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Alternative alcohol blends as secondary fluids for ground source heat pumps
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0001-8516-0609
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-3490-1777
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
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2016 (English)In: Refrigeration Science and Technology, International Institute of Refrigeration , 2016, 610-617 p.Conference paper, Published paper (Refereed)
Abstract [en]

The most common secondary fluid used for the borehole heat exchangers in Sweden is an aqueous solution of ethyl alcohol (EA) due to its relatively good thermophysical properties and low toxicity. Commercially available ethyl alcohol based fluids in Sweden contain up to 10 wt-% denaturing agents in form of propyl alcohol (PA) and n-butyl alcohol (BA). The aim of this paper was to investigate the performance of the existing ethyl alcohol blend containing two denaturing agents and alternative alcohol blends in terms of the pressure drop and heat transfer in the BHE and comparison with ethyl alcohol based secondary fluid. Experimental results showed that the presence of these denaturing agents improves thermophysical properties such as specific heat capacity, thermal conductivity and dynamic viscosity when added in small concentration. EA18 + PA1.6 + BA0.4 and EA18.4 + PA1.6 present the best characteristics in terms of the heat transfer and pressure drop. Both blends are giving higher heat transfer coefficient by 9.4 % (EA18 + PA1.6 + BA0.4) and 8.11 % (EA18.4 + PA1.6) than pure EA20. Both blends are giving as well lower pressure drop than EA20 by up to 2.7 % (EA18 + PA1.6 + BA0.4) and 3 % (EA18.4 + PA1.6). EA18 + PA1.6 + BA0.4 gives 1.4 % higher heat transfer coefficient and EA18.4 + PA1.6 gives lower pressure drop by up to 0.4 % when these two blends are compared.

Place, publisher, year, edition, pages
International Institute of Refrigeration , 2016. 610-617 p.
Keyword [en]
Borehole heat exchanger, Denaturing agents, Ethyl alcohol, Ground source heat pump, Propyl alcohol, Secondary fluid, Denaturation, Drops, Ethanol, Fluids, Heat exchangers, Heat pump systems, Heat transfer, Heat transfer coefficients, IIR filters, Pressure drop, Solutions, Specific heat, Thermodynamic properties, Borehole heat exchangers, Dynamic viscosities, Heat transfer and pressure drop, N-Butyl alcohols, Propyl alcohols, Secondary fluids, Small concentration, Geothermal heat pumps
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207532DOI: 10.18462/iir.gl.2016.1098ISI: 000402544400074Scopus ID: 2-s2.0-85017581159ISBN: 9782362150180 (print)OAI: oai:DiVA.org:kth-207532DiVA: diva2:1103846
Conference
12th IIR Gustav Lorentzen Natural Working Fluids Conference, GL 2016, 21 August 2016 through 24 August 2016
Note

Conference code: 126956; Export Date: 22 May 2017; Conference Paper; Funding details: Energimyndigheten; Funding text: The Swedish Energy Agency, Effsys Expand project and all industrial partners are greatly acknowledged for financing this project. QC 20170531

Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-06-30Bibliographically approved

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Ignatowicz, MonikaMazzotti, W.Acuña, JoséMelinder, A.Palm, Björn
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CiteExportLink to record
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Citation style
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