P 779 – Sandwich panel construction with energy accumulation, energy distribution and thermal insulation
Industrial standard sandwich panels with metal facings and rigid PU foam core are modified by adhesive bonding additional single-shell trapezoidal wall profiles to the outside. Air may float between the sandwich panel and the trapezoidal wall profile, giving a solar collector which uses the sun to generate heated air on all wall and roof areas. The construction principle demonstrated is named Sandwich Panel with Energy Accumulation and thermal insulation. It is abbreviated as “SEA“.
Aim of the research project was to assess the energy gains which can be retrieved in practical situation by measurements over a whole year. For this aim, a test rig was set up with SEA collectors of lengths between 2.0 and 4.7 m on the south facade and on the roof. Within the test rig, each SEA collector had a manifold and a downstream ventilator which could provide an air flow between 10 and 170 m³/h. The test rig was placed on an open-air test area and subjected to unshaded sun radiation and natural weather. The measurements covered a whole year.
The measurements allowed deriving the basic relations between the operational parameters of the SEA elements. The energy gains proofed to be bigger than estimated before. The SEA collectors delivered energy gains of approx. 160 kWh/(m²·a). From the measurements, the degree of efficiency of the SEA collector was established in order to provide means to pre-calculate the expectable energy gain for any site and orientation.
For a typical industry factory hall direct use of the heated collector air as fresh air supply reduces the energy heat loss by 15%; additionally or as an alternative the heated air may also be used indirectly. The already good energy gain of the developed SEA collector may be increased substantially by increasing the air velocity in the collector.
The SEA collector features a simple, cost-effective construction with standard trapezoidal profiles. It is well suited for the big wall and roof surfaces in industrial factory halls made from PU sandwich elements. The work provides a base for on-going considerations into a new light-weight steel construction principle for sandwich element construction. It also helps to increase energy efficiency of industrial buildings in various climatic regions.
The research project was carried out at Forschungsinstitut für Wärmeschutz e.V., München and of Engineering R. Koschade, Deggendorf. FOSTA has accompanied the research work and has organized the project funding from the Foundation for Steel Application Research.
Only available in german language.
J. Cammerer, M.H. Spitzner, S. Wagener, W. Brunner, R. Koschade, D. Greiner, M. Koschade