| 摘要 |
The application discloses an insulated pipework system comprising an outer sleeve, an inner flow pipe and an insulating layer within the space therebetween, characterised in that the insulating layer comprises at least one discrete block of a first insulating material substantially surrounded by a second insulating material in particulate form. This enables the discrete blocks of the first insulating material to provide the majority or all of the necessary insulation, whilst the particulate second insulating material can be packed around the first material in order to provide the necessary shear force transfer. It is preferred if the first insulating material has a lower thermal conductivity than the second, more preferably a thermal conductivity of less than half that of the second. It is still more preferred if the thermal conductivity of the first material is less than 35% of the second, yet still more preferably less than 25%. It is also preferred if the first insulating material is silica block. A suitable thickness for the first insulating material is between 10 and 5 mm, more preferably between 15 and 25 mm. The average particle diameter of the second insulating material is preferably less than 150 th of the average block size of the first material. More preferably, the particle diameter is less than 400 th of the average block size. |
