A novel LiBr/H2O absorption cooling and desalination system with three pressure levels

López-Zavala, R.; Velázquez, N.; González-Uribe, L.A.; Aguilar-Jiménez, J.A.; Alvarez-Mancilla, J.; Acuña, A.; Islas, Saúl

doi:10.1016/j.ijrefrig.2019.01.003

Cited by 18 publications

(7 citation statements)

References 26 publications

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“…The approach temperatures of the heat exchanger equipment EVA, GEN, ABS, CON and HX1 are those reported by [29] and those of HX2 are those reported by [30].…”

mentioning

confidence: 73%

“…It is important to note that the hybrid system uses three pressure levels where the absorber has a higher pressure than the evaporator, which results in a thermal compressor with less ∆P, improving efficiency and allowing the evaporator to work with adequate pressures for cooling [29]. On the other hand, the system has an internal energy integration in which the heat from the absorber and condenser is used to preheat the seawater before it is taken to the desalination subprocess; this allows the cooling of the CON and ABS without requiring an expensive cooling tower.…”

Section: System Descriptionmentioning

confidence: 99%

“…The activation temperature levels are suitable to enable the system to be coupled to a solar thermal collector field to obtain the energy required for its operation. This system is an improvement to the work presented in [29] and is studied under the dynamics of solar resource availability and cooling demand variation of a 20-room hotel complex as a case study.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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In this work, the analysis of a hybrid LiBr/H2O 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 m2 with 30 m3, 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/H2O absorption systems. Also, considering that the system provides cooling and desalination simultaneously, the average COPG is 1.64, which is 2.27 times higher than the COP of conventional LiBr/H2O single-effect absorption units. During the critical week, the system presented a desalinated water production of 16.94 m3 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.

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“…The approach temperatures of the heat exchanger equipment EVA, GEN, ABS, CON and HX1 are those reported by [29] and those of HX2 are those reported by [30].…”

mentioning

confidence: 73%

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Although water is one of the most commonly-encountered and the most thoroughly researched substances, also in terms of its use in refrigeration, scientists' efforts to discover its hitherto unknown properties or to modify those already researched do not cease. Water, as one of the most common substances on earth, is popular in industrial and power engineering applications such as combined heat and power (CHP), multi-effect desalination (MED) [1], adsorption [2,3], absorption [4,5], or ejector cooling systems [6]. All these applications struggle with the low heat transfer coefficient of water under reduced pressure.…”

Section: Introductionmentioning

confidence: 99%

Pool Boiling Heat Transfer Coefficient of Low-Pressure Glow Plasma Treated Water at Atmospheric and Reduced Pressure

2019

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This paper investigates the influence of low-pressure glow plasma water treatment on boiling phenomenon. The presented results show the novel influence and potential new applications of low-pressure glow plasma treated water. Low-pressure glow plasma water treatment affects some of its physical properties such as surface tension, pH, and electric conductivity; this is due to changes in the water structure. An experimental analysis aimed to investigate the effect of such a treatment on the boiling heat transfer coefficient of water, and to assess the stability of GPTW. The experiments were carried out at atmospheric and reduced pressure for heat fluxes up to 70 kW/m 2 . The analysis shows significant deterioration of the boiling heat transfer coefficient under reduced pressure. In addition, the plasma treatment process had no significant effect on the thermal conductivity of water, as confirmed experimentally. A slight increase was observed, but it was within the measuring error range of the instruments used.

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“…Absorption cooling technologies are an attractive option for the climatization of spaces because they can be driven by low-temperature thermal energy [7] without the use of large amounts of electrical energy [8], being able to use solar heating technologies as sources of activation [9]. In addition, they have great technological maturity, economic profitability, and high efficiency [10], as well as a great possibility of energy integration with other technologies to offer other services simultaneously, such as desalination [11].…”

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confidence: 99%

Simulation of a Solar-Assisted Air-Conditioning System Applied to a Remote School

et al. 2019

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In this work, we present an absorption cooling system with 35 kW capacity driven by solar thermal energy, installed in the school of Puertecitos, Mexico, an off-grid community with a high level of social marginalization. The cooling system provides thermal comfort to the school’s classrooms through four 8.75-kW cooling coils, while a 110-m2 field of evacuated tube solar collectors delivers the thermal energy needed to activate the cooling machine. The characteristics of the equipment installed in the school were used for simulation and operative analysis of the system under the influence of typical factors of an isolated coastal community, such as the influence of climate, thermal load, and water consumption in the cooling tower, among others. The aim of this simulation study was to determine the best operating conditions prior to system start-up, to establish the requirements for external heating and cooling services, and to quantify the freshwater requirements for the proper functioning of the system. The results show that, with the simulated strategies implemented, with a maximum load operation, the system can maintain thermal comfort in the classrooms for five days of classes. This is feasible as long as weekends are dedicated to raising the water temperature in the thermal storage tank. As the total capacity of the system is distributed in the four cooling coils, it is possible to control the cooling demand in order to extend the operation periods. Utilizing 75% or less of the cooling capacity, the system can operate continuously, taking advantage of stored energy. The cooling tower requires about 750 kg of water per day, which becomes critical given the scarcity of this resource in the community.

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A novel LiBr/H2O absorption cooling and desalination system with three pressure levels

Cited by 18 publications

References 26 publications

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

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

Pool Boiling Heat Transfer Coefficient of Low-Pressure Glow Plasma Treated Water at Atmospheric and Reduced Pressure

Simulation of a Solar-Assisted Air-Conditioning System Applied to a Remote School

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