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Flooding Limitations in a Three-Phase Direct Contact Condenser for the Utilisation of Low-Grade Energy Sources for Desalination and Power Generation Application

Publication Date Jan 1, 2016

Abstract

The continuing enhancement of energy recovery cycles that exploit low grade energy resources requires an efficient heat absorption and rejection system. Implementation of a conventional surface type heat exchanger, evaporator or condenser has many disadvantages. The low efficiency, fouling, corrosion problems, high cost and high heat transfer resistance are the most important shortcomings that emerge as a result of the metallic barriers involved. On the other hand, a direct contact heat transfer device offers a high heat transfer area and reduces or eliminates fouling and corrosion problems. They can also work with very low temperature differences and subsequently can enhance the cycle efficiency. Direct contact heat exchangers clearly have many advantages over surface type heat exchangers and can also be efficiently used in places where the surface heat exchanger cannot be.Accordingly, direct contact heat exchanger can be found in different applications, such as water desalination and power generation from geothermal brine. Water desalination utilising direct contact heat exchangers can be achieved by two general methods: direct contact freezing-melting and direct contact evaporation- condensation. The former is based on the ability to remove water from a solution by freezing it out as crystalline ice. The ice or crystal should contain only pure water; therefore the partial freezing separates the fresh water from brine. The ice melts at another stage to produce distilled water. Direct contact freezing exploits the concept o...

Concepts
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Direct Contact Heat Exchangers
Hot Brine
Direct Contact
Dispersed Phase
Direct Contact Evaporation
Direct Heat
East Mesa Geothermal Field
Surface Type Heat Exchanger
Phase Mass Flow Rate
Volumetric Heat Transfer Coefficient

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