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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