A small scale multi-effect distillation (MED) unit for rural micro enterprises

Sen, P.K.; Sen, Padma Vasudevan; Mudgal, Anurag; Singh, Shikha

doi:10.1016/j.desal.2010.11.005

Cited by 16 publications

(4 citation statements)

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“…No literature is available for studying the heat transfer coefficient for a novel VTE arrangement incorporated in an SS MED. The overall heat transfer coefficient (

U_{eff}

) is estimated using the correlation presented by Onishi et al, 27 the estimate of which, for the given input parameter range, was comparable with the available literature 24–26

U_{eff i} = 0.001 (1939.4 + 1.40562 T_{normalb i} - 0.00207525 {(T_{normalb i})}^{2} + 0.0023186 {(T_{normalb i})}^{3}) .

…”

Section: Modeling Formulationmentioning

confidence: 64%

“…An experimental study of the MED plant using a VTE has illustrated a high heat transfer coefficient in the range of 10,000–20,000 W/m 2 K by Sen et al 24 These results were obtained for VTE with evaporating feed film formation outside the tubes as demonstrated by Sen et al 25,26 This arrangement provides feasibility for maintenance by the unskilled workforce. The MED plant modeled in this study is aimed to be utilized for a rural location with low population density; thus, VTE is selected for this plant.…”

Section: Description Of the Ss‐vte‐med Systemmentioning

confidence: 82%

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Investigation on a small‐scale vertical tube evaporator multieffect desalination system: Modeling, analysis, and optimization

2021

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A growing population with depleting water resources has increased the requirement for desalination systems. Large‐scale desalination plants have seen a growth in the recent period; however, the small‐scale (SS) decentralized desalination plants' need has not been realized for the rural population. Low specific heat consumption for multieffect desalination systems makes it suitable for such decentralized operation. The challenge now lies in determining the system capacity and optimal operational range for the SS requirements. In this study, the thermoeconomic model for an SS multieffect desalination system for various configurations is developed. Optimization of the SS plant for the number of effects is performed to determine the optimal operational range of motive steam pressure, motive steam flow rate, and feed water flow rate. Total distillate production and freshwater cost are focused on objectives and constraints imposed over the input parameters with SS production. The results reveal that for a distillate production of 750 L/day, the motive steam flow requirement is estimated to be 25–35 kg/h with a pressure range of 2–5 bar. This study provided an overview for selecting the number of effects based on the commercial aspect of total production requirements.

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“…No literature is available for studying the heat transfer coefficient for a novel VTE arrangement incorporated in an SS MED. The overall heat transfer coefficient (

U_{eff}

) is estimated using the correlation presented by Onishi et al, 27 the estimate of which, for the given input parameter range, was comparable with the available literature 24–26

U_{eff i} = 0.001 (1939.4 + 1.40562 T_{normalb i} - 0.00207525 {(T_{normalb i})}^{2} + 0.0023186 {(T_{normalb i})}^{3}) .

…”

Section: Modeling Formulationmentioning

confidence: 64%

Section: Description Of the Ss‐vte‐med Systemmentioning

confidence: 82%

Investigation on a small‐scale vertical tube evaporator multieffect desalination system: Modeling, analysis, and optimization

2021

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“…It could be concluded that the optimal feed flow rate was 75 kg/h, as this amount of feedwater was appropriate for the feedwater to reach saturation temperature on the shell side, by pre-heating via the condensing steam in the tube side. The flow rate of 75 kg/h also ensured integral film formation on the shell walls of the vertical tube evaporator tubes to avoid hot spot formation [24]. The determined optimum feedwater salinity (0.6%) and flow rate (75 kg/h) were employed in this part.…”

Section: Influence Of the Feedwater Flow Rate On Cr And Gormentioning

confidence: 99%

“…The difference in temperature ΔT between the tube and shell side should be kept small to have optimum recovery of distillation in subsequent effects. At the same time, ΔT should be sufficient for condensing the steam inside the tubes [25]. The influence of the feed temperature on CR and GOR was studied by varying the amount of the feed temperature used for the experiment (15, 25, 35, 45˚C) with employing the feedwater salinity (0.6%) and flow rate (75 kg/h), the fresh steam flow rate (17 m 3 /h) previously determined.…”

Section: Influence Of the Feedwater Temperature On Cr And Gormentioning

confidence: 99%

A lab-scale MED dealing with salinity wastewater: the study of optimal operation schemes and parameters

Zhao

Liu

Xue

et al. 2015

Desalination and Water Treatment

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2015): A lab-scale MED dealing with salinity wastewater: the study of optimal operation schemes and parameters, Desalination and Water Treatment, A B S T R A C TMulti-effect distillation (MED) system with a top brine temperature lower than 70˚C, is one of the most successful desalination technologies. In this paper, a lab-scale vertical tube MED system was performed for salinity wastewater desalination of petrochemical enterprises, and five salinity wastewater treatment schemes including different combinations of evaporator types were investigated. As a result, the falling-falling-climbing (FFC) system was considered as the optimal scheme. Then, the operation parameters including the feedwater salinity, temperature, flow rate, and the fresh steam flow rate were further optimized. The results indicated that the CR and gained output ratio (GOR) would rise up by increasing effect numbers, fresh steam flow rate, and feedwater temperature. While CR and GOR would fall down with the increase of the feedwater salinity and flow rate. Therefore, the optimal operation parameters were experimentally determined as follows: the feedwater with salinity of 0.6%, flow rate of 75 kg/h, and temperature of 45˚C, and fresh steam flow rate of 17 m 3 /h. The maximum CR and GOR were up to 5.08 and 4.13, respectively.

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