Experimental Validation of Sizing Results
VII. Experimental Validation of Sizing Results
The developed model is used for the same design and operating conditions stated in literature in order to check its validity. Reference [32]presented the experimental measurements for small vertically-stacked MED plants of the horizontal tube falling film evaporators type using hot water as the thermal energy source for the first effect.
As shown in the Table X, using the same data stated
Fig. 21. Total cost for the three configurations by [32] the model results show good agreement with the
experimental values. Indeed, the numerical results The final design of heat exchanger network includes
obtained in this model are compared to the experimental four heat exchangers as shown in Fig. 22. The heat
values for the overall heat transfer coefficient. The exchangers (1) and (2) are used for heat recovery from
comparison shows that the values are highly similar and produced fresh water and rejected brine, respectively.
error doesn’t exceed 1 %. However, the error obtained Besides, the additional heat exchangers (a) and (b) are
for the condenser calculations is about 15 %. used in order to increase feed seawater in order to
In the case of using vertical tubes falling film achieve the target temperature for both the first effect and
evaporators, the model is validated based on the data and the second one.
results stated in reference [33]. As shown in Table XI, results show that the error of calculating the overall heat
transfer coefficients doesn’t exceed 15%.
TABLE X C OMPARISON B ETWEEN L ITERATURE R ESULTS A ND T HE D EVELOPED M ODEL F OR HTFF E VAPORATORS U (W/°C/m 2 )
Ti (°C)
Error
(kg/s)
1 (°C)
Model Ref [30] (%)
TABLE XI C OMPARISON B ETWEEN L ITERATURE R ESULTS A ND T HE D EVELOPED M ODEL F OR VTFF E VAPORATORS
U (W/°C/m Fig. 22. Final design of heat exchanger network 2 )
Model Ref [31] (%) Under steady-state conditions and in the region of the
(kg/s)
i-1 (°C)
(°C)
2289,8 2461 7 optimum (configuration 2 and ∆T min =6°C) the sensible
95 68 2045,9 2129 4 heat recovery is approximately equal to 50.79 kW, and
95 77 2188 2582 15 the sensible heat consumption used for feed seawater
VIII. Conclusion
References
In this paper, the optimal design and sizing of new [1] E.Delyannis, V.Belessiotis, Desalination: The recent development solar driven seawater desalination pilot unit is studied
path, Desalination 264 (2010) 206–213. [2] S. Al-Mutaz, Irfan Wazeer, Development of a steady-state
and presented. The unit uses a four effect evaporation mathematical model for MEE-TVC desalination plants, process technology with a production capacity of
Desalination 351 (2014) 9-18.
7m 3 /day of fresh water obtained from the evaporation of [3] Hisham El-Dessouky, ImadAlatiqi, S. Bingulac and Hisham 28% of feed seawater. The developed model is validated
Ettouney, Steady-State Analysis of the Multiple Effect Evaporation Desalination Process, Chem. Eng. Technol. 21 (1998)
based on published results in the literature; it is also
437-451.
flexible and could also be used for designing large [4] Darwish M.A.; El-Dessouky, The heat recovery thermal vapour- production capacities.
compression desalting system: A comparison with other thermal This paper is composed of two complementary
desalination processes, Applied Thermal Engineering, Volume 16, Issue 6, June 1996, Pages 523-537.
sections. The first one deals with the thermal analysis, [5] M.H. Khademi, M.R. Rahimpour, A. Jahanmiri, Simulation and modeling and the optimizing the evaporation process.
optimization of a six-effect evaporator in a desalination process, The second one deals with the optimization of the heat
Chemical Engineering and Processing 48 (2009) 339–347. exchangers network based on the Pinch analysis method.
[6] Seyed Ehsan Shakib, Majid Amidpour , Cyrus Aghanajafi, Simulation and optimization of multi effect desalination coupled
The obtained results show that using the horizontal tubes to a gas turbine plant with HRSG consideration, Desalination 285 falling film evaporators is more advantageous compared
(2012) 366–376.
to vertical tubes configuration in terms of the heat [7] Hisham T. El-Dessoukya,, Hisham M. Ettouneya, Faisal Mandani, transfer rate, maintenance rate, and the ease of cleaning
Performance of parallel feed multiple effect evaporation system for seawater desalination, Applied Thermal Engineering 20 (2000)
and use.
