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In this paper, pressure drop in a capillary tube is modeled to determine the length of a capillary tube used in residential air conditioners. HCFC22 and its alternatives, HFC134a, R407B, 50%R32/50%R125 are used as the working fluids. The model is tested under the following conditions: condensing temperature; 40, 45, 50, 55℃, degree of subcooling; 0, 2.5, 5℃, capillary tube exit condition; choked flow, capillary tube diameter; 1.2~2.4㎜, mass flow rate; 5~50g/sec. The results justify the use of Stoecker's model which yields the predicted values close to the ones in the ASHRAT handbook. McAdams' model yields much better results than Duckier's for the calculation of the viscosity of the fluid in the two phase and Stoecker's equation seems best for the calculation of the viscosity of the fluids in capillary tubes with large diameters. For each refrigerant, 372 data under different conditions are calculated by the model. The results show that the capillary tube length varies very uniformly with changes of condensing temperature and degree of subcooling. Based on this fact, regression analysis is performed to determine the dependence of mass flow rate on the length and diameter of a capillary tube, condensing temperature, and degree of subcooling. The determined correlation yields a mean deviation of 2.36% for 1488 data obtained for two pure fluids and two mixtures, showing an excellent agreement.

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Abstract

1. Introduction

2. Capillary Tube Modeling

3. Results and Discussion

4. Conclusions

Acknowledgement

References

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UCI(KEPA) : I410-ECN-0101-2009-553-015261022