Making a loop in comsol

Hi,

I wanted to make a loop in COMSOL for the inlet temperature but this temperature would be different in each time step. Step 1: T_in(0s)=10C Step 2: T_in(1s)=T_out(0s)+T_load(1) Step 3: T_in(2s)=T_out(2s)+T_load(2) and so on. The simulation is just a Uloop pipe and and there is an inlet and outlet. The outlet is defined as heat outflow. As I know the outlet temperature is defined as "root.comp1.out1" in comsol.

Thanks.