Empirical validation

In order to improve the PV model, a comparison has been made between measurements and simulation data (see fig. 11) for the case of the PV panel with a confined air layer. In previous articles, the ISOLAB code has already been validated in many cases by comparisons with other building simulation codes, as well as experimental validations. This comparisons can show advantages and disadvantages of the model. In figures presented below, the main temperatures are compared for the previous cell.

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Fig. 11. Temperatures of the PV installation with a confined air layer.

For the temperatures obtained for the body of the cell, a good agreement is obtained, the average difference of temperature being weak, of the order of 1°C. Nevertheless Figure 11 shows, although the PV model has a good dynamic behaviour in the case of a confined air layer, noticeable differences between the model and the reality of measurements. These differences can be related to:

• Thermo-physical properties (conduction, thermal capacity, transmitivity, absorptivity…) of each PV panel material, which are not exactly known. Industrials did not give details of those properties in order to protect their copyright.

• The precision of the radiative model (of PV panels) or convective model (of air layer) in the PV modelling.

To give elements of answers for these differences between predictions and measurements, a sensitivity analysis was made, as explained in the following paragraph.

Updated: August 22, 2015 — 3:55 am