0 – 5 0 ▁N m 3 / h ▁ 4 0   MP a ▁for ▁disp ens ation ▁of ▁hydro gen . ▁Since ▁compression ▁generates ▁heat , ▁the ▁com pressed ▁gas ▁is ▁to ▁be ▁co o led ▁between ▁stages ▁making ▁the ▁compression ▁less ▁ad i ab atic ▁and ▁more ▁is oth erm al . ▁ ▁The ▁default ▁assumption ▁on ▁dia ph rag m ▁hydro gen ▁compress ors ▁is ▁an ▁ad i ab atic ▁efficiency ▁of ▁ 7 0 %. ▁U sed ▁in ▁hydro gen ▁stations . ▁ ▁Gu ided ▁rot or ▁compress or ▁ ▁The ▁gu ided ▁rot or ▁compress or ▁( G RC ) ▁is ▁a ▁positive - dis p lacement ▁rot ary ▁compress or ▁based ▁upon ▁an ▁en vol uted ▁tro cho id ▁geometry ▁which ▁util izes ▁a ▁parallel ▁tro cho id ▁curve ▁to ▁define ▁its ▁basic ▁compression ▁volume . ▁It ▁has ▁a ▁typical ▁ 8 0 ▁to ▁ 8 5 % ▁ad i ab atic ▁efficiency . ▁ ▁Linear ▁compress or ▁ ▁The ▁single - p ist on ▁linear ▁compress or ▁uses ▁dynamic ▁counter bal ancing , ▁where ▁an ▁auxili ary ▁mov able ▁mass ▁is ▁flex ibly ▁attached ▁to ▁a ▁mov able ▁p ist on ▁assembly ▁and ▁to ▁the ▁station ary ▁compress or ▁cas ing ▁using ▁auxili ary ▁mechanical ▁spr ings ▁with ▁zero ▁v ibration ▁export ▁at ▁minimum ▁elect rical ▁power ▁and ▁current ▁consum ed ▁by ▁the ▁motor . ▁It ▁is ▁used ▁in ▁cry ogen ics ▁ ▁See ▁also ▁Com pressed ▁hydro gen ▁H ydro gen ▁tur bo exp