Exergy assessment and exergy cost analysis of a renewable-based and hybrid trigeneration scheme for domestic water and energy supply

Exergy and exergy cost analyses are proposed as complementary methods for the assessment and better understanding of the efficiency of a hybrid trigeneration system based on renewable energy sources. The system combines photovoltaic/thermal collectors, an evacuated tube collector and a wind turbine...

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Bibliographic Details
Published in:Energy (Oxford) 2019-02, Vol.168, p.662-683
Main Authors: Usón, Sergio, Uche, Javier, Martínez, Amaya, del Amo, Alejandro, Acevedo, Luis, Bayod, Ángel
Format: Article
Language:English
Subjects:
Cost analysis
Desalination
Distillation
Domestic water
Electricity
Energy sources
Energy storage
Evacuation systems
Exergy
Fresh water
Freshwater environments
Hot water
Hybrid systems
Lead
Lead acid batteries
Photovoltaic-thermal collector
Photovoltaics
Polygeneration
Power consumption
Renewable energy
Renewable energy sources
Residential energy
Reverse osmosis
Storage batteries
Thermodynamics
Turbines
Water tanks
Wind power
Wind turbines
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Summary:Exergy and exergy cost analyses are proposed as complementary methods for the assessment and better understanding of the efficiency of a hybrid trigeneration system based on renewable energy sources. The system combines photovoltaic/thermal collectors, an evacuated tube collector and a wind turbine and produces electricity, sanitary hot water and desalted fresh water for a single family house. The system includes two desalination technologies (reverse osmosis and membrane distillation) that consume power and heat respectively, and two kinds of energy storage devices (a hot water tank and two lead-acid batteries). The assessment is based on simulations developed by using TRNSYS software. As a first level of detail, exergy analysis is applied in ten-minute basis to selected plant components. As a second level of detail, it is proposed to apply exergy-based indicators that summarize the system behavior during a longer period of time (monthly basis). By using aggregated values, exergy accumulation terms become negligible, what allows applying symbolic thermoeconomics to calculate exergy cost and to analyze in depth the process of cost formation. The system has an exergy efficiency of 7.76% (6.68 due to electricity, 0.33 due to fresh water and 0.75 due to sanitary hot water).
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2018.11.124