M Kum Ja, Ph.D.

Research Scientists

Research Scientist

Research Interests

  • Cloud-based real-time optimization control system for chiller plant, district cooling, smart pumping network, and adsorption/absorption Chiller.-Machine learning system for refrigeration cycle using grey box model and genetic algorithm.
  • Dew Point/ Direct/ Indirect Evaporative Cooling.-Heat and mass transfer of membrane and solid desiccant for dehumidification.-Vacuum multi Effect Membrane Distillation for Liquid Desiccant Air Conditioning.
  • Cascading temperature waste heat recovery system.-Decentralize Energy Resources for district heating and cooling system (PolyGen).-Phase change energy storage system.
  • Development of situ probe for Methane Hydrate layer.
  • Characteristic of methane hydrates during formation and dissociation.
  • Response of Methane Hydrate under Microwave Irradiation.

Selected Publications

  • Isotherms and thermodynamics for the adsorption of n-butane on Maxsorb III; B. B. Saha, A. Chakraborty, S. Koyama, S. H. Yoon, M. Kumja, C. R. Yap and K.C.Ng, International Journal of Heat and Mass Transfer, Volume 51, Issues 7-8, April 2008, Pages 1582-1589.
  • Modelling of a Novel Desorption Cycle Used by Dielectric Heating Method; M Kumja, Ng Kim Choon, Christopher Yap, H Yanagi , S. Koyama,B. B. Saha, A.Chakarborty, Modern Physics Letters B, Vol. 23, No.3 (2009) Pages 425-428.
  • The adsorption thermodynamics and performance analysis of an idealized adsorption cycle using HFC-134a and activated carbon; Wai Soong Loh, Kum Ja M, Kazi Afzalur Rahman, Kim Choon Ng, B. B. Saha, S. Koyama, Ibrahim I.El-Sharkawy; Heat Transfer Engineering 
  • Numerical and experimental investigations on a two-bed mode adsorption chiller; M Kumja, Ng Kim Choon, Christopher Yap, Ibrahim I.El-Sharkawy,Wan Jinbao, A. Chakraborty, B. B. Saha, S. Koyama; The 22nd IIR International Congress of Refrigeration, August,2007, ICR07-E2-1063.
  • Numerical and Experimental Study on Heat Transfer Process under Microwave Irradiation Using Reflector to Enhance Energy Absorption Rate; M Kumja, Ng Kim Choon, Wai Soong Loh, Mark Aaron Chan,Christopher Yap2008 ASME Summer Heat Transfer Conference, August, 2008, Jacksonville, FL, USA.
  • Modeling of a Novel Desorption Cycle Used by Dielectric Heating Method; M Kumja, Ng Kim Choon, Christopher Yap, H Yanagi , S. Koyama,B. B. Saha, A.Chakarborty. The Second International Symposium on Physics of Fluids (ISPF2), June, 2008, Jiuzhaigou, China
  • Modeling and Simulation of a Novel Microwave Driven Sorption Cycle; M Kumja, Ng Kim Choon, Christopher Yap, S. Koyama, B. B. Saha, (ISHP 2008) International Sorption Heat Pump Conference, September, 2008, Seoul, KOREA.
  • A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification; DT Bui, MK Ja, JM Gordon, KC Ng, KJ Chua,Energy 132, 106-115.
  • Multivariate scaling and dimensional analysis of the counter-flow dew point evaporative cooler; J Lin, RZ Wang, M Kumja, TD Bui, KJ Chua. Energy Conversion and Management 150, 172-187.
  • Recent developments in solid desiccant coated heat exchangers–A review; P Vivekh, M Kumja, DT Bui, KJ Chua,Applied Energy 229, 778-803.
  • Modelling and experimental investigation of the cross-flow dew point evaporative cooler with and without dehumidification, J Lin, RZ Wang, M Kumja, TD Bui, KJ Chua, Applied Thermal Engineering 121, 1-13.
  • Experimental study on the performance of membrane based multi-effect dehumidifier regenerator powered by solar energy; FH Choo, M KumJa, K Zhao, A Chakraborty, ETM Dass, M Prabu, B Li, Energy Procedia 48, 535-542.
  • A thermodynamic platform for evaluating the energy efficiency of combined power generation and desalination plants; KC Ng, M Burhan, Q Chen, D Ybyraiykul, FH Akhtar, M Kumja, RW Field, npj Clean Water 4 (1), 1-10 


Ph.D. in Mechanical Engineering, Nov 2010, National University of Singapore, Singapore. 

Professional Profile

  • 7 Jan 2021- Present: Research Scientist, 
    Water Desalination and Reuse Center, KAUST, Saudi Arabia
  • 26 Nov 2015- 8 Aug 2020: Senior Research Fellow,
    Energy Conversion Lab Mechanical Engineering Department, National University of Singapore
  • 17 Jul 2012-25 Nov 2015: Research Fellow,
    Energy Research Institute @NTU Nan yang Technological University, Singapore
  • 5 May 2011-16 Jul 2012: Technical Director,
    Keyser Technologies Tuas Avenue 11, Singapore
  • Apr 2010–May 2011: Research Fellow,
    Centre for Offshore Research& Engineering, Civil Engineering Department, National University of Singapore
  • Sep 2009 –Apr 2010: Research Fellow (B), 
    Energy Sustainability Unit (ESU), School of Design and Environment, National University of Singapore
  • Jan2005–Oct 2010: Ph.D. Research Student, 
    Micro Systems Technology Initiative Lab, Department of Mechanical Engineering, National University of Singapore
  • 1998 -2004: Assistant Lecturer, 
    Department of Mechanical, MTU Mandalay. Myanmar


  • “IES Prestigious Engineering Achievement Awards 2018” from Institution of Engineers,Singapore (IES)
  • “ASEAN Outstanding Engineering Achievement Award” from ASEAN Federation of Engineering Organizations in 2018
  • Scientific Presentation Award, ERI@N Scientific Workshop, Nov2013. 

Non-KAUST Affiliations

  • Water Desalination and Reuse Center (WDRC)
  • Division of Biological and Environmental Sciences and Engineering (BESE)​​

Research Interests Keywords

Optimization chiller Evaporative cooling Dessicant dehumidification Microwave dehumidification Membrane dehumidification