Memsys Clearwater Pte. Ltd.

Singapore, Singapore

Memsys Clearwater Pte. Ltd.

Singapore, Singapore

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Kum Ja M.,National University of Singapore | Hoong Choo F.,Nanyang Technological University | Li B.,Nanyang Technological University | Chakraborty A.,Nanyang Technological University | And 3 more authors.
Heat Transfer Engineering | Year: 2017

A two-dimensional numerical simulation model for a membrane-based heat and mass exchanger was developed. The system model equations were used to determine the coupled heat and moisture transfer from the humid air to the high concentrated liquid desiccant solution (LiCl, lithium chloride) by means of a parallel stack hydrophobic permeable membrane. The two streams of air and liquid desiccant solution were arranged in cross-flow directions. The fourth-order Runge–Kutta method was employed to solve these system model equations in a steady-state condition. This model enables one to predict the latent effectiveness of a membrane-based parallel cross-flow exchanger for dehumidification purpose in response to air to liquid mass flow ratio and the mass transfer unit number. © 2017 Taylor & Francis Group, LLC.


Choo F.H.,Nanyang Technological University | Ja M.K.,Nanyang Technological University | Zhao K.,Memsys Clearwater Pte. Ltd. | Chakraborty A.,Nanyang Technological University | And 4 more authors.
Energy Procedia | Year: 2014

This study aims to provide an experimental performance analysis of a membrane based multi-effect regenerator for dehumidification application powered by solar thermal energy. The regenerator system is used as a desiccant solution concentrator to re-concentrate the salt solution by removing some water content in the used solution from the dehumidification system. The concentrated solution can also be used as a solar energy storage system by storing the high concentrated desiccant solution to be used in the de-humidifier. In the membrane based multi-effect regenerator, the merits of multi-effect evaporation and membrane's mass transfer process are applied. It uses an energy recovering process by using the multi-effect evaporation concept and the membrane's mass transfer process driven by low grade temperature and pressure gradient. In this study, different operating parameters such as feed flow rates, feed concentration and heating temperature were examined to determine the optimum performance of this membrane based multi-effect regenerator.


Chafidz A.,King Saud University | Al-Zahrani S.,King Saud University | Al-Otaibi M.N.,King Saud University | Hoong C.F.,Nanyang Technological University | And 2 more authors.
Desalination | Year: 2014

We have developed an integrated solar-driven desalination system that uses membrane distillation process to produce potable water. The system encompasses the sources of both water and energy. The system is an integrated (self-contained) system that utilizes solar energy for its operation by combining solar photovoltaic (PV) and solar thermal collectors. The system is intended for autonomous operation in arid remote areas of Saudi Arabia where electricity and potable water are not readily available. Due to its portability, the system can be used in emergency situations in which potable water is essential for survival, such as natural disasters. The system has three major components.the solar-thermal system, solar-PV system, and membrane distillation system. A well-characterized memsys Vacuum Multi-Effect Membrane Distillation (V-MEMD) module was used as the core of the system. In addition, a heat pump was integrated into the system to improve the performance of the system. The novelty of the system is the engineered design of a portable and efficient integrated system that is reliable and easy to maintain. The system could be referred to as an environmentally friendly and sustainable desalination technology. The paper describes the design, configuration, and performance of the solar-driven desalination system. © 2014 Elsevier B.V.


Zhao K.,Memsys clearwater Pte. Ltd. | Heinzl W.,Memsys clearwater Pte. Ltd. | Wenzel M.,TU Munich | Buttner S.,Memsys clearwater Pte. Ltd. | And 4 more authors.
Desalination | Year: 2013

The memsys has successfully commercialized the vacuum-multi-effect-membrane-distillation (V-MEMD) module. This compact memsys module employs hydrophobic membranes as a separating medium and makes use of vacuum to enhance membrane distillation process. This novel V-MEMD module enables highly efficient heat recovery. Compared with conventional thermal desalination processes, the memsys module shows advantages in lower investment and operational cost, and higher energy efficiency. In this paper, solar and diesel heater were used as heating sources to drive the memsys V-MEMD module. The solar driven memsys system illustrates good operating performance with a flux at approximately 7 LMH on a sunny day using seawater as feed. The diesel heater driven memsys system was used to investigate the effects of heating, cooling and feed conditions on the module performance using tap water as feed at a relatively low operating temperature (45. ~. 60°C). The results show that heating and cooling temperature are the main factors affecting flux and energy efficiency. The optimization of number of module stage and size of each stage were also studied. The experimental results show that the memsys module has great potential in increasing the Gain Output Ratio (GOR), which is one of the most important criteria for industrialization of MD technology. © 2012 Elsevier B.V.

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