An energy saving atmospheric evaporator utilizing low grade thermal or waste energy

M. M. Aboabboud, L. Horvath, G. Mink, M. Yasin, A. I. Kudish

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


A specially designed compact thermal unit has been developed and tested for reducing the quantity of thermal energy required in evaporation and thickening processes. In this unit, a relatively large fraction of the heat of condensation and the sensible heat of the warm distillate is recycled and utilized for preheating the feedstock and evaporating the liquid phase within the evaporation chamber. The yields obtained in such a thermal recycle unit can be increased by a factor of three relative to a simple single-effect (i.e. without recycling) evaporation unit operating under the same thermal energy input conditions. The proposed unit operates under atmospheric conditions and below the liquid boiling point. It resembles a multi-tubular film absorber. Since the evaporation chamber casing is heated (as opposed to being cooled), it performs as an air-blown film evaporator. A laboratory scale unit was built and tested to produce distilled water from city mains water. Its thermal efficiency corresponded to a three stage vacuum evaporator. The main advantages of the proposed design are: simple construction, low fixed capital investment costs, low operation/maintenance costs and its amenability to utilize low grade thermal or waste (e.g. wet steam, exhaust gas, hot fluid) energy resources.

Original languageEnglish
Pages (from-to)1107-1117
Number of pages11
Issue number12
StatePublished - 1 Jan 1996

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modeling and Simulation
  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Pollution
  • Mechanical Engineering
  • Energy (all)
  • Management, Monitoring, Policy and Law
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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