Welcome to the TRNSYS Users Forum.
The forum is a place where people can interact and have discussions about different topics involving the use of the TRNSYS software package. Here you can post topics for discussion or questions on using TRNSYS and get advice from other users or TRNSYS experts. This forum is not intended for detailed technical support. Users should contact their distributor’s hotline for such assistance.
Some tips for success on using the forum:
- Follow the Forum Rules posted in Forum Administration.
- There are categories for different types of topics and questions. Post your topic or question into the proper category.
- Before posting a topic or question search the existing topics (and the TRNSYS Users listserv archive) to see if a similar topic or question has already been answered.
- Use a descriptive topic name. Don’t use attention getting subjects, they don’t get attention and only annoy people.
- State the version of TRNSYS and which add-ons your are using.
- Include enough specific details for your topic of question to be answered. Just posting “Why am I getting an error?” without describing the specific error and what you are trying to do when you get the error will not receive a response that fixes your issue.
- Remember when people help you, they are doing you a favor. Be patient, help people out by posting good descriptions of what you need help with, and be polite even if a response does not solve your issue.
- Moderators may edit your post for clarity or move your topic to a more appropriate category.
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.
