Physical Principles of Wastewater Heat Utilization Using High-Temperature Solar Installations

Abstract

In world practice, the use of renewable energy sources and heat pump devices in creating modern energy and resource-saving systems for managing traditional fuel and energy resources is increasing. Experimental research, technical measurements, and heat and technical calculation methods were used to assess the efficiency of obtaining technical clean water by utilizing the low-potential heat of wastewater at the “Shurtan Gas-Chemical Complex” enterprice. Analysis of wastewater’s physical and thermal properties from “Shurtan Gas-Chemical Complex” enterprice. Empirical equations were obtained that determine the physical properties of wastewater formed from the addition of oily, chemically contaminated, and domestic wastewater generated in the technological processes of “Shurtan Gas-Chemical Complex” enterprice. As a result, it was determined that the density of wastewater is ρ = 920.2 kg/m3, and the coefficient of dynamic viscosity is μ = 0.00496 m2/ s. A technological scheme was developed that allows obtaining technical water by utilizing the heat of wastewater from “Shurtan Gas-Chemical Complex” enterprice using parabolic cylindrical solar concentrator, and equations were obtained that allow calculating its energy efficiency. For the technological process, 6 Eurotrough-150 solar concentrators are connected in series, with a reflector surface area of 408.75 m2 and a length of 74.25 m. According to the technical parameters of the Eurotrough-150 solar concentrator, experimental studies and calculation results, it was determined that the Eurotrough-150 solar concentrator in the natural climatic conditions of the city of Karshi has an average solar radiation of 700–800 W/m2, ηPCSC = 19.54%, when the Re number of wastewater is 10,000, ηPCSC = 39.08% when Re = 20,000 and ηPCSC = 97% when Re = 50,000