Selected Publications
Hawlader, M N A and B M Liu, Numerical study of the thermal-
hydraulic performance of evaporative natural draft cooling
towers. Applied Thermal Engineering , 22 (2002): 41-49. (United
Kingdom). Publication_no : 0142397
Hawlader, M N A , M S Uddin and H J Zhu, Encapsulated phase
Change materials for thermal energy storage : experiments and simulation. International Journal of Energy Research , 26, 2 (2002): 159-171. ( United Kingdom). Publication_no : 0149021
Hawlader, M N A , S K Chou, K A Jahangeer, S M A Rahman and K W
Eugene Lau, Solar-assisted heat-pump dryer and water heater.
Applied Energy, 74 (2003): 185-193. Publication_no : 0161807
Hawlader, M N A, Prasanta K Dey, Sufian Diab and Chang Ying
Chung, Solar assisted heat pump desalination system.
Desalination , 168(2004): 49-54. Publication_no : 0190028
Rahman, H, M N A Hawlader and A Malek, An experiment with a
single-effect submerged vertical tube evaporator in multi-effect
desalination. Desalination , 156 (2003): 91-100.
Publication_no : 0166970
Chua, K T, M N A Hawlader and A Malek, Pretreatment of
seawater: results of pilot trials in Singapore. Desalination ,
159 (2003):225-243. Publication_no : 0166976
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Current
Research Areas and Activities
Desalination
Multi-effect Distillation: performance of an evaporator
Multi-stage flash distillation (MSF) has been in use for
the last forty years for the conversion of seawater to fresh water.
Multi-effect desalination (MED) and Reverse Osmosis (RO) processes are
gaining popularity in recent years. MED is considered very energy efficient
but some of the difficulties prevented wider application of it. In this
project, attempts have been made to develop an efficient evaporator for use
in MED stages. This study includes tube bundles of different materials and
configurations. This is an ongoing project and the student will be involved
in both experimental as well as simulation studies.
A vapour compression desalination system to produce fresh
water
To convert saline seawater to fresh water for various
applications in domestic and industrial sectors, multi-stage flash
distillation (MSF) has been in use for the last forty years. Multieffect
desalination (MED), Reverse Osmosis and vapour compression processes are
gaining popularity in recent years. In a vapour compression desalination
system, vertical tube bundles are used for heat exchange purposes. The heat
transfer to fluid inside the tube leads to an evaporation and thus
existence of a two-phase mixture. The vapour is compressed in a compressor
to raise its temperature, which condenses over the vertical tube giving up
latent heat to the fluid flowing through the tube. The student will conduct
experiments on a pilot plant and analyse its performance under different
operating conditions.
Solar Energy
A solar desalination
system using heat pump
Desalination (to produce fresh water) industry has gone
through a rapid progress in technology, volume of production, and market
value of such water.
The production of fresh water by desalination has increased
from 5000 m3/day (in 1960) to 20.3x106 m3/day (in 1995). Multi-Stage Flash
(MSF) distillation method has served the industry very well over the last
four decades. Recent development in Multi-Effect Desalination (MED) and
Reverse Osmosis has shown greater potential for these processes and likely
to have a favourable competition with MSF. In this project, which has been
in operation for about two years, the
single effect of a MED system, integrated to a solar assisted heat pump,
will be investigated.
Drying
Improvement of quality of materials dried under inert
medium
Many pharmaceutical and food products are sensitive to
temperatures and often prone to oxidation leading to a loss of the quality.
Most of the pharmaceutical products are freeze dried, although it leads to
a higher price. In this project, a system is developed to drymaterials
under conditions of low temperature, where an inert drying medium is used
toprevent oxidation. The quality of the product, in terms of physical
appearance and nutrients,will be evaluated under different operating
conditions.
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