Title: Exergy analysis and exergoeconomic assessment of trigeneration system: a case study

Authors: Ana Lívia Formiga Leite; Carlos Antônio Cabral Dos Santos; Alvaro Antonio Villa Ochoa; Paula Suemy Arruda Michima

Addresses: Department of Mechanical Engineering, Technology Center, Federal University of Paraiba, Cidade Universitaria, s/n, CEP: 58051-900, João Pessoa/P.B., Brazil ' Department of Mechanical Engineering, Technology Center, Federal University of Paraiba, Cidade Universitaria, s/n, CEP: 58051-900, João Pessoa/P.B., Brazil ' Department of Mechanical Engineering, Academic Department of Industrial Control, Federal Institute of Pernambuco, Av. Prof Luiz Freire, 500, CEP: 50740-540, Recife/PE, Brazil; Department of Mechanical Engineering, Technology Center, Federal University of Pernambuco, Av. Prof. Moraes Rego, 123, CEP 50670-901, Recife/PE, Brazil ' Department of Naval Engineering, Technology Center, Federal University of Pernambuco, Av. Prof. Moraes Rego, 123, CEP 50670-901, Recife/PE, Brazil

Abstract: An energetic and exergetic analysis based on the first and second thermodynamic laws, and an exergoeconomic assessment by the SPECO method was applied to a trigeneration system. Two LiBr/H₂O absorption chillers and a diesel combustion engine integrate. The system was proposed to meet the energy demands of a resort in Piauí in northeast Brazil. A numerical program for the trigeneration system simulation was developed. The effective electrical power of the generator and thermal load provided by the chillers were 192 kW and 260.45 kW, respectively. For water heating, the capacity found was 127.68 kW at two temperature levels, 40°C and 60°C. The overall efficiency system was evaluated by the energy utilisation factor (EUF). The EUF for the trigeneration system was 81.6%. The engine and the double effect absorption chiller high-pressure steam generator presented the largest sources of destroyed energy and the most considerable portion of the total installation cost.

Keywords: trigeneration; absorption chiller; diesel engine; energy and exergy efficiency; exergetic cost.

DOI: 10.1504/IJEX.2021.117055

International Journal of Exergy, 2021 Vol.35 No.4, pp.527 - 554

Received: 24 Jun 2020
Accepted: 20 Jan 2021
Published online: 13 Aug 2021 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article