Category: EuroSun2008-3

Model development

1.1. General specifications The PVT system modelled uses air as the heat transfer fluid, drawn through a duct at the rear of the PV modules, and has a glass cover. In winter, air is drawn past the rear of the photovoltaic panels and ventilated into the house. In summer, it is envisaged that air would […]

Photovoltaic efficiency

Using TRNSYS the PVT system was modelled with a flow rate of 300 kg/hr (0.083 kg/s), equivalent to one building air change per hour, and with zero air flow, as would be the situation for a non-ventilated building integrated PV system. The results showed a difference of at most 1.3% between the PV efficiency operated […]

Research approach

1.1. Goals The just described experience demonstrates that a deep attention has to be paid in planning SHC-CHP systems from three points of view: layout, control strategy and machine sizes. The present research work proposes a first layout with a specific control strategy and a procedure for sizing such a plant with the main goal […]

Definition of the feed in scenarios

Because electricity can be fed into the distribution grid, grid restrictions are with a moderate penetration of RES actually not the limiting factor. But with a higher amount of decentralised production the transport capacity of the grids will be reached. Variable tariffs give a soft stimulation for operators to shift their operation schedule. In [6] […]

Performance of a multifunctional PV/T hybrid solar window

Henrik Davidsson*, Bengt Perers, Bjorn Karlsson Energy and BuildingDesign, Lund University, B. O Box 118, SE 221 00 Lund, SwedenCorresponding Author, henrik. davidsson@ebd. lth. seAbstract A building-integrated multifunctional PV/T collector have been developed and evaluated. The PV/T solar window is constructed of PV cells laminated on solar absorbers and is placed in a window behind […]

Measurement results and system design

3.1. Electrical performance During this study it was not possible to measure the cells temperature directly since the trough structure is closed. Hence, the average water temperature running inside the thermal absorber at the moment of the electrical efficiency measurement is presented instead. Using the maximum electric power extracted by Solar8 together with the incident […]

Simulation programs

Building energy modelling was conducted using TRNSYS and the equation based IDA Indoor Climate and Energy (ICE) building energy simulation programs. TRNSYS was used as a PVT component Type 567 was available as part of the Green Building Component Library and this component interfaces with the Type 56 Multi-zone building. The key parameters and inputs […]

Thermal efficiency

The average thermal efficiency as modelled in TRNSYS was 22%. This value for thermal efficiency agrees with values for thermal efficiency as illustrated in graphical results of Tonui and Tripanagnostopoulos [10] for a PVT system with a channel depth of 0.15m. The convective top heat loss coefficient of the PVT system varies with wind speed […]