The renewability indicator and cumulative degree of perfection for gamboeng tea; part.1, exergy calculation of fresh tea leafTeuku Beuna Bardant, Muthia Syafika Haq, Arief Ameir Rahman Setiawan, Sugeng Harianto, Joko Waluyo, Adhi Irianto Mastur, Annisa Dieni Lestari, Sujarwo, Anny Sulaswatty and Edi Iswanto WilosoE3S Web Conf., 74 (2018) 07003DOI: https://doi.org/10.1051/e3sconf/20187407003