I Putu Aris Eka Saputra, Sucipta, M., & Hendra Wijaksana. (2023). Performance Evaluation of a Heat Recovery System Combined with a Helical-Type Heat Exchanger as a Water Heater. Natural Sciences Engineering and Technology Journal, 3(1), 190-194. https://doi.org/10.37275/nasetjournal.v3i2.35