2026-01-292026-01-29202110.2478/rtuect-2021-00722-s2.0-85120356746https://www.scopus.com/inward/record.uri?eid=2-s2.https://ucocris.uco.es/handle/123456789/34296Environmental Science (all)Renewable Energy, Sustainability and the EnvironmentOptimization of the Geometric Parameters of the Thermal Insulation of the Heating System by Using Multi-Pipe Circular Thermal Insulationresearch article