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Multi-Effect Plants and Ionic Liquids for Improved Absorption Chillers

Title data

Weith, Theresa ; Preißinger, Markus ; Pöllinger, Simon ; Brüggemann, Dieter:
Multi-Effect Plants and Ionic Liquids for Improved Absorption Chillers.
In: Heat Transfer Engineering. Vol. 35 (2014) Issue 16-17 . - pp. 1462-1472.
ISSN 1521-0537
DOI: https://doi.org/10.1080/01457632.2014.889474

Official URL: Volltext

Abstract in another language

State-of-the-art absorption chillers using conventional working pairs still suffer from problems like crystallization, corrosiveness, and a relatively low efficiency. To improve this technology, different working pairs as well as plant designs are investigated using the simulation tool AspenPlus. The simulation is validated by comparing the results of single-effect absorption chillers using the current commercially applied working pairs water/lithium bromide and ammonia/water with literature data. To increase the efficiency, double-effect absorption chillers are implemented and analyzed. The performance of two kinds of double-effect cycles, series and parallel, is compared using the working pair water/lithium bromide. In addition, ionic liquids (ILs) are investigated as a sorbent in order to improve the technology. So far, ILs have not been implemented in AspenPlus yet. Therefore, a guideline for the implementation of ILs in AspenPlus is outlined and the accordant phase equilibria results are validated with literature data. Simulations of single-effect cycles using the ILs 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) and 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) in combination with water as a refrigerant are performed and the results are compared to conventional working pairs. It is shown that by using ILs, similar or even higher coefficients of performance (COPs) can be achieved in comparison to conventional working pairs. Moreover, the findings reveal that the main benefit of using ILs as a sorbent consists in providing a broader operating range with respect to heat source temperature.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Special Issue: Selected Papers Presented at the 9th International Conference on Heat Transfer, Fluid Mechanics, and Thermodynamics (HEFAT2012), July 16-18, 2012, Malta
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profile Fields
Profile Fields > Emerging Fields
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 27 Nov 2015 08:29
Last Modified: 28 Feb 2019 09:37
URI: https://eref.uni-bayreuth.de/id/eprint/23030