Journal
ENERGIES
Volume 14, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/en14227560
Keywords
exergy; exergoenvironmental analysis; trigeneration; life cycle assessment; environmental impacts; Eco-indicator 99
Categories
Funding
- National Council for Scientific and Technological Development (CNPq, Brazil) [307394/2018-2]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [001]
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The environmental performance of a combined cooling, heating, and power system was analyzed using a SPECO-based exergoenvironmental analysis. The highest total environmental impact rate was related to the internal combustion engine, with pollutant formation being the primary source of environmental impact. Solar-assisted trigeneration system decreased the environmental impact per exergy unit of chilled water by 10.99%, and further improvements can be made by enhancing the exergy efficiency and employing a treatment to remove nitrogen oxides.
The environmental performance of a combined cooling, heating, and power system is analyzed in this study at a component-level using a SPECO-based exergoenvironmental analysis. The engine consumes natural gas and produces 168.6 kW net power. The waste heat is recovered by a LiBr-H2O absorption chiller and a heat exchanger, which are used for cooling and heating purposes. The energy system is assisted by a solar field. An environmental Life Cycle Assessment quantifies the environmental impacts of the system, and these data are combined with exergy evaluations. The highest total environmental impact rate, 23,740.16 mPt/h, is related to the internal combustion engine, of which pollutant formation is the primary source of environmental impact. Compared with a non-renewable energy system, the solar-assisted trigeneration system decreased the environmental impact per exergy unit of chilled water by 10.99%. Exergoenvironmental performance can be further improved by enhancing the exergy efficiency of the solution pump and high-pressure generator (HG), and by employing a treatment to remove nitrogen oxides in the reciprocating engine.
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