeling of a New Structure of Precision Air Conditioning System Using Secondary Condenser for Rh Regulation," Makara Journal of Technology: Vol. 16: Iss. 1, Article 11.
DOI: 10.7454/mst.v16i1.1287
Available at: https://scholarhub.ui.ac.id/mjt/vol16/iss1/11