1679-1706.
Indeed, the obtained heat transfer coefficients range [8] Patricia Palenzuela, Ashraf S. Hassan, Guillermo Zaragoza, between 3.18 and 3.32kW/m 2 /K when using horizontal
Diego-C. Alarcón-Padilla, Steady state model for multi-effect falling film evaporators and between 2.15 and
distillation case study: Plataforma Solar de Almería MED pilot
plant, Desalination 337 (2014) 31–42. 2.4kW/m /K for vertical falling film evaporators when
[9] Ibrahim S. Al-Mutaz, IrfanWazeer, Comparative performance using the optimal tubes’ dimensions. Moreover, this
evaluation of conventional multi-effect evaporation desalination study reveals that the first effect heat transfer area could
processes, Applied Thermal Engineering 73 (2014) 1192-1201.
be reduced by increasing the heating medium [10] İbrahim Halil Yılmaz , Mehmet Sait Söylemez, Design and computer simulation on multi-effect evaporation seawater
temperature and decreasing the top brine temperature. desalination system using hybrid renewable energy sources in The optimization of the evaporation unit is then
Turkey, Desalination 291 (2012) 23–40. completed by Pinch analysis method for three possible
[11] Narmine H. Aly, Adel K. El-Fiqi, Thermal performance of heat exchanger networks to be used for heat recovery and
seawater desalination systems, Desalination 158 (2003) 127-142. [12] Ali M. El-Nashar, Amer A. Qamhiyeh, Simulation of the steady- feed seawater heating. The most optimal configuration
state operation of a multi-effect stack seawater distillation plant, can reach a reduction of 62% of the thermal power
Desalination 101 (1995) 231-243.
needed for seawater heating. [13] A.M. El-Nashar, M. Samad, The solar desalination plant in Abu The most relevant criteria and results obtained from
Dhabi: 13 years of performance and operation history, Renewable Energy 14 (1998) 263–274.
this study are summarized as follow: [14] Ali M. El-Nashar and Amer A. Qamhiyeh, Performance Using horizontal falling evaporators is more
Simulation of the Heat Accumulator of the Abu dhabi Solar advantageous when
Desalination Plant, Solar Energy Vol. 44. No 4,(1990) pp. 183- evaporators’ types; 191. [15] Ali M. El-Nashar, Performance of the Solar Desalination Plant at The design of the first effect differs from the other
compared
to
the other
Abu Dhabi, Desalination, 72 (1989) 405-424. effects because it uses hot water as a heating medium
[16] Ali M. El-Nashar and Amer A. Qamhiyeh, Simulation of the instead of using vapor;
Performance of MES Evaporators Under Unsteady State Operating Conditions, Desalination, 79 (1990) 65-83. Decreasing the first effect diameter increases the heat [17] Khaled M.Bataineh, Multi-effect desalination plant combined transfer rate, however the other effects show an
with thermal compressor driven by steam generated by solar opposite behavior towards the diameter change;
energy, Desalination 385 (2016) 39–52. [18] German Solar Energy Society, Planning & Installing Solar The selection of the optimal temperature difference Thermal Systems, second edition,(2010) pp 96-97. and
[19] Bela M. Fabuss and Alexander korosi, Boiling point Elevations configuration lead to a notable reduction of the
the suitable
of Seawater and It Concentrates, Journal of Chemical and required thermal power.
Engineering Data, Vol. 11, N°4, October 1966, pp 606-609. [20] Vincent Y. Lister, John F. Davidson, D. Ian Wilson, Calculating thermal fouling resistances from dynamic heat transfer
Acknowledgements measurements, Chemical Engineering Science 84 (2012) 772–
780. [21] Financial support; of the “Moroccan Agency for Solar D.Q. Kern, R.E. Seaton, A theoretical analysis of thermal surface
fouling, Chem. Eng. Prog. 4 (1959) 258–262. Energy IRESEN” for “Seawater desalination using solar
[22] A. Paul Watkznson, Process Heat Transfer: Some Practical energy” project; is cordially appreciated and gratefully
Problems, The Canadian Journal of Chemical Engineering, Vol. acknowledged.
