UJI EKSPERIMENTAL PENGARUH PENGGUNAAN REFRIGERAN R22, R134a, DAN CAMPURAN PROPAN ISOBUTAN TERHADAP KINERJA MESIN PENGKONDISIAN UDARA AN EXPERIMENTAL STUDY OF THE EFFECT OF THE APLICATION OF THE REFRIGERANT R22 AND R134a AND A MIXTURE OF PROPANE ISOBUTANE ON THE PERFORMANCE THE AIR CONDITIONER - Ariyanto, Ariyanto (2013)