Absorption refrigeration processes with organic working fluid mixtures- a review

Παπαδόπουλος, Αθανάσιος Ι.; Kyriakides, Alexios-Spyridon; Seferlis, Panos; Hassan, Ibrahim

doi:10.1016/j.rser.2019.04.016

Cited by 50 publications

(22 citation statements)

References 103 publications

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“…Published research efforts document working fluids that include inorganics (Sun et al, 2012), ionic liquids (Khamooshi et al, 2013), and organics (Papadopoulos et al, 2019). The most widely considered inorganic options include H 2 O/LiBr and NH 3 /H 2 O, which are the only fluids that are used in commercial-level applications (Papadopoulos et al, 2019). The negligible vapor pressure of LiBr makes it a very good absorbent and simplifies the operation of the ABR as the separation of the mixture during heat addition is easy.…”

Section: Introductionmentioning

confidence: 99%

“…However, salt mixtures exhibit crystallization issues if the ABR operation exceeds specific concentration limits, whereas the use of H 2 O as a refrigerant prohibits generation of cooling below 0°C (Ghafoor and Munir, 2015). The latter may be overcome using NH 3 as a refrigerant, however it generally exhibits toxicity issues and requires efficient separation from water during heat addition (Papadopoulos et al, 2019). Ionic liquids represent a promising type of fluids as absorbents due to their negligible vapor pressure (Khamooshi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Ionic liquids represent a promising type of fluids as absorbents due to their negligible vapor pressure (Khamooshi et al, 2013). However, only very few such fluids have been investigated in the past (Khamooshi et al, 2013), while they generally exhibit high viscosity and are much more expensive than other options (Papadopoulos et al, 2019). Organics have received attention in published literature as alternatives to the two commercial options (recent review in (Papadopoulos et al, 2019)).…”

Section: Introductionmentioning

confidence: 99%

“…However, only very few such fluids have been investigated in the past (Khamooshi et al, 2013), while they generally exhibit high viscosity and are much more expensive than other options (Papadopoulos et al, 2019). Organics have received attention in published literature as alternatives to the two commercial options (recent review in (Papadopoulos et al, 2019)). They have the potential to overcome the disadvantages of inorganics and ionic liquids and to exhibit higher performance in terms of ABR costs, health, safety and environmental impacts.…”

Section: Introductionmentioning

confidence: 99%

“…They have the potential to overcome the disadvantages of inorganics and ionic liquids and to exhibit higher performance in terms of ABR costs, health, safety and environmental impacts. They have not been considered in commercial implementations because only very few options have been investigated as refrigerants or absorbents (Papadopoulos et al, 2019). The consideration of few organic fluid mixtures in ABR literature is due to the predominant use of trial-and-error approaches in their selection.…”

Section: Introductionmentioning

confidence: 99%

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Integrated Design of Working Fluid Mixtures and Absorption Refrigeration Cycles

et al. 2021

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This work presents a CAMD (computer-aided molecular design) approach for the design of working fluid mixtures used in ABR (absorption refrigeration) cycles. Compared to previous works, the proposed approach introduces two major improvements. It employs for the first time an ABR process model in the course of CAMD, hence enabling the evaluation of the generated mixtures considering process performance indicators. It enables for the first time the simultaneous generation and evaluation of molecular structures for both refrigerants and absorbents. The employed model and CAMD optimization problem formulation incorporates major ABR operational driving forces pertaining to efficient refrigeration, sufficient solubility of mixture components and ease of separation in the generator. The approach employs a multicriteria assessment methodology both during CAMD and for the evaluation of selected mixtures using a more rigorous ABR model at a second stage. The work identifies novel mixtures, with Acetaldehyde/2-Methoxyethyl acetate and Acetaldehyde/Methanediol exhibiting the highest performance. The latter exhibits 3% higher COP (coefficient of performance) and cooling output than the reference mixture NH3/H2O, whereas it operates at 87 and 89% lower high and low cycle pressures. The novel mixtures are also compared with novel mixtures previously identified through a heuristic approach by the authors. The latter mixtures indicate overall higher ABR performance but similar or worse performance in safety, health and environmental impact indices. Further performance improvements may be achieved by including into CAMD additional chemical groups to be able to simulate the complex absorbent structures available in published works.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated Design of Working Fluid Mixtures and Absorption Refrigeration Cycles

et al. 2021

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Techno‐economic assessment of novel and conventional working fluid mixtures for two‐stage double‐ and triple‐effect absorption refrigeration systems

et al. 2021

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This work presents a systematic techno-economic assessment of 84 conventional and novel working fluid mixtures in two-stage, double-and triple-effect (Kangaroo) absorption refrigeration cycles. Rectifiers are modeled as staged distillation columns to capture appropriately the separation tasks. All mixtures are first evaluated based on process operating performance indicators including the coefficient of performance, the exergy efficiency, the cycle high pressure, the refrigerant and absorbent total flowrates, the total number of stripping stages and the distillate-to-feed ratios, subject to constraints ensuring feasible operation. The distillate-to-feed ratio, the number of stages in each rectifier and the individual flows of the refrigerant and the absorbent in different cycle circuits are considered as design parameters. The evaluation considers wide operating ranges, to identify the conditions that result in optimum values for the employed indicators. A multi-criteria approach is used to generate few, highly performing candidates which are further evaluated using economic criteria. A mixture of acetaldehyde/dimethylformamide is selected as the best performing working fluid which exhibits at best 39% lower cost per ton of cooling and 7% higher coefficient of performance than NH 3 /H 2 O in the tripeeffect cycle, with similar high performance observed in the double-effect cycle too. The same mixture exhibits at best 38% lower coefficient of performance and 1% lower cost per ton of cooling than H 2 O/LiBr.

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