In order to predict the dynamic performance of spiral wound heat exchanger applied in LNG Floating Production Storage and Offloading(LNG-FPSO)

a multi-zone dynamic model of multi-stream LNG spiral wound heat exchanger was developed.A mathematic method by establishing 3(n+1)×3(n+1)diagonal matrices and interconnection matrices was proposed to express parameters in heat transfer calculation of multi-stream heat exchanger

which is capable of describing the heat transfer relationship between each stream and each zone.A heat transfer calculation model for fluid and tube wall based on multi-zone method was presented

considering the staggered arrangement of phase interface

which is capable of calculating heat transfer in the case of phase changes in both cold and hot streams.Case study showed that the presented model could be applied for dynamic simulation of multi-stream spiral wound heat exchanger

and was feasible to handle the transposition of phase interface.The results of presented model agreed well with the existed model

and the validation deviation was less than 4%.