TY - JOUR
T1 - Toward efficient thermal desalination via alternate vertical array flow of binary liquids
AU - Zhao, Zhiyong
AU - Zheng, Hongfei
AU - Ma, Xinglong
AU - Liang, Shen
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2025/3/15
Y1 - 2025/3/15
N2 - Traditional humidification and dehumidification desalination process encounters obstacles related to inefficient heat and mass transfer and components separation, leading to complex structure and low volume freshwater yield. Given this, this paper proposes an alternate vertical array flow of binary liquids separation process of hot seawater and cold freshwater, which can integrate humidifier and dehumidifier into one chamber, potentially achieving compact and efficient humidification and dehumidification desalination. Its heat and mass transfer are markedly enhanced as the evaporation and condensation occur simultaneously between cold freshwater and hot seawater films. Meanwhile, to reuse the sensible and latent heat of hot seawater and water vapor, a two-stage alternate evaporation and condensation humidification and dehumidification desalination system is developed. Theoretical models are established, and the optimal theoretical model is identified by comparing with experimental results. Subsequently, optimization investigations are conducted to determine the favorable geometric parameters for the evaporation and condensation process, highlighting an optimum separation distance of 10 mm between seawater and freshwater, and an optimal vertical flow height of 1.0 ∼ 1.5 m. Besides, its gained-output-ratio can reach 1.21 when operating at an initial seawater temperature of 80 °C and mass flow rate of 20 kg/h for both freshwater and seawater. This work potentially advances the compactness and efficiency of humidification and dehumidification desalination technology.
AB - Traditional humidification and dehumidification desalination process encounters obstacles related to inefficient heat and mass transfer and components separation, leading to complex structure and low volume freshwater yield. Given this, this paper proposes an alternate vertical array flow of binary liquids separation process of hot seawater and cold freshwater, which can integrate humidifier and dehumidifier into one chamber, potentially achieving compact and efficient humidification and dehumidification desalination. Its heat and mass transfer are markedly enhanced as the evaporation and condensation occur simultaneously between cold freshwater and hot seawater films. Meanwhile, to reuse the sensible and latent heat of hot seawater and water vapor, a two-stage alternate evaporation and condensation humidification and dehumidification desalination system is developed. Theoretical models are established, and the optimal theoretical model is identified by comparing with experimental results. Subsequently, optimization investigations are conducted to determine the favorable geometric parameters for the evaporation and condensation process, highlighting an optimum separation distance of 10 mm between seawater and freshwater, and an optimal vertical flow height of 1.0 ∼ 1.5 m. Besides, its gained-output-ratio can reach 1.21 when operating at an initial seawater temperature of 80 °C and mass flow rate of 20 kg/h for both freshwater and seawater. This work potentially advances the compactness and efficiency of humidification and dehumidification desalination technology.
KW - Evaporation and condensation
KW - Falling film
KW - Humidification and dehumidification (HDH)
KW - Thermal desalination
UR - http://www.scopus.com/inward/record.url?scp=85213497253&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2024.125350
DO - 10.1016/j.applthermaleng.2024.125350
M3 - Article
AN - SCOPUS:85213497253
SN - 1359-4311
VL - 263
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
M1 - 125350
ER -