Experimental study of an ammonia–water bubble absorber using a plate heat exchanger for absorption refrigeration machines

Cerezo, J.; Bourouis, Mahmoud; Vallès, Manel; Coronas, Alberto; Best, R.

doi:10.1016/j.applthermaleng.2008.05.012

Cited by 63 publications

(22 citation statements)

References 6 publications

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“…Type 15-2 was built in the TRNSYS software to simulate a year's environmental conditions obtained from meteorological data in Temixco city, Mexico. Figure 4 Energies 2018, 12, 259 8 of 19 shows the environment temperature and global radiation profiles across a year. The period from March to May (1460-3560 h) was selected to operate the absorption system due to the highest ambient temperature in a year (blue box).…”

Section: Operation Range Of the Auxiliary System (As)mentioning

confidence: 99%

“…Energies 2018, 11, x FOR PEER REVIEW 8 of 19 ACS could fall into the crystallization zone or low COP depending on the environmental temperature. COP is defined as the ratio of the energy absorbed in the evaporator to the energy supplied by the generator.…”

Section: Operation Range Of the Auxiliary System (As)mentioning

confidence: 99%

“…The ACS (Figure 1b) simulation was based on simple mass and energy balances for each component [19] programmed in the EES software. The suppositions are described as follows:…”

Section: Conflicts Of Interestmentioning

confidence: 99%

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Dynamic Simulation of an Absorption Cooling System with Different Working Mixtures

et al. 2018

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High consumption of electricity represents an economic and social problem in warm places, caused by the massive use of cooling machines. Absorption systems are a sustainable method for air conditioning applications. However, environmental conditions should be analyzed to avoid crystallization problems of the working mixture. This article presents a thermal analysis of a solar absorption cooling system in dynamic conditions using NH 3 -H 2 O, H 2 O-LiBr, NH 3 -NaSCN, NH 3 -LiNO 3 , and H 2 O-LiCl working mixtures using Equation Engineering Solver (EES) and TRaNsient SYstem Simulation (TRNSYS) software. A solar collector area of 42.5 m 2 was selected to carry out the thermal analysis. The results showed that H 2 O-LiCl obtained the maximum solar (0.67) and minimum heating (0.33) fraction. However, it obtained the maximum lost heat fraction (0.12), in spite of obtaining the best coefficient of performance (COP) among the other working mixtures, due mainly to a crystallization problem. The gain fraction (GF) parameter was used to select the adequate solar collector number for each working mixture. NH 3 -LiNO 3 and NH 3 -H 2 O obtained the highest GF (up 6), and both obtained the maximum solar (0.91) and minimum heating (0.09) fraction, respectively, using 88.8 and 100.4 m 2 of solar collector area, respectively.

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Section: Operation Range Of the Auxiliary System (As)mentioning

confidence: 99%

Section: Operation Range Of the Auxiliary System (As)mentioning

confidence: 99%

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Dynamic Simulation of an Absorption Cooling System with Different Working Mixtures

et al. 2018

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“…Table 3 shows the experimental data without absorption process. The average heat load per area (Q AVE ) was higher with HM (1.40 kW/m 2 ) than ST (1.17 kW/m 2 ), in spite that the solution concentration in SP is lower than HM [15]. This represents an increment of 16%.…”

Section: Resultsmentioning

confidence: 93%

“…∆T ML,EQ is the logarithmic mean temperature difference at equilibrium conditions to avoid subcooling conditions due to the absorption heat [15]. The heat released by the ammonia vapor bubble was calculated from an interfacial energy balance in the vapor and liquid phase from Equations (8) and (9) …”

Section: Governing Equationsmentioning

confidence: 99%

A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer

et al. 2017

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Abstract:The heat transfer in double pipe heat exchangers is very poor. This complicates its application in absorption cooling systems, however, the implementation of simple passive techniques should help to increase the heat and mass transfer mainly in the absorber. This paper carried out a simulation and its experimental comparison of a NH 3 -H 2 O bubble absorption process using a double tube heat exchanger with a helical screw static mixer in both central and annular sides. The experimental results showed that the absorption heat load per area is 31.61% higher with the helical screw mixer than the smooth tube. The theoretical and experimental comparison showed that the absorption heat load difference values were 28.0 and 21.9% for smooth tube and the helical mixer, respectively. These difference values were caused by the calculation of the log mean temperature difference in equilibrium conditions to avoid the overlap of solution temperatures. Therefore, the theoretical and experimental results should be improved when the absorption heat is included in the heat transfer equation or avoiding the operation condition when output is lower than input solution temperature.

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R134a-DMF Vapour Absorption Refrigeration System (VARS) with Plate Heat Exchangers

Mitkari

Ronge²,

Pratik

2019

Techno-Societal 2018

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Experimental study of an ammonia–water bubble absorber using a plate heat exchanger for absorption refrigeration machines

Cited by 63 publications

References 6 publications

Dynamic Simulation of an Absorption Cooling System with Different Working Mixtures

Dynamic Simulation of an Absorption Cooling System with Different Working Mixtures

A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer

R134a-DMF Vapour Absorption Refrigeration System (VARS) with Plate Heat Exchangers

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