3.3.2. Change in Density with Constant Fan Size and Speed

The volume flow is not affected by a change in density:

 q_V=const.

The pressure and power requirement at the shaft change proportionally to the density (cf. Figure 3.3.2.):

 \frac{p_I}{p^{II}}=\frac{\rho_1}{\rho_{II}}=\frac{T_I}{T^{II}}=\frac{\Theta^I}{\Theta^{II}}

 \frac{P_I}{P^{II}}=\frac{\rho_1}{\rho_{II}}=\frac{T_I}{T^{II}}=\frac{\Theta^I}{\Theta^{II}}

Figure 3.3.2: Change of pressure and shaft power