Experimental Study of a Bubble Mode Absorption with an Inner Vapor Distributor in a Plate Heat Exchanger-Type Absorber with NH 3 -LiNO 3

Jorge J. Chan, Roberto Best, Jesús Cerezo, Mario A. Barrera and Francisco R. Lezama
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Jorge J. Chan: Facultad de Ingeniería, Universidad Autónoma de Campeche, Av. Agustín Melgar s/n Col, Buenavista 24030, Campeche, México
Roberto Best: Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco 62580, Morelos, México
Jesús Cerezo: Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca 62209, México
Mario A. Barrera: Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco 62580, Morelos, México
Francisco R. Lezama: Facultad de Ingeniería, Universidad Autónoma de Campeche, Av. Agustín Melgar s/n Col, Buenavista 24030, Campeche, México

Energies, 2018, vol. 11, issue 8, 1-16

Abstract: Absorption systems are a sustainable solution as solar driven air conditioning devices in places with warm climatic conditions, however, the reliability of these systems must be improved. The absorbing component has a significant effect on the cycle performance, as this process is complex and needs efficient heat exchangers. This paper presents an experimental study of a bubble mode absorption in a plate heat exchanger (PHE)-type absorber with NH 3 -LiNO 3 using a vapor distributor in order to increase the mass transfer at solar cooling operating conditions. The vapor distributor had a diameter of 0.005 m with five perforations distributed uniformly along the tube. Experiments were carried out using a corrugated plate heat exchanger model NB51, with three channels, where the ammonia vapor was injected in a bubble mode into the solution in the central channel. The range of solution concentrations and mass flow rates of the dilute solution were from 35 to 50% weight and 11.69 to 35.46 × 10 ?3 kg·s ?1 , respectively. The mass flow rate of ammonia vapor was from 0.79 to 4.92 × 10 ?3 kg·s ?1 and the mass flow rate of cooling water was fixed at 0.31 kg·s ?1 . The results achieved for the absorbed flux was 0.015 to 0.024 kg m ?2 ·s ?1 and the values obtained for the mass transfer coefficient were in the order of 0.036 to 0.059 m·s ?1 . The solution heat transfer coefficient values were obtained from 0.9 to 1.8 kW·m ?2 ·K ?1 under transition conditions and from 0.96 to 3.16 kW·m ?2 ·K ?1 at turbulent conditions. Nusselt number correlations were obtained based on experimental data during the absorption process with the NH 3 -LiNO 3 working pair.

Keywords: bubble absorber; absorption cooling; ammonia-lithium nitrate; plate heat exchanger (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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