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A discussion about the methodology to validate the correlations of heat transfer coefficients and pressure drop during the condensation in a finned tube heat exchanger.

Number: pap. 2227

Author(s) : PISANO A., MARTÍNEZ-BALLESTER S., CORBERÁN J. M., et al.

Summary

The purpose of this work is discuss about the best way for validating a model able to predict the performance of a finned-tube condenser. A simulation tool has been used in order to analyze the effects on the model prediction of some correlations intended to the evaluation of the heat transfer coefficients (HTC) and pressure drop (PD) of both refrigerant and air side. The discussion is supported by an experimental set of data obtained by testing a traditional air-to-water heat pump equipped with a finned round tube condenser. The test campaign has been designed in order to cover a wide range of operating points including different air velocities (from 1.5 m/s to 4 m/s), refrigerant mass flow rate (50.4-82.2 kg/h), air inlet temperatures (20-46°C) and subcooling (0-5-10 K). Once defined the classic boundary conditions for validating a model, such as the condenser inlet conditions (temperature and pressure) and the mass flow rate, the predicted capacity is compared against the experimental one. In the paper an alternative set of boundary conditions is proposed and the results have been compared with experimental ones in terms of condenser temperature and capacity. The analysis of statistical parameters such as Mean Error (ME), Standard Deviation (SD) and Mean Square Error (MSE) allows demonstrating how a good combination of inlet parameters and correlations makes possible a very good agreement between the model and the experimental data without using any enhancement factors.

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Pages: 10 p.

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Details

  • Original title: A discussion about the methodology to validate the correlations of heat transfer coefficients and pressure drop during the condensation in a finned tube heat exchanger.
  • Record ID : 30013197
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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