Steam Coil Air Heater (SCAH) Modelling as Porous Medium to Analyze Flow Characteristic and Reduce Self Energy Usage in Gresik Unit 1 Steam Power Plant - Ariyanto, Eko; PT Pembangkitan Jawa Bali, Surabaya, Indonesia (IPTEK, LPPM, Institut Teknologi Sepuluh Nopember, 2019)