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Shell and tube gas coolers for carbon dioxide heat pump applications.

Number: pap. n. TP-050

Author(s) : ZILIO C., MANCIN S.

Summary

This paper experimentally compares the heat transfer performance of four different shell-and-tube gas coolers implemented in a R744 water/water heat pump (5 kW heating power,0¡C evaporation temperature, 10MPagas cooler pressure, 35 ¡C gas cooler outlet temperature) controlled by a back pressure valve as expansion device. The tubes bundle consists of 10 tubes in a 30¡ arrangements for all the gas coolers, which use different tube geometries: smooth, corrugated, internally grooved and corrugated and internally grooved tubes, respectively. The experimental results are carried out at fixed gas cooler inlet water temperature (25¡C) and by imposing two inlet gas cooling pressures of 8 MPa and 10 MPa. The water flow rate is varied between 160 and 700 l h-1in order to study the shell side heat transfer performance. On the basis of the experimental measurements, the heat transfer performance of the four shell-and-tubes gas coolers are compared in terms of overall heat transfer coefficient. Furthermore, a step-by-step procedure for the simulation of the heat transfer cooling process of the carbon dioxide in shell and tubes gas coolers is proposed and validated against the experimental results.

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Pages: 8 p.

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Details

  • Original title: Shell and tube gas coolers for carbon dioxide heat pump applications.
  • Record ID : 30008275
  • Languages: English
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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