Bawaka na fadada wani bangare ne mai mahimmanci na tsarin firiji, galibi ana shigar tsakanin silin ajiya mai ruwa da mai ruwa. Bawul din fadadawa yana sa ruwa mai sanyi a matsakaici zazzabi da kuma matsin lamba zama rigar turawa da ƙarancin filasta, sannan kuma a ɗora zafin rana a cikin masu shayarwa. Balbawa na fadada bawul ɗin yana gudana cikin canjin superheat a ƙarshen mai tauri mai shayarwa da kuma abin mamaki na ƙwanƙwasa silinda
A saukake, bawul din fadadawa yana hada jiki, kunshin zazzabi da kuma bututun ma'auni
Matsakaicin Matsayi na Balunawar Expansion ya kamata ya canza buɗewa a ainihin lokacin da sarrafa darajar kwararar tare da canjin mai shayarwa. Amma a zahiri, saboda hysteresis na canja wurin zafi a cikin yawan zafin jiki na lura da ambulaf, amsawar bawul ɗin da aka gabatar koyaushe rabin jinkirin. Idan muka zana zane-zane na bawul na bawul, zamu ga cewa ba wani tsari ne mai santsi ba, amma layin wavy. Ingancin bawul ɗin wanda aka bayyana a cikin amplitude na raƙuman ruwa. Mafi girman amplitude, sannu da hankali dauki na bawul da muni da ingancin
