Simulation of active humidity control with a packaged air conditioner using heat-recovery-reheat coil

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Simulation of active humidity control with a packaged air conditioner using heat-recovery-reheat coil

 

Author: Leung, Yuk-nang Gus
Title: Simulation of active humidity control with a packaged air conditioner using heat-recovery-reheat coil
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Air conditioning -- Simulation methods
Heat recovery -- Simulation methods
Humidity -- Control
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: xiii, 91, [43] leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1661014
URI: http://theses.lib.polyu.edu.hk/handle/200/1946
Abstract: A computer simulation program was developed to investigate the feasibility to achieve active humidity control and energy saving with a packaged air-conditioner using reheat coil which recovery waste heat rejected by the air-conditioner. The program consists of mathematical model of an air-cooled direct expansion (DX) air cooling system with heat recovery reheat coil and air-to-air heat exchanger, and a simple room model. The reheat coil was designed as an extension of the air-cooled condenser of the cooling system to recover heat being rejected by the system to reheat the supply air that may have been overcooled by the cooling coil of the system. The discretized mathematical model of DX system was derived with an emphasis on the air cooling, dehumidification and air reheating processes for studying the transient and steady state behavior of the system. The room model was designed to simulate indoor sensible and latent heat loads for studying the performance of the system in real life situation. Besides the typical cooling loads such as transmission heat losses, occupancy, home appliance and infiltration, moisture transport mechanism was included in the room model to simulate the variation in indoor humidity level. By using the program to simulate an air-cooled DX system operating under various conditions, the energy efficiency and operating characteristic of using the two reheating methods were compared. The results showed an air-cooled DX system using heat recovery reheat coil was found technically feasible and energy efficient for air-cooling and dehumidification applications.

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