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Numerical model for matching of coiled adiabatic capillary tubes in a split air conditioner using HCFC-22 and HC-290.

Author(s) : ZHOU G., ZHANG Y., YANG Y., et al.

Type of article: Article

Summary

This work presents a simple model for matching coiled capillary tubes and the refrigerant charge in a split air conditioner when the other components are fixed. The system model is composed of sub-models for the key components, i.e., a lumped model for the compressor, zone models for the condenser and the evaporator, and a four flow region distributed model for the coiled adiabatic capillary tube in series with the liquid tube. The C-M-N method is employed to calculate the friction factors in the coiled capillary tube. HCFC-22 and HC-290 are used for the simulations. The comparison of the model prediction with experimental data shows the errors are less than ±5% except for the mass flow rate with a maximum deviation of 8.63%. The results confirm that both the cooling capacity and input power are slightly reduced when HCFC-22 is replaced by HC-290 with the coiled capillary tube and refrigerant charge matched to the HC290 refrigerant. The results also show that when coil diameter is reduced from 0.3 m to 0.04 m, the capillary tube length is reduced by about 10% for both HCFC-22 and HC-290. This model can be used to design components for small air conditioning systems using HCFC22 and HC290. [Reprinted with permission from Elsevier. Copyright, 2010].

Details

  • Original title: Numerical model for matching of coiled adiabatic capillary tubes in a split air conditioner using HCFC-22 and HC-290.
  • Record ID : 30001468
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 30 - n. 11-12
  • Publication date: 2010/08
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2010.03.009

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