Flowlinesarenormallyburiedintosoilbothtoimprovetheinsulationpropertiesandtoprovidemechanicalprotection.Thisgivesextracontributiontotheinsulationsothatthetotalheattransfercoefficientcanbeexpressedas:wherezistheburialdepthtothepipecentre. (共 236 字) [阅读本文] >>