Study of a Hybrid Solar Absorption-Cooling and Flash-Desalination System

Nicolás Velázquez-Limón, Ricardo López-Zavala, Luis Hernández-Callejo, Jesús A. Aguilar-Jiménez, Sara Ojeda-Benítez and Juan Ríos-Arriola
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Nicolás Velázquez-Limón: Centro de Estudios de las Energías Renovables, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali 21280, Mexico
Ricardo López-Zavala: Laboratorio de Residuos Sólidos, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali 21280, Mexico
Luis Hernández-Callejo: Department of Agricultural Engineering and Forestry, Campus Universitario Duques de Soria, University of Valladolid (UVA), 42004 Soria, Spain
Jesús A. Aguilar-Jiménez: Centro de Estudios de las Energías Renovables, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali 21280, Mexico
Sara Ojeda-Benítez: Laboratorio de Residuos Sólidos, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali 21280, Mexico
Juan Ríos-Arriola: Centro de Estudios de las Energías Renovables, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali 21280, Mexico

Energies, 2020, vol. 13, issue 15, 1-18

Abstract: In this work, the analysis of a hybrid LiBr/H 2 O absorption-cooling and flash-desalination system, using solar thermal energy as heat source, is presented. An absorption open-cycle with three pressure levels is used in combination with a single-stage flash-desalination process to use the coolant as product water, resulting in an increase in cooling and desalination efficiency. For the application, a 20-room coastal hotel complex in San Felipe, Baja California, Mexico, is taken as a case study and the sizing of the solar collection and storage system is carried out for the operation of the proposed hybrid system, during the summer operative period. The operational dynamics during the week with the highest ambient temperatures are presented. The dimensioning of the solar collector’s area and the energy storage resulted in a collection area of 620 m 2 with 30 m 3 , respectively, reaching a solar fraction of 69%. The absorption-cooling subprocess showed an increase of 13.88% in the average coefficient of performance (COP) compared to conventional LiBr/H 2 O absorption systems. Also, considering that the system provides cooling and desalination simultaneously, the average COP G is 1.64, which is 2.27 times higher than the COP of conventional LiBr/H 2 O single-effect absorption units. During the critical week, the system presented a desalinated water production of 16.94 m 3 with an average performance ratio (PR) of 0.83, while the average daily water production was 2406 kg/day; enough to satisfy the daily water requirements of four people in a coastal hotel in Mexico or to cover the basic services of 24 people according to the World Health Organization.

Keywords: solar energy; absorption cooling; desalination (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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