Performance simulation and analysis of temperature and humidity independent control air-conditioning system using Energy-Plus

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Performance simulation and analysis of temperature and humidity independent control air-conditioning system using Energy-Plus


Author: Jing, Shuangzhan
Title: Performance simulation and analysis of temperature and humidity independent control air-conditioning system using Energy-Plus
Degree: M.Eng.
Year: 2012
Subject: Air conditioning -- Control.
Humidity -- Control.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xi, 73 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record:
Abstract: Since energy crisis, energy conservation has been widely concerned. Energy consumption in building takes a very large portion in total energy consumption around the world, in which heating, ventilation and air-conditioning (HVAC) system plays a significant role. With the improvement of standard of living, occupants require more comfortable and healthier indoor environment, especially after SARS. Therefore, novel air conditioning system aiming at maintaining acceptable indoor environment quality while minimizing energy consumption is the key to solve this problem. Many research works have been done to find out alternative air-conditioning system to provide more energy-saving and healthier indoor environment. As a kind of alternatives for conventional air-conditioning system, the temperature and humidity independent control (THIC) system normally consists of two subsystems: the humidity control subsystem such as dedicated outdoor air system, solid desiccant system and liquid desiccant system, and the temperature control subsystem such as chilled ceiling and dry coils. The humidity control subsystem is responsible for removing latent load while the temperature control subsystem is for removing sensible load. Since the latent load and sensible load can be removed separately, the indoor temperature and humidity can be controlled separately. Therefore indoor thermal comfortable can be improved.
This research introduces and compares various THIC systems firstly and then focuses on the dedicated outdoor air system - dry coil (DOAS-DC) system, because the DOAS-DC system can be conveniently built by retrofitting exiting conventional air conditioning systems. System configuration, operation strategy as well as strengths and weakness of the DOAS-DC system are analysed. Simulation study on the platform of EnergyPlus is conducted to compares the performance of the DOAS-DC system with those of conventional constant air volume (CAV) system in terms of energy consumption and indoor thermal comfort. A typical office space is built on EnergyPlus. The simulation tests are performed using the hot and humid weather data in Hong Kong. Annual energy consumption of the DOAS-DC system and the CAV system serving the same office space are obtained to compare their energy performances. The simulation results indicate that energy consumption of the DOAS-DC system is 20.1% less than that of the conventional CAV system while maintaining the same indoor design parameters. Besides, the DOAS-DC system can maintain more stable indoor thermal parameters, i.e. the indoor temperature and humidity, than the CAV system.

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