Pipe internal recirculation in storage connections - An unseen efficiency barrier

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Steinweg, J.; Kliem, F.; Littwin, M.; Rockendorf, G.: Pipe internal recirculation in storage connections - An unseen efficiency barrier. In: Energy Procedia 73 (2015), S. 341-349. DOI: https://doi.org/10.1016/j.egypro.2015.07.704

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Sum total of downloads: 32

Basically, pipe internal recirculation (PIR) at storage connections is a known phenomenon. However, it is not sufficiently considered by storage manufacturers and installers. There is still a lack of awareness and quantification of the PIR effect in typical installations and practice-oriented solutions. Within this paper, the final results of a research project aiming at the detailed qualitative description and quantification of the effect including extrapolation of the results regarding the PIR impact on storage heat losses are presented. This includes the results regarding the influence of the pipe's material (copper, stainless steel, plastic), diameter, insulation and connection type (direct to storage, indirect via immersed or external heat exchanger) on PIR including their effects on the overall heat losses of ready installed storage tanks. Derived from generalized measurements, a calculation method has been developed, which enables to determine the annual heat losses caused by PIR in domestic hot water storages using dynamic system simulations (TRNSYS). In conclusion, different measures for the reduction of PIR induced heat losses and their effectiveness may be presented. © 2015 The Authors.
License of this version: CC BY-NC-ND 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2015
Appears in Collections:An-Institute

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pos. country downloads
total perc.
1 image of flag of Germany Germany 19 59.38%
2 image of flag of United States United States 6 18.75%
3 image of flag of France France 2 6.25%
4 image of flag of Canada Canada 2 6.25%
5 image of flag of No geo information available No geo information available 1 3.12%
6 image of flag of Netherlands Netherlands 1 3.12%
7 image of flag of United Kingdom United Kingdom 1 3.12%

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