ВПЛИВ НАНОЧАСТИНОК НА ЯКІСТЬ РОБОТИ ТЕПЛООБМІННИХ АПАРАТІВ МАЛОЇ ХОЛОДИЛЬНОЇ МАШИНИ

Abstract

In recent years, a new direction of energy saving in small refrigeration machines has been widely studied in the world, namely the use of new classes of substances as a working fluid. Studies of the thermophysical properties of colloidal solutions of nanoparticles with oils and refrigerants show the high prospects for the use of this class of substances in refrigeration. Therefore, the task of studying heat exchangers operating as part of small refrigeration machines on nanofluids seems relevant. The article provides information on the prospects for the use of nanoparticles in heat exchangers of a re-frigeration machine running on isobutane. The influence of nano impurities is considered in the ex-ample of theoretical and experimental study of the capacitor. At the same time, modern studies of the influence of nanofluids on the heat exchange characteristics of heat exchangers of refrigeration ma-chines were taken into account. Experimental study of a small refrigeration machine running on iso-butane with nanoparticle impurities was performed on a calorimetric stand, which allows the machine to operate in a wide range of modes with support for specified cycle parameters and high-precision determination of the key performance of all elements of the refrigerator, including compressors and heat exchangers. The study showed the high prospects for the use in small refrigeration machines of condensers such as "pipe in a pipe" and the possibility of significantly improving their heat transfer characteristics through the use of nanofluids as a refrigerant. The results show an increase in the heat transfer coefficient in the condenser by 4.5-16 %.