Performance requirements (general)IEA-SHC Task 39 INFO Sheet B1
May 2015 - PDF 0.43MB
A crucial aspect of using polymeric materials in solar thermal systems is the exact knowledge about the occurring loads especially for temperature and pressure changes. The limited thermal property in various polymers in comparison to the present primarily used materials (copper, aluminum or glass) in reference systems makes it inevitable to determine load profiles. In the framework of the national project SolPol investigations were made to create temperature and pressure load matrices for the main components of solar thermal systems. To achieve a broad knowledge-base, different applications (domestic hot water in single and multifamily houses, combi-systems) and systems concepts for the main climate zones of the world have been investigated. Furthermore, modified polymeric solar thermal systems with overheat protection (backcooling, ventilation, thermotropic layer) and without overheat protection (drain-back, thermosiphon) have been examined. Extended simulations form the basis to deliver load profiles for solar thermal systems based on polymeric materials. Building on the results (system efficiency) derived from reference systems, the accompanying INFO Sheets B2: “Thermal stress” and B3: “Pressure stress” give an overview about the performance requirements for the materials which will be investigated.