Performance improvement of absorption heat transformer

Sözen, Adnan; Yücesu, H. Serdar

doi:10.1016/j.renene.2006.01.017

Cited by 48 publications

(14 citation statements)

References 24 publications

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“…Sozen et al developed a mathematical model for ejection-absorption heat transformer to simulate the performance of these systems [2]. They showed that COP and ECOP in the studied systems are improved by using an ejector located at the absorber inlet.…”

Section: Introductionmentioning

confidence: 99%

Exergoeconomic Performance Comparison and Optimization of Single-Stage Absorption Heat Transformers

et al. 2017

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Three single-stage absorption heat transformer (SSHT) configurations are modeled, analyzed and compared from the viewpoints of thermodynamics and economics, using the Engineering Equation Solver (EES) software. In addition, a multi-objective optimization is carried out for the three configurations to specify the optimal design point considering the second law efficiency and the product unit cost as two objective functions. The configurations differ from one another considering the number of heat exchangers used in them. The results show that the coefficient of performance (COP) and exergy coefficient of performance (ECOP) for configuration 3 are around 35% and 30% higher than the corresponding values for configuration 1, respectively. Also, configuration 2 is found to be more economic with a product unit cost of about 21% and 5% lower than those for configurations 1 and 3, respectively. Furthermore, it is observed that relatively higher absorber temperatures can be achieved by configurations 2 and 3 compared to configuration 1. It is concluded from the multi-objective optimization that the conditions at which the evaporator, condenser and absorber temperatures are 86.51 • C, 39.03 • C and 123.1 • C, respectively, represents an optimal solution.

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Section: Introductionmentioning

confidence: 99%

Exergoeconomic Performance Comparison and Optimization of Single-Stage Absorption Heat Transformers

et al. 2017

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“…The AHT system can effectively recover about 50% of this waste heat and give an opportunity to reuse it in industrial processes. Since the AHT system is essentially the same as the AHP, it has all the advantages that the absorption systems have, such as, because it mostly requires heat energy and only little mechanical energy for the pumps, there is a possibility of running it with waste heat sources, as well as the solar energy, the only moving parts are pumps means quietness, less maintenance, less mechanical work input, long life, simple design and easy and long operation [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Single stage and double absorption heat transformers in an industrial application

Horuz

Kurt

2009

Int. J. Energy Res.

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SUMMARYAn industrial application of the single stage and double absorption heat transformer (AHT) systems using water-lithium bromide solutions with water as the refrigerant was analyzed. First, a basic single stage AHT system was described, the operating sequence was explained and thermodynamic system analysis was presented. Next, an application of the single stage AHT system to an industrial company was analyzed. A computer code was prepared to determine the effect of different parameters on the AHT system performance and the results were presented in graphical form. Additionally, the series and parallel double absorption AHT systems were introduced, the operating sequences were explained and thermodynamic system analysis was included. All results were presented in tabular form for comparison. It is concluded that about 50% of the waste heat can be utilized and the hot process water and vapor could be produced by applying single stage and double AHT systems, respectively. The parallel double AHT system could generate more vapor than the series double AHT system.

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“…1). It has been demonstrated that considerable energy savings and a reduction in fuel requirements may be achieved if installed in suitable facilities [7], and it is for these reasons that heat transformers have been called 'future technology which will be important for energy utilization in the 21st century' by the IEA [8].…”

Section: Introductionmentioning

confidence: 99%

“…Although AHTs may enable significant energy savings at minimum operating costs [9], only very few of these systems are currently in industrial use [8]. The majority of studies which have been conducted to date focus primarily upon the thermodynamic performance of the system.…”

Section: Introductionmentioning

confidence: 99%