Journal
POLYMER
Volume 251, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.124926
Keywords
XPS; Creep behavior; Stepped isothermal method; Findley fit; High temperature; Thermal storage
Categories
Funding
- [27954.1]
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This study investigated the creep effects of XPS insulation material under high temperatures and pressure, and concluded that the creep strain in XPS remains below 6% after 50 years. Additionally, a material model was developed to predict creep strain under different temperatures and stress.
Seasonal Sensible Thermal Energy Storages based on existing inside structures are cost effective and require insulation materials with high performance. The insulation must endure high temperatures and high pressure for a long period. In this study, the creep effects of the insulation material XPS (extruded polystyrene foam) at high temperatures and pressure are investigated to determine whether XPS is a suitable insulation material to be applied on the inside of STES. Two studies were conducted: an isothermal long-term creep experiment and a SIM (Stepped Isothermal Method) experiment. The results of the first study were fitted using the Findley approach and extrapolated to 50 years. The SIM study is a method to accelerate creep effects using thermal effects and the Boltzmann superposition principle. Creep strain after 50 years is directly calculated by extrapolation. Both studies indicate that creep strain in XPS remains well below 6% with an applied load of 61.1 kPa at 60 degrees C after 50 years. Additionally, a material model that predicts creep strain at different or varying temperatures and stress was developed using the SIM data.
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