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A distributed model for predicting the transient behaviour of a microfin tube evaporator.

Author(s) : KAPADIA R. G., JAIN S., AGARWAL R. S.

Summary

The microfin technology is gaining popularity because of it enhances heat transfer substantially without causing a large increase in pressure drop. It is known that, per unit tube length, heat transfer coefficients of helical microfin tubes are about twice as large as those for plain tubes. So in order to improve the thermal performance of the air-conditioning and the heat pump systems, the tube-fin heat exchangers of these systems are made of microfin tube with different diameter and geometries. This paper investigates the transient behaviour of the microfin tube evaporator for a window air conditioner charged with R-22 and R-410A as refrigerants. The simulation results include the comparison of transient behaviour of a smooth and microfin tube evaporator using R-22 and R-410A as refrigerants under the step increase and decrease in refrigerant mass flow rate. It is observed that due to the higher heat transfer coefficient for the microfin tube evaporator the liquid dry-out occurs 1.296 m earlier than the smooth tube. It is also observed that the step change in the refrigerant mass flow can control interface position to get uniform air temperature distribution of the coil.

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Pages: ICR07-E1-585

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Details

  • Original title: A distributed model for predicting the transient behaviour of a microfin tube evaporator.
  • Record ID : 2008-0549
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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