Heat transfer studies on a GAXAC (generator-absorber-exchange absorption compression) cooler

Rameshkumar, A.; Udayakumar, M.; Saravanan, R.

doi:10.1016/j.apenergy.2009.01.024

Cited by 23 publications

(6 citation statements)

References 11 publications

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“…It is seen from Fig .6 that the heat source temperature has significant impacts on the concentration difference and cycle ratio. In CAHP system, the cycle ratio has a large effect on COP [8], which means the heat source temperature also makes a big difference on COP. The simulation shows that when the concentration is at 65%, a high concentration difference about 10% can be obtained.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Performance of a Compression-absorption Heat pump System Driven by Low-temperature Geothermal Water

Qiu¹,

Leng²,

Wang³

et al. 2015

Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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This paper analyzes the performance of a compression-absorption heat pump (CAHP) system driven by low-temperature geothermal water. Two models, respectively, for the generator and whole system using ammonia-water as the working fluid are proposed. The results show that there is an optimum concentration around 65% for the system. The maximum of overall heat transfer coefficient can be obtained with optimum spray density between 0.13 and 0.19 kg•m-1 •s-1 of ammonia water solution. Operating with a high heat sink temperature between 70 and 85℃, and a low heat source temperature from 25 to 40℃, the COP of the system is above 4.

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Section: Resultsmentioning

confidence: 99%

“…The component in the CAHP system has a substantial influence on COP [6] . Several earlier studies showed the heat transfer coefficient of the generator in the test plant influences COP and other state variables, and COP increases sharply with improving heat transfer of generator [7] [8] . Hence, a proper design of generator is essential [9] .…”

mentioning

confidence: 98%

Performance of a Compression-absorption Heat pump System Driven by Low-temperature Geothermal Water

Qiu¹,

Leng²,

Wang³

et al. 2015

Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

View full text Add to dashboard Cite

show abstract

“…6 that the heat source temperature has significant impact on the concentration difference and cycle ratio. In the CAHP system the cycle ratio has a large effect on COP [13,14], which means the spray densities and the heat source temperature also makes a different influence on COP. When the concentration is 65%, a high concentration difference about 10% can be obtained.…”

Section: System Modelmentioning

confidence: 99%

“…The heat transfer coefficient of the generator has great influence on COP of the CAHP. Rameshkumar et al [13,14] studied a heat transfer model of aqua ammonia GAXAC system and the results showed that the COP increased sharply as heat transfer in the generator increased. Absorption /compression cycles were carried out in 1950 and research activities have increased rapidly since 1980, the design of the heat exchangers and compressors, and the choice of working fluids are evaluated [15].…”

Section: Introductionmentioning

confidence: 99%

Development of a compression-absorption heat pump system for utilizing low-temperature geothermal water

Gong¹,

Luo²,

Lu³

et al. 2017

THERM SCI

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Heat pump is an effective way to use the low temperature geothermal water with temperature lower than 50 ℃ for building heating. Compared to the conventional vapour compression heat pump, the compression-absorption heat pump (CAHP) can obtain higher heat sink temperature with lower compression ratio. Besides, the temperature glide in the generator and absorber of CAHP can be fitted to the heat source and heat sink, which achieves better coefficient of performance. Two models, respectively, for the generator and whole system using ammonia-water (NH 3-water) as the working fluid are proposed, and the effects of different concentration of strong solution, cycle ratios, heat source temperature and spray density on the generator are investigated. The objective is to analyse the performance of CAHP system driven by low temperature geothermal water. The results show that the maximum of overall heat transfer coefficient of the vertical out-tube falling film generator can be obtained with the optimum spray density of around 0.16 kg/ms and there is an optimum concentration of around 65% for the CAHP system. When the low heat source temperature between 30 ℃ and 40 ℃, the high heat sink temperature can reach to 65-70 ℃.

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“…Jelinek et al (2012) showed that triple pressure absorption cycle operated with mechanical compressor increases the COP and decreases the circulation ratio. Rameshkumar et al (2009) analysed 1 TR hybid cooler and claimed that the COP is 27 percent higher than the conventional cycle. Velázquez et al (2010) has been carried out using a Linear Fresnel Reflector Concentrator (LFRC) as generator in Solar-GAX cycle and found that efficiency calculated is 17.9% higher than a single effect water-lithium bromide cycle coupled in an indirect form with a Parabolic Trough Solar Collector system.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Hybrid Absorption Compression System

Kumar¹,

2018

IJET

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The Virtual Reality realistic image content is a technology to enable building imaginary space by This paper presents thermodynamic studies conducted on a GAX hybrid absorption-compression (HYBRID) cycle using ammonia-water as working ﬂuid for air-conditioning applications. The effect of generator, condenser and absorber temperatures on exergy destruction has been investigated. The effect of absorber pressure on the exergy destruction of the cycle has also been studied. It is found that generator and absorber are the major contributors in the total exergy destruction of the hybrid cycle. Comparison of hybrid cycle with conventional GAX cycle shows hybrid cycle has lower value of exergy destruction than the conventional GAX cycle. It is also found that at same thermal conditions assumed in this work the hybrid cycle gives 18 percent increases in average exergetic efficiency when compared to the conventional GAX cycle.

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Heat transfer studies on a GAXAC (generator-absorber-exchange absorption compression) cooler

Cited by 23 publications

References 11 publications

Performance of a Compression-absorption Heat pump System Driven by Low-temperature Geothermal Water

Performance of a Compression-absorption Heat pump System Driven by Low-temperature Geothermal Water

Development of a compression-absorption heat pump system for utilizing low-temperature geothermal water

Thermodynamic Analysis of Hybrid Absorption Compression System

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