Study on influence of wrapping and seaming techniques on thermal performance of multi-layer insulation
Wrapping and seaming techniques act as factors influencing the insulation perform-ance.The cryogenic insulation performance of MLIs under four different material wrapping ar-rangements was investigated using the static liquid nitrogen boil-off calorimetry.This study exam-ined the combined effects of wrapping and seaming techniques on the thermal performance of these MLIs.Results demonstrated that the clamshell-wrapped approach significantly benefited the en-hancement of insulation performance.Compared with other seaming techniques,the layer-by-layer interleaved seams prevented interference among distinct reflectors,facilitating isothermal condi-tions within the same layer and resulting in an exemplary insulation effect.The MLI configuration comprising 20 reflectors,utilizing both a clamshell-wrapped approach and layer-by-layer inter-leaved seams,exhibited superior performance,with a heat flux of 1.840 W/m2 and an apparent thermal conductivity of 6.699 × 10-5 W/(m·K).Conversely,the MLI configuration with 20 re-flectors employing a spiral-wrapped approach coupled with overlapped and fold-over seams showed suboptimal performance,with a heat flux of 3.775 W/m2 and an apparent thermal conductivity of 1.266 × 10-4 W/(m·K).The choice of wrapping and seaming techniques markedly affects the efficacy of MLIs;hence,it should be judiciously and effectively selected and applied in accord-ance with specific requirements.
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