Novel multistage flash reversal Concept: Modelling and analysis

Esrafili, Ali; Orfi, Jamel; Al-Ansary, Hany; Alsaadi, Ahmad Salem; Ghaffour, Noreddine

doi:10.1016/j.applthermaleng.2022.119223

Cited by 9 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The standard model for OT‐MSF adopted from El‐Dessouky and Ettouney [ 26 ] and previous work [ 23 ] is listed in Table A in Appendix and is denoted as OT. Simulation of the standard model is straightforward as the temperature distribution along the stages is fixed and predetermined.…”

Section: Process Description and Modellingmentioning

confidence: 99%

“…Simulation of the standard model is straightforward as the temperature distribution along the stages is fixed and predetermined. Despite the simplified model, for a specified production rate the model is solved iteratively to determine the required feed rate for the seawater (Ali et al [ 23 ] ). To numerically solve the model equations, some parameters must be pre‐specified.…”

Section: Process Description and Modellingmentioning

confidence: 99%

“…Since the m s is correlated to m f , the latter is considered the only unknown independent parameter. Thereby, m f is determined by trial‐and‐error method to make the obtained total distillate equal the target value (Ali et al [ 23 ] ). It should be noted that the OT‐MSF model, which also serves as the foundation of the RV‐MSF model, is validated against published data.…”

Section: Process Description and Modellingmentioning

confidence: 99%

“…It should be noted that the OT‐MSF model, which also serves as the foundation of the RV‐MSF model, is validated against published data. [ 23 ]…”

Section: Process Description and Modellingmentioning

confidence: 99%

“…A similar reversal concept was applied by Lee et al [ 24 ] to a multi‐stage air gap membrane distillation (AGMD). The analysis of Ali et al [ 23 ] shows in particular that for equal recovery ratio, reversal MSF can outperform the standard OT‐MSF in terms of gain output ratio and specific energy consumption if the heating is provided from a free thermal energy source such as waste heat, geothermal energy, or solar thermal energy.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Improved modelling and simulation of once‐through and reverse multi‐stage flash desalination configurations

et al. 2023

Self Cite

View full text Add to dashboard Cite

An improved model for multistage flash (MSF) structures is developed and used to assess the performance of a novel MSF configuration, termed as MSF reversal (RV‐MSF) and consisting of reversing the brine circulation stream. The improved model determines the temperature distribution within the stages using heat balance equations while the simplified one, which is commonly used, is based on pre‐specified, constant, and equal temperature distribution throughout the stages. The performance of the RV‐MSF is investigated and compared with conventional MSF once‐through (OT‐MSF) with and without brine mixing using simplified and full models. It is found that the simplified model overestimates the required heat transfer specific area for both MSF configurations. Moreover, it underestimates the cooling water and energy requirements for the reversal configuration. Hence, the simplified model may be good for quick analysis but leads to inaccurate design specifications and economic analysis. When brine mixing is utilized, the simplified model still provides erroneous estimates of the heat transfer area for both MSF configurations. Nevertheless, for OT‐MSF structure, the simple model can provide comparable predictions with that of the improved model in terms of recovery ratio, performance ratio, and specific energy consumption. For the RV‐MSF structure, a mismatch in the two model predictions of surface area, cooling water, and energy requirements is observed. Furthermore, the temperature drop in the cooling system for RV‐MSF has a significant influence on the specific surface area and cooling water requirements especially at low values. The different behaviour of the simplified model between the OT‐MSF and RV‐MSF configurations is attributed to the fact that brine recycling does not affect the feed temperature or the temperature distribution in the system.

show abstract

Section: Process Description and Modellingmentioning

confidence: 99%

Section: Process Description and Modellingmentioning

confidence: 99%

Section: Process Description and Modellingmentioning

confidence: 99%

“…It should be noted that the OT‐MSF model, which also serves as the foundation of the RV‐MSF model, is validated against published data. [ 23 ]…”

Section: Process Description and Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%