PV-PCM integration in glazed buildings. Numerical study through Matlab/Trnsys linked model

The paper describes the implementation of a 1-dimensional transient model based on the enthalpy method to analyse the thermal behaviour of a Phase Change Material (PCM) layer integrated in a window. The model and algorithm have been validated by comparison with experimental data. The model has then been expanded to couple a PV layer with the PCM layer. The complete model is implemented in MATLAB and linked to TRNSYS in order to estimate the dynamic thermal energy demand of a building equipped with a double skin fa\ue7ade with a PVPCM layer in a ventilated cavity. A parametric study was carried out, investigating three different cavity ventilation strategies for two European cities (Venice and Helsinki). The results show that, when the PCM layer is coupled with the PV layer, in Venice the cooling energy demand is 60 % lower, while in Helsinki the heating demand during the winter season is 36 % lower

A novel implementation of wind energy in buildings based on synthetic jet concept

The flow around the baseline building is compared to the flow pattern obtained by introducing an air duct on the top of it, which is blowing a fixed air mass flow rate (the jet). The energy required to produce this jet is not considered since it is presumed to be already available from other sources (e.g. ventilation system). Different jet mass outflows are varied in order to find the optimal set to obtain a flow reattachment after the separation at the building edge. The simulation is conducted by means of validated Computational Fluid Dynamics (CFD) solvers based on Reynolds Average Navier-Stokes (RANS) equations. Two- and three-dimensional domains are considered and validated against experimental results. The duct is modelled in the three-dimensional CFD simulation and considered as a velocity inlet. The analysis provided the velocity profiles on different positions on the roof: a reduction in the flow separation would enable an installation of a wind turbine with a lower support and the interception of a uniform accelerated wind speed provided by the hill effect

Computational analysis of the influence of PCMs on building performance in summer

The insulation of buildings in summer requires to exploit the heat capacity of materials in order to delay the heat transfer through the building structure. Phase change materials (PCM) installed in buildings can reduce the indoor temperature; however, given their high cost, their use must be evaluated carefully. This paper investigates the structures that can be coupled with PCM efficaciously, and it highlights some problems that could be caused by PCMs. The investigation has been performed numerically by means of the Energy-Plus software