Authors : N. Chekir and A. Bellagi
Abstract: We propose in this study, the use of the butane/octane mixture as working fluids for the absorption chiller and the comparison of its performance with the classical ammonia/water mixture. The efficiencies of the considered mixtures are estimated in the same operating conditions of a simple effect machine. When the condenser and the absorber of the machine are cooled with the ambient air the COP of the first system is 0.37, while the performance of the ammonia solution is about 0.52. For a machine cooled with the water the two mixtures lead to comparable coefficients of performance: 0.62 for the butane/octane and 0.67 for the ammonia/water mixture. This harmless natural combination is an interesting alternative since the machine working with this mixture can use a heat driven source at moderate temperature such as a thermal waste or vacuum solar panel. The two working pressures are also moderate (<5 bar) reducing the necessity of high airtightness in the construction of the machine.
N. Chekir and A. Bellagi, 2010. Comparison of a Butane/Octane Absorption Machine with an Ammonia/Water One. Journal of Engineering and Applied Sciences, 5: 45-49.