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For a very simple/basic steam generator model, you could just insert something in an equation block like:
mdot_steam = efficiency*kW_input*3600/h_fg_steam
Where h_fg_steam is the latent heat of vaporization of steam at the desired pressure and efficiency is the efficiency of the steam accumulator. 3600 converts units of kW to units of kJ/hr, and the output mdot_steam will be in kg/hr.
For a more detailed model that calculates effectiveness, etc, you'll want a component that takes flow rate and temperature of the waste heat as inputs. In that case, if you have access to the TESS Loads and Structures libraries, you could use TESS Type 682 or Type 693 to apply the given load to a flow stream. You could then connect the outlet flowrate and temperature from Type 682/693 as inputs to a steam generator model, and connect the output flowrate and temperature of the waste heat stream back to Type 682/693. I would include a 0 kW fan or pump that sets the flow rate in that loop as well, and if the steam generator model doesn't have thermal capacitance or mass, I would include a perfectly insulated duct or pipe with at least a timestep's worth of thermal mass as well, to promote convergence. You can then play around with the flow rate in the loop and see what effect it has (if any) on the steam generation.
