Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 198, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2019.111811
Keywords
Water harvesting; Dry climate; Multi-stage; Desiccant wheel; Heat pump; Water harvesting rate; Water harvesting efficiency
Categories
Funding
- National Natural Science Foundation of China [51706015]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-014A3]
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This paper discusses effective ways to harvest water from air for residential use in dry climate area. An air handling process was proposed to humidify the air through multi-stage desiccant wheels before being dehumidified by the evaporator to harvest water. This approach not only increases the evaporating temperature but also increases the water harvesting rate (WHR) greatly. Two configurations of multi-stage desiccant wheels were compared, and proper desiccant wheel structure, length and number of stages were suggested. As for the energy system, two configurations of heat pump system (HPS) were compared and heat recovery is highly recommended, which can increase the system performance by around 70%. Effects of condensing temperature and outlet humidity ratio of air after water harvesting on WHR and water harvesting efficiency (WHE) were studied. When the ambient condition is 40 degrees C and 5 g.kg(-1), it is suggested to be operated under the condition that omega(reg,out) is 6 g.kg(-1) and tc is 90 degrees C. WHR and WHE can reach 32.5 kgh(-1) and 1.26 kg.kWh(-1), respectively. Performances of the system, which adopts MSDW-2 and HPS-2, under different ambient conditions were studied and con, ut ranges with high WHE were summarized for different ranges of omega(ambi).
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