Investigation of Performance Enhancements for Air Brayton/ORC Combined Cycles for Small (~ 2 MWe) Power Systems and a Moderate Heat Source Temperature

Attractive power generation cycles from economic and sustainability considerations are highly efficient and require minimal cooling water. Air Brayton cycles (ABCs) require no cooling water; however, air Brayton combined cycles (ABCCs), which require a minimal water, are more efficient. Several ABCs...

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Bibliographic Details
Published in:JOM (1989) 2019-05, Vol.71 (5), p.1616-1622
Main Authors: Litrel, Joseph, Guillen, Donna Post, McKellar, Michael
Format: Article
Language:English
Subjects:
Air intakes
Chemistry/Food Science
Computational Approaches for Energy Materials and Processes
Cooling
Cooling water
Earth Sciences
Efficiency
Electric power generation
Engineering
Environment
Evaporative cooling
Exergy
Heat exchangers
Heat recovery
Heat recovery systems
Laboratories
Natural gas
Nuclear energy
Nuclear power plants
Payback periods
Physics
Rankine cycle
Regeneration
Temperature
Thermodynamics
Turbines
Water
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Summary:Attractive power generation cycles from economic and sustainability considerations are highly efficient and require minimal cooling water. Air Brayton cycles (ABCs) require no cooling water; however, air Brayton combined cycles (ABCCs), which require a minimal water, are more efficient. Several ABCs and ABCCs designed to operate at 5 MWth (~ 2 MWe) were evaluated in temperate environments with a constant temperature heat source at 650°C. An Organic Rankine cycle (ORC) operating with r143a was selected for the bottoming cycle based on previous analyses. Efficiency can increase from 22.0% in the standard ABC to 39.8% in the ABCC. Various performance enhancements were explored, including air inlet cooling, ORC regeneration, and ORC reheat. For the recuperated ABCC with evaporative cooling, the capital cost is 
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-018-3257-6