▎ 摘　　要

NOVELTY - The invention claims a temperature feeling bag, expansion valve and heat exchange system. temperature sensing packet comprises a shell; the shell comprises metal and graphene, graphite alkene is at least partially exposed on the outer surface of the shell. heat conducting coefficient because the heat conducting coefficient of the graphene is higher than metal, which makes sensing can sensitively and accurately sensing the temperature, good expansion valve accurately and sensitively adjust the opening size, thereby accurately adjusting the temperature in refrigerating or heating the heat exchange system.