Performance investigation of desiccant air-conditioning system combined with heat pump
Date Issued
2013
Date
2013
Author(s)
Chen, Chih-Chieh
Abstract
The purpose of this study is develop an desiccant air-conditioning system that maintain a healthy indoor environment and be energy-efficient. The system combines a high performance dehumidification component with heat pump to form high temperature regenerative desiccant cooling system. First a novel desiccant wheel is developed and experimentally tested under various operating conditions. Later, the system is designed based on the fundamental tests of each component. The test of the system is conducted in an office and the economical and environmental effect is analyzed.
To develop a low-cost dehumidification component, the first part of this research investigates the performance of different desiccant wheels. Three types of desiccant packed bed, filled with silica gel particles, alumina particles, and elite particles respectively, are experimentally tested under different operating conditions. the results show that silica gel packed bed has better performance under the high temperature regeneration condition, and the latent and sensible heat effectiveness could be up to 67.9% and 59.3% respectively.
In the traditional design of the desiccant wheel, uneven distribution of the bed due to gravity poses a serious problem. To reduce the influence of gravity, a new packed bed design is proposed that separate the chamber is partitioned into 16 sections. This design also makes packed bed easier to adjust the quantity of the silica gel particles.
The last part of this research investigates the performance of the whole system, and the results indicates that the dehumidification capacity could be up to 7.4 kg/hr under the summer weather conditions, high temperature and high humidity. Compared with the system using commercial honeycomb silica gel wheel, the dehumidification capacity per unit cost of our system is much better, and therefore, it is applicable to install our system large space such as supermall and office buildings. Finally, energy conservation analysis of the system is conducted, and it is observed that the total energy saving of the system during a year-round operation is about 11,090 kWh, which means that approximately 13.8% energy could be saved.
Subjects
吸附除濕空調系統
填充床轉輪
熱泵
節能效益
高溫再生
SDGs
Type
thesis
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