Case 14295

Method, System and Apparatus for High Efficiency Thermal Desalination


Humidification dehumidification (HDH) desalination, evaporator, condenser, Multi-Stage flash (MSF), Multi-Effect Distillation (MED)


Water purification, especially desalination of sea water


Maximum brine temperature and heat input are limited by calcium sulphate precipitation and hard scales on heat transfer equipment, resulting in lower thermal performance.


The invention improves the performance of previously patented humidification dehumidification desalination systems by identifying methods and apparatuses to increase the temperature and pressure of the energy input without exceeding a top brine temperature. It also entails a method to optimally recover and reuse the energy input to the system to attain maximum efficiency of water production.


Avoids fouling typically associated with high temperature energy source desalination systems.

The system performance can be high for these systems under optimum conditions (a Gained-output-ratio GOR of 20 is possible).

Increases the quality of the steam, by reducing the total entropy rate by up to 50%

  • Professor John H. Lienhard (Department of Mechanical Engineering, MIT)
  • Syed M. Zubair (Department of Mechanical Engineering, KFUPM)
  • Prakash Narayan Govindan (Department of Mechanical Engineering, MIT)
  • Karan Hemant Mistry (Department of Mechanical Engineering, MIT)

Intellectual Property:

US Non-Provisional Utility Patent Application 13/028170 filed 2/15/2011

PCT Utility Patent Application PCT/US2012/024287 filed 2/8/2012

Gulf Cooperation Council Utility Patent Application 2012/20506 filed 2/13/2012


K.H. Mistry, G.P. Narayan, A. Mitsos, J.H. Lienhard V. Multi-pressure humidification-dehumidification desalination using thermal vapor compression and energy recovery. Submitted to: Proceedings of the 21st National & 10th ISHMT-ASME Heat and Mass Transfer Conference. December 27-30, 2011, IIT Madras, India. ISHMT_USA_015

Related Cases:

MIT TLO Case 13622: Efficient Humidification-Dehumidification Water Desalination

Last revised: May 11, 2012

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