A novel concept for heat transfer fluids used in district cooling systems

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Low-temperature phase-change materials (PCMS) were mixed with water to enhance the performance of heat transfer fluid. Several PCMs were tested in a laboratory-scale test loop to check their suitability to district cooling applications. The phase-change temperatures and latent heats of fusion of tetradecane, pentadecane, and hexadecane paraffin waxes were measured using a differential scanning calorimeter. The heat of fusion of these materials is approximately 60% of that of ice. They exhibit no supercooling and are stable under repeated thermal cycling. For 10% and 25% PCM-water slurries, the heat transfer enhancement was found to be approximately 18 and 30 percent over ... continued below

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Pages: (13 p)

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Cho, Y.I.; Choi, E. & Lorsch, H.G. January 4, 1991.

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Description

Low-temperature phase-change materials (PCMS) were mixed with water to enhance the performance of heat transfer fluid. Several PCMs were tested in a laboratory-scale test loop to check their suitability to district cooling applications. The phase-change temperatures and latent heats of fusion of tetradecane, pentadecane, and hexadecane paraffin waxes were measured using a differential scanning calorimeter. The heat of fusion of these materials is approximately 60% of that of ice. They exhibit no supercooling and are stable under repeated thermal cycling. For 10% and 25% PCM-water slurries, the heat transfer enhancement was found to be approximately 18 and 30 percent over the value of water, respectively. It was also found that, in the turbulent region, there is only a minor pumping penalty from the addition of up to 25% PCM to the water. It was demonstrated that pentadecane does not clog in a glass-tube chiller, and continuous pumping below its freezing, point (9.9[degrees]C):was successfully carried out in a bench-scale flow loop. Adding PCM to water increases the thermal capacity of the heat transfer fluid and therefore decreases the volume that needs to be pumped in a district cooling system. It also increases the heat transfer rate, resulting in smaller heat exchangers. Research is continuing on these fluids in order to determine their behavior in large-size loops and to arrive at optimum formulations.

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Pages: (13 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE93013298
  • Report No.: DOE/CE/26602-1
  • Grant Number: FG01-90CE26602
  • DOI: 10.2172/6527230 | External Link
  • Office of Scientific & Technical Information Report Number: 6527230
  • Archival Resource Key: ark:/67531/metadc1207852

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 4, 1991

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • July 30, 2018, 4:49 p.m.

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Cho, Y.I.; Choi, E. & Lorsch, H.G. A novel concept for heat transfer fluids used in district cooling systems, report, January 4, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1207852/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.