IMPROVING ENERGY EFFICIENCY IN LOCAL WATER SUPPLY SYSTEMS USING PNEUMATIC TANKS AND PUMPS WITH VARIABLE FREQUENCY DRIVE. Proceedings of the YSU C: Geological and Geographical Sciences, Yerevan, Armenia, v. 59, n. 2 (266), p. 319–328, 2025. DOI: 10.46991/PYSUC.2025.59.2.319. Disponível em: https://journals.ysu.am/proceedings-geol-geogr/article/view/vol59_no2_2025_pp319-328.pdf. Acesso em: 10 mar. 2026.