| タイトル | Thermal Performance of Cryogenic Piping Multilayer Insulation in Actual Field Installations |
| 本文（外部サイト） | http://hdl.handle.net/2060/20020039045 |
| 著者（英） | Thompson, K.; Augustnynowicz, S.; Fesmire, J. |
| 著者所属（英） | NASA Kennedy Space Center |
| 発行日 | 2002-01-01 |
| 言語 | eng |
| 内容記述 | A standardized way of comparing the thermal performance of different pipelines in different sizes is needed. Vendor data for vacuum-insulated piping are typically given in heat leak rate per unit length (W/m) for a specific diameter pipeline. An overall k-value for actual field installations (k(sub oafi)) is therefore proposed as a more generalized measure for thermal performance comparison and design calculation. The k(sub oafi) provides a direct correspondence to the k-values reported for insulation materials and illustrates the large difference between ideal multilayer insulation (MLI) and actual MLI performance. In this experimental research study, a section of insulated piping was tested under cryogenic vacuum conditions, including simulated spacers and bending. Several different insulation systems were tested using a 1-meter-long cylindrical cryostat test apparatus. The simulated spacers tests showed significant degradation in the thermal performance of a given insulation system. An 18-meter-long pipeline test apparatus is now in operation at the Cryogenics Test Laboratory, NASA Kennedy Space Center, for conducting liquid nitrogen thermal performance tests. |
| NASA分類 | Mechanical Engineering |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/225263 |
