The Efficiency of Nanofluid Use in the Heat Supply System of a House with a Geothermal Heat Pump

Abstract

Nanofluids, it is the new of generation of the fluids, as it ensures the reliability, efficiency, economy of the modern system of heat supply. Nanofluid-heat carriers are environmentally friendly. Using such heat carriers it is possible to save energy resources, that is, to consume less electricity and fossil energy sources. Nanofluid with volume concentrations of Al2O3 nanoparticles of 0.3S%, 0. S1 % and 1.30% was used as a heat carrier of the geothermal probe of the heat supply system. The convective heat exchange and the friction coefficient of such nanofluid in a round polyethylene pipe $\emptyset 40\times 2.4$ mm of the geothermal probe with a constant wall temperature under conditions of turbulent flow have been studied. In the work there is comparing the transport and thermal characteristics of nanofluids based on Al2O3 and water. The coefficient of the efficiency using of the studied nanofluids with Al2O3 nanoparticles was greater than one, and had a maximum value of 1.197. This is due to the fact that nanofluids have better thermal characteristics compared to water, which leads to improving the heat transfer in general. However, it should be noted that nanofluids have higher values of the viscosity coefficient, which degrades the hydrodynamic performance of the system.