To　simplify　the　dual-loop　heat　pump　ventilation　heat　recovery　system,　a　new　type　of　dual-cylinder　rotary　compressor　with　two　independent　suction　ports　and　two　independent　discharge　ports　was　designed　and　used　to　drive　the　heat　recovery　system　in　this　paper.　Thus,　a　system　cycle　approaching　the　Lorentz　cycle　was　formed　by　dual-loop　compression　cycles.　A　test　bench　of　heat　pump　system　for　ventilation　heat　recovery　with　a　novel　compressor　was　built　to　carry　out　system　performance　experiment.　Experimental　results　showed　that　the　COP　of　the　dual-loop　system　under　winter　test　conditions　could　be　increased　by　17.1%　compared　with　that　of　the　traditional　heat　pump　system　with　a　single　loop.　The　COP　of　the　dualloop　system　could　reach　10.21　under　the　outdoor　temperature　of　-5　degrees　C　and　the　indoor　temperature　of　20　degrees　C.　Under　summer　test　conditions,　the　COP　of　the　dual-loop　system　was　up　to　33.47%　higher　than　that　of　the　traditional　system.　Under　the　outdoor　temperature　of　40　degrees　C　and　the　indoor　temperature　of　27　degrees　C,　the　COP　of　the　dual-loop　independent　compression　system　could　reach　4.69.　The　performance　level　of　the　heat　pump　system　for　ventilation　heat　recovery　could　be　greatly　improved　using　the　novel　compressor　with　independent　suction　and　discharge　ports.　(C)　2019　Elsevier　Ltd　and　IIR.　All　rights　reserved.