Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11011420 | Solar Energy | 2018 | 6 Pages |
Abstract
This paper deals with the global aging behaviour of a polypropylene random copolymer liner material for seasonal thermal energy storages. Hot air aging experiments at elevated temperatures of 95â¯Â°C, 115â¯Â°C and 135â¯Â°C were carried out using micro-sized specimens with thicknesses ranging from 50 to 2000â¯Âµm. The aging indicator strain-at-break was monitored for an exposure of up to 1500â¯days. Potential and Arrhenius equations were used to fit the experimental hot air aging data referring to thickness and temperature dependency. A semi-empirical model was established and used to assess the lifetimes of polypropylene based thermal energy storage liners. The high quality of the thickness/temperature-model was approved by low divergence of the lifetime values between experimental and modelled failure data. Depending on the temperature loading profile of the seasonal thermal energy storage lifetime values ranging from 20 to 47â¯years were deduced for a PP liner with a thickness of 2â¯mm.
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Michael Grabmann, Gernot Wallner, Klemens Grabmayer, Wolfgang Buchberger, David Nitsche,