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Experimental study of semi-clathrate hydrate slurry in a coil heat exchanger.

Number: pap. n. TP-026

Author(s) : VASILESCU C., INFANTE FERREIRA C.

Summary

Air conditioning systems represent a large percentage of energy consumption and greenhouse gases emissions of the building sector. The distribution of cold of these systems could be improved by using two-phase fluids which are more energy efficient because of the latent heat of the solid/liquid phase change. Recently several quaternary salts such as tetrabutylammonium bromide (TBAB) have been proposed for air conditioning applications because their phase change takes place at atmospheric pressure and temperatures above the freezing point of water. This paper is concerned with the experimental analysis of a coil heat exchanger with 6 mm internal diameter with TBAB hydrate slurry.A mixture of 36.5 wt % TBAB and water is cooled at temperatures from 15°C to 10°C until the hydrates forming conditions are reached. The temperature raises when hydrates appear. The pressure drop starts to increase when the hydrates are formed because of the increased viscosity of the fluid. Heat transfer coefficients and pressure drops of 25-45 wt % TBAB hydrate slurry are presented. Local heat transfer correlations are derived from the experiments.

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Pages: 8 p.

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Details

  • Original title: Experimental study of semi-clathrate hydrate slurry in a coil heat exchanger.
  • Record ID : 30008103
  • Languages: English
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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