58, October 1980, PP : 553-558. [23] D.Q. Kern, Process Heat Transfer, International Student Edition, 1950. [24] Paul E. Minton, Handbook of Evaporation Technology, Noyes 58, October 1980, PP : 553-558. [23] D.Q. Kern, Process Heat Transfer, International Student Edition, 1950. [24] Paul E. Minton, Handbook of Evaporation Technology, Noyes
Authors’ informations
Desalination, first edition 2002, Annexes pp 586-598. 1 Université Internationale de Rabat, Rocade Rabat-Salé, [26] Chung &Seban (1971). Transactions of ASME, Journal of Heat
11 100 Sala el Jadida, Morocco.
Transfer, Section C, 93, 391. [27] Xingsen Mu, Shengqiang Shen, Yong Yang &Xiaohua Liu (2012)
2 Ecole Mohammadia d’ Ingénieurs, Agdal-Rabat, Morocco. Experimental study of falling film evaporation heat transfer
coefficient on horizontal tube, Desalination and Water Treatment, Mohamed Ghazi was born in Morocco in 1989. 50:1-3, 310-316.
He received engineering degree in chemical and DOI: 10.1080/19443994.2012.719734
process engineering from Ecole Mohammadia [28] Shengqiang Shen, Rui Liu , Yong Yang, Xiaohua Liu &Juexian
d’Ingénieurs in 2012. He is currently pursuing Chen (2011) Condensation character of a stratified flow inside a
the PhD degree in seawater desalination horizontal tube, Desalination and Water Treatment, 33:1-3, 218-
combined with the use of renewable energy at 223.
LERMA laboratory, International university of [29] Shengqiang Shen, Luyuan Gong, Hua Liu, Xingsen Mu, Rui Liu,
Rabat, Morocco.
Characteristic study of steam maldistribution in horizontal-tube E-mails: [email protected] falling film evaporators, Applied Thermal Engineering 75(2015)
1-13. [30] B. Linnhoff, E. Hindmarsh, The Pinch design method for heat exchanger networks, Chem. Eng. Sci. 38 (1983) 745-763. [31] Desalting handbook for planners, Third Edition by RosTek Associates, Inc., Tampa, Florida Agreement Number: 98-PG-81- 0366 Desalination Research and Development Program Report No. 72 July 2003. [32] Ali M. El-Nashar, Predicting part load performance of small MED evaporators -a simple simulation program and its experimental verification, Desalination 130 (2000) 217-234. [33] Sandro Angeletti and Mauro Mores, Modelling of multiple-effect falling-film evaporators, J. Fd Technol. (1983) 18,539-563. [34] Manoj B. Kumbhare and S. D. Dawande, Performance evaluation of plate heat exchanger in laminar and turbulent flow conditions, International Journal of Chemical Sciences and Applications, Vol
4, Issue 1, 2013, pp 77-83. [35] Yousefi, M., Yousefi, M., Khaksar, W., B. Ismail Alnaimi, F., Nordin Darus, A., A Comprehensive Review on the Application of Evolutionary Computation in Design Optimization of Plate-Fin Heat Exchangers, (2015) International Review of Mechanical Engineering (IREME), 9 (1), pp. 81-89. [36] Shinde, S., Chavan, U., Performance of Turbulence Models on Heat Transfer and Pressure Drop with a 25° Continuous Helical Baffled Heat Exchanger, (2017) International Review of Mechanical Engineering (IREME), 11 (1), pp. 69-76. [37] Ababneh, A., Jawarneh, A., Tarawneh, M., Tlilan, H., Duić, N., Evaluation of Solar Parabolic Trough Collector for the Application of Seawater Desalination, (2016) International Review of Mechanical Engineering (IREME), 10 (6), pp. 443-451. [38] Altawil, H., Mogheir, Y., Analyzing the Impact of the Disposed Brine by Deir El-Balah Desalination Plant on Seawater Pollution Level in Gaza-Palestine, (2016) International Review of Civil Engineering (IRECE), 7 (1), pp. 18-26. [39] Mahal, S., Alimin, A., A Review of the Hybrid Solar Chimney and Water Desalination Systems for Simultaneous Production of Electricity and Fresh Water, (2016) International Review of Mechanical Engineering (IREME), 10 (6), pp. 419-436.
International Review on Modelling and Simulations (I.RE.MO.S.), Vol. 10, N. 3 ISSN 1974-9821
June 2017