Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-10429
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Main Title: Performance of absorption chillers in field tests
Author(s): Hüls Güido, Walther
Lanser, Wolfgang
Petersen, Stefan
Ziegler, Felix
Type: Article
Language Code: en
Abstract: Absorption chillers can use waste heat, solar heat, or excess heat by cogeneration facilities to supply chilled water. Therefore, absorption chillers are important components for poly-generation, which can improve plant utilization and efficiency of the overall energy supply system. Currently, 27 new small and medium-scale (30–160 kW cooling capacity) absorption chillers with high efficiency in full- and part-load as well as low specific size and weight are the focus of two research projects sponsored by German Federal Ministries. The chillers are located in 20 different sites, four of them in Jordan and the rest in Germany. The main objective of these projects is to enhance trigeneration and solar cooling system efficiency. The Jordan projects and more than 70% of the German installations use dry cooling towers. Combined heat and power (CHP) plants or district heating grids provide the driving heat for regeneration at the German installations. Solar thermal collectors drive one German and all Jordan installations. Within the projects, the chillers are provided with an intelligent control algorithm that allows achieving several objectives at the same time. One of the objectives, of course, is to match the desired chilled water temperature as well as the cooling capacity. Another objective is, for instance, to fit the hot water outlet temperature. This is commonly essential in cogeneration to avoid emergency shutdowns of the CHP engine. The field operation shows that the deviation of said temperatures from the set point is usually less than ±0.5 K in operation. In those operational hours in which the temperatures of the heat source or heat sink do not allow to reach all objectives, a set of hierarchical aims can be established within the algorithm so that the chiller can be controlled to match its prioritized objectives. Furthermore, the designed absorption chiller performs dynamically and autonomously in a very large range of temperatures and flow rates. These can vary from 20% up to 150% of nominal conditions. This flexibility can be used to achieve up to 80% savings of electrical power consumption using speed-controlled pumps in part load conditions. In contrast to the common opinion that small and medium-scale absorption chillers are not competitive as compared to compression chillers, this paper shows applications in which absorption chillers are advantageous because of synergies with and multiple benefits within the rest of the energy supply system.
URI: https://depositonce.tu-berlin.de/handle/11303/11544
http://dx.doi.org/10.14279/depositonce-10429
Issue Date: 5-Feb-2018
Date Available: 1-Aug-2020
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): system efficiency
trigeneration
Combined Cooling Heat and Power
CCHP
solar cooling
dry cooling towers
thermally driven cooling
Kraft-Wärme-Kälte-Kopplung
KWKK
License: https://creativecommons.org/licenses/by-nc-nd/4.0/
Journal Title: Applied Thermal Engineering
Publisher: Elsevier
Publisher Place: Amsterdam
Volume: 134
Publisher DOI: 10.1016/j.applthermaleng.2018.02.013
Page Start: 353
Page End: 359
EISSN: 1873-5606
ISSN: 1359-4311
Appears in Collections:FG Maschinen- und Energieanlagentechnik » Publications

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