Environmental Engineering Reference
Figure 2.34 Comparison of the electrical energy production by the PV system and the energy used for
thermal collector gains and the secondary heat emission increase with higher volume
flows through the fa¸ade. Because of the nearly constant energy production of the PV
elements, the necessary energy for the fan increases with higher air speed rates and
the remaining energy therefore decreases.
Figure 2.35 Relations of secondary heat flow, fa¸ade collector thermal gains and electrical power
supplied by the PV modules differentiated into winter and summer situations