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Experimental investigation of thermophysical properties of ethylene glycol based secondary fluids
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0001-8516-0609
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
2023 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 155, p. 137-153Article in journal (Refereed) Published
Abstract [en]

Aqueous solutions of ethylene glycol are commonly used as secondary fluids in different indirect refrigeration systems and heat pumps as well as nanofluids. A very extensive literature review has been done, including more than 90 references published from 1905 to 2023. Despite the wide application and importance, especially in the energy sector, ethylene glycol solutions seem to be less investigated in low temperature ranges and more research is required to improve the quality and quantity of available data. The novelty of this paper is to investigate the most important thermophysical properties of ethylene glycol solutions in low temperatures. In this study a different approach was made and solutions having a specific freezing point temperature (between -5 and -50 ºC) rather than specific concentration were investigates in temperature ranges applicable for different cooling applications. The concentrations giving a certain freezing point temperature seemed to deviate in some cases with 1–2 wt-% between different sources. Nevertheless, the density results were in rather good agreement with all reference data. The viscosity results were lower by up to ±10% compared to reference values. Additionally, the obtained experimental results for thermal conductivity were higher by up to 12% compared to ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) data. The specific heat capacity results were higher by up to 14.6% and 5.4% than current reference data. There is a high probability that the current ASHRAE data for specific heat are actually indirectly calculated values from thermal conductivity data and not validated using differential scanning calorimetry techniques.

Place, publisher, year, edition, pages
Elsevier BV , 2023. Vol. 155, p. 137-153
Keywords [en]
Ethylene glycol, indirect Refrigeration system, Secondary fluid, Thermophysical properties
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-338342DOI: 10.1016/j.ijrefrig.2023.08.008ISI: 001098982100001Scopus ID: 2-s2.0-85173242222OAI: oai:DiVA.org:kth-338342DiVA, id: diva2:1806309
Note

QC 20231020

Available from: 2023-10-20 Created: 2023-10-20 Last updated: 2023-11-30Bibliographically approved

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Ignatowicz, MonikaPalm, Björn

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