Cite the paper
Mechanics, Materials Science & Engineering, 16 , 2018, ISSN: 2412-5954.
Authors: Phuduc Nguyen, Kimhang Vo, Thanhtrung Dang
ABSTRACT. This paper presented investigations on the pressure and the power input of a CO2 air conditioning system. In this study, the cycle changes from the vapour region to the two phase region for the conventional compressor and CO2 compressor, respectively. The suction and discharge pressures increase when the ambient temperature increases. When the ambient temperature increases from 31.8 °C to 40.5 °C, the compressor current increases from 2 A to 2.3 A. The suction pressure and the compressor current decrease as reducing the balance pressure of the system. Comparison between the gas cooler with heat transfer area of 6 m2 and the gas cooler with heat transfer area of 3 m2, the gas cooler with high heat transfer area has increased the cooling capacity of the system.
Keywords: air conditioning, CO2 refrigerant, pressure, power input, evaporator, heat transfer
 Baheta, A.T., et al., Performance investigation of transcritical carbon dioxide refrigeration cycle, Procedia CIRP, Vol. 26, 2015, pp. 482 – 485
 Cheng, L. and Thome, J.R., Cooling of microprocessors using flow boiling of CO2 in a micro-evaporator: Preliminary analysis and performance comparison, Applied Thermal Engineering, Vol. 29, 2009, pp. 2426 – 2432
 Zhao, X. and Bansal, P.K., Flow boiling heat transfer characteristics of CO2 at low temperatures, International Journal of Refrigeration, Vol. 30, 2007, pp. 937 – 945
 Manhoe Kim, Jostein Pettersen, Clark W. Bullard, Fundamental process and system design issues in CO2 vapor compression systems. Progress in Energy and Combustion Science, Vol. 30, 2004, pp. 119 – 174
 Thome, J.R. and Ribatski. G, State-of-the-art of two-phase flow and flow boiling heat transfer and pressure drop of CO2 in macro- and micro-channels, International Journal of Refrigeration, Vol. 28, 2005, pp. 1149 – 1168
 Cheng, L., et al., New prediction methods for CO2 evaporation inside tubes: Part I – A two-phase flow pattern map and a flow pattern based phenomenological model for two-phase flow frictional pressure drops, International Journal of Heat and Mass Transfer, Vol. 51, 2008, pp. 111 – 124
 Cheng, L., et al., New flow boiling heat transfer model and flow pattern map for carbon dioxide evaporating inside horizontal tubes, International Journal of Heat and Mass Transfer, Vol. 49, 2006, pp. 4082-4094
 Ducoulombier, M., et al., Carbon dioxide flow boiling in a single microchannel – Part I: Pressure drops”, Experimental Thermal and Fluid Science, Vol. 35, 2011, pp. 581 – 596
 Dang, C., et al., Flow boiling heat transfer of carbon dioxide insidea small-sized microfin tube, International Journal of Refrigeration, Vol. 33, 2010, pp. 655 – 663
 Ge, Y.T., et al., Design Optimisation of CO2 Gas cooler/Condenser in a Refrigeration System, Energy Procedia, Vol. 61, 2014, pp. 2311 – 2314
 Yun, Rin., et al., Numerical analysis on a microchannel evaporator designed for CO2 air-conditioning systems, Applied Thermal Engineering, Vol. 27, 2007, pp. 1320 – 1326
 Dang, T.T. and Teng, J.T., Comparison on the heat transfer and pressure drop of the microchannel and minichannel heat exchangers, Heat and Mass Transfer, Vol. 47, 2011, pp. 1311-1322
 Dang, T.T. and Teng, J.T., The effects of configurations on the performance of microchannel counter-flow heat exchangers – An experimental study, Applied Thermal Engineering, Vol. 31, 2011, pp. 3946-3955
 Dang, T.T., et al., A study on the simulation and experiment of a microchannel counter-flow heat exchanger, Applied Thermal Engineering, Vol. 30, 2010, pp. 2163-2172
 Kim, N.H., et al., Effect of Inlet Configuration on the Refrigerant Distribution in a Parallel Flow Minichannel Heat Exchanger, International Journal of Refrigeration, Vol. 34, 2011, pp. 1209-1221.
Mechanics, Materials Science & Engineering Journal by Magnolithe GmbH is licensed under a Creative Commons Attribution 4.0 International License.
Based on a work at www.mmse.xyz.