Reducing the mass of the refrigerant in the capillary tube of a propane air-conditioner

Tangalajuk Siang, Jeri and Sharifian, Ahmad (2013) Reducing the mass of the refrigerant in the capillary tube of a propane air-conditioner. In: 14th Asian Congress of Fluid Mechanics (14 ACFM), 15-19 Oct 2013, Hanoi, Vietnam.

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Hydrocarbon refrigerants are environmentally friendly and many countries have started using them in refrigeration and air-conditioner systems. Propane, a typical hydrocarbon, does not damage the ozone layer and its effect on global warming is very small. Use of propane as a refrigerant is gaining favour, especially in systems designed for R-22. The main drawback of using propane as a refrigerant is its flammability. To reduce the risk posed by propane, the total mass of propane in the system should be minimized without degrading the system performance. This work deals with how the mass of propane within a capillary tube can be reduced without compromising the system performance. In the first step, the mass flow rate and inlet and outlet conditions of the refrigerant within the capillary tube of a commercial propane air-conditioner under normal working conditions were measured. In the next step, a parametric MATLAB code was developed to determine the required length and volume of the capillary tube, and the velocity and mass of the propane within the capillary tube. The input parameters of the code are the inside diameter, roughness, shape, mass flow rate, and inlet and outlet conditions. The script was run for sixteen common types of capillary tubes, including the one in our laboratory. According to the results, it is possible to considerably reduce the propane mass within the capillary tube using a small inside diameter helical capillary tube with a decreased coil diameter. However, the results should not be extended to an air-conditioner in which the distance between the outlet of the condenser and the inlet of evaporator is fixed and longer than the calculated length.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 by Institute of Mechanics, Vietnam Academy of Science and Technology. Permanent restricted access to published version due to publisher copyright policy.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 27 Oct 2013 22:58
Last Modified: 05 Dec 2017 05:20
Uncontrolled Keywords: charge; mass; capillary tube; propane; air-conditioner; refrigeration
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: D Environment > 96 Environment > 9699 Other Environment > 969999 Environment not elsewhere classified
D Environment > 96 Environment > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified

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