In-situ tests and numerical manipulations were conducted for comparison of superior/inferior quality of casing-tube-vacuumized insulation and polyurethane insulation of fi＇eezing apparatuses in relation to non-unifor...In-situ tests and numerical manipulations were conducted for comparison of superior/inferior quality of casing-tube-vacuumized insulation and polyurethane insulation of fi＇eezing apparatuses in relation to non-uniform cold distribution in the multi-coil fi＇eez- ing layout and the contradiction between large-coil diameter layout of the freezing holes and stability of the headfi＇ame base. Tests show that： （1） under current technology, vacuumized insulation is of short duration due to lack of appropriate applied vacuum; （2） after the freezing pipe is insulated with polyurethane, the temperature gradient is less than no insulation, and the temperature dif- ference between insulated and non-insulated apparatuses is stable as the freezing period increases. Finally, it is pointed out that polyurethane insulation is quite efficient in present technical freezing construction. Keywords： freezing pipe; insulation effect; polyurethane; energy conservation展开更多
基金supported by National S&T Support Program (2006BAB16B01)
文摘In-situ tests and numerical manipulations were conducted for comparison of superior/inferior quality of casing-tube-vacuumized insulation and polyurethane insulation of fi＇eezing apparatuses in relation to non-uniform cold distribution in the multi-coil fi＇eez- ing layout and the contradiction between large-coil diameter layout of the freezing holes and stability of the headfi＇ame base. Tests show that： （1） under current technology, vacuumized insulation is of short duration due to lack of appropriate applied vacuum; （2） after the freezing pipe is insulated with polyurethane, the temperature gradient is less than no insulation, and the temperature dif- ference between insulated and non-insulated apparatuses is stable as the freezing period increases. Finally, it is pointed out that polyurethane insulation is quite efficient in present technical freezing construction. Keywords： freezing pipe; insulation effect; polyurethane; energy conservation
