1. WHAT IS STEAM PRO? Thermoflow, Inc.
STEAM PRO is a highly automated system design tool – a heat balance
program specifically intended for design of steam power cycles.
Use STEAM PRO to build models for conventional steam cycles, including their
boilers, and also for steam cycles of nuclear power plants.
In combination with PEACE (Plant Engineering and Cost Estimator), STEAM PRO
provides engineering details and cost estimation.
STEAM PRO performs design-point calculations only – use STEAM MASTER for
simulations of part loads or other off-design conditions.

2. What does PEACE add to STEAM PRO?
What is PEACE?
PEACE is Thermoflow’s Plant Engineering And Cost Estimator, an
additional tool that works in conjunction with Thermoflow’s heat balance
design and simulation programs.
What does PEACE add to STEAM PRO?
PEACE brings regional costs, engineering details, and concerns beyond
the heat balance performance into a comprehensive description of the plant.
PEACE provides graphic and tabular information about size, weight,
and cost of plant equipment.
PEACE produces a detailed total plant cost estimate.
PEACE provides a simple pro forma financial projection to estimate
cash flows, return on investment, and break-even power cost.
PEACE can be used to impose more detailed hardware effects upon
heat balance simulations, particularly piping and pump hardware details.

3. Inputs – General Arrangement
The Navigator column displays the major input
topics. Topics in STEAM PRO are arranged
vertically, and follow a hierarchy, progressing
from top to bottom. Selections made in an
upper (earlier) topic will condition the selections
available in lower (later) topics.
Tabs are used as necessary to subdivide
topics; green tabs include PEACE inputs
Every entry box has been initialized with a
reasonable value. You never have to fill an
empty box. Instead you edit just those that
are of concern to you, trusting the others to
have been logically selected.
The Guidance window includes a description of the
presently selected input

4. The program opens to the New Session topic
Select to begin a new design or to revise an existing one.
Select the steam supply type for the plant you will design.
Select a representative range of output. You will specify
the actual output later, but the Setup Wizard uses this
range to initialize the design’s:
>main steam conditions (P&T),
>configuration and reheat (or not),
>number of feedwater heaters, and much more.
Click on Start Design to continue.

5. At the Start Design topic...
Select (or accept) the
steam turbine type.
Click any other topic to move on.
Edit entries in any order you
choose, then click Compute.
The internal hierarchy for order of
the inputs (top to bottom) will
intervene only as necessary for
consistency.

6. At the Plant Criteria topic...
Of the several Tabs within this topic, the Site and Cooling
tab is of greatest importance to the thermal design.
The program’s default fuel is characterized in the Fuel
Selection panel. Click on the Fuel Library & User-
defined Fuel button to select a different fuel ...

7. Within the fuel selection utility ...
Click on any of the several fuels listed within the Fuel
Library to replace the default fuel, or select User-defined to
specify the properties of the fuel anticipated at your site.
Click on OK to return to the Plant Criteria topic.

8. Also at Plant Criteria ...
Select the cooling system type of your choice.
The figure illustrates and confirms your selection.

9. Visiting the Regional Costs tab...
Click on any of the domestic (US) or international locations
to view and then initialize values for Cost Multipliers, which
condition the STEAM PRO / PEACE cost estimation relative
to the reference, generic US cost estimate.

10. Within the Cooling System topic ...
Click on the Design Method selector if you wish to exert more
control upon the cooling system’s design parameters. By
default, parameters will be set automatically, in accord with the
ambient conditions and your Cost/Efficiency setting.

11. Within the ST Inputs topic ...
You can:
Specify design target – Gross power, Net power, or Steam flow.
Edit main steam P & T, and crossover pressure, as desired.
Configure numbers of steam turbine casings.

12. Moving on to feed water heaters ...
Using reasonable defaults and conditioned by inputs made
before reaching this display, the entire feedwater heater
system has been initialized, extracting steam from the
turbine at conditions suitable for the expected overall water
temperature rise.
The user, of course, can edit these settings, as well as
reselecting the steam sources for the heaters.

13. Looking at the Boiler Thermal topic...
There are also several layers of inputs for the boiler. In
Automatic design mode, only the Main tab is accessible.

14. STEAM PRO Outputs Three categories of outputs – Text, Graphics, and
PEACE, are provided, each with multiple tabs
to help you quickly find the results you need.
The two last buttons let you:
Produce a series of related designs begun with the current file
Begin simulation of the present design, under different
conditions, using STEAM MASTER.

15. STEAM PRO Text Output Select from the Tabs above to
view the category of text output
of interest.

16. STEAM PRO Graphics Output
This overview displays gross and net electrical output, heat
rate, and fuel energy input. Note also the many other
graphic displays to be selected from the tabs above.

17. Graphics – Steam Turbine Display
This figure illustrates all the significant flows to and from
the steam turbine, including extractions for the feedwater
heaters. Units are identified in the lower right corner.

18. Graphics – Turbine Expansion Line
The useful Mollier diagram illustrates the steam conditions
through the turbine and the effect of the exhaust loss.
Clicking anywhere on the diagram causes the data to be
displayed in tabular form.

19. Graphics – Psychrometric Chart
Shown here for a combination wet-dry cooling tower, this
diagram shows the conditions of the humid air passing
through and mixing after the wet and dry segments of
cooling tower.

20. PEACE Outputs PEACE provides Schematics like this Site Plan,
Equipment Data tables, a Cost Report detailing the
capital investment, and a pro forma Cash Flow analysis,
in addition to the STEAM PRO heat balance outputs.

21. PEACE Schematics Select from the list to see dimensioned layouts of
the site and of plant equipment.

22. PEACE Equipment Data
For each of the equipment categories, selectable by the
tabs visible here, these tables indicate size, weight, and nameplate specifications.

23. PEACE Cost Report
Project Summary is shown, but click on any tab to see the
individual breakdown of costs. Note the two columns:
Reference Cost and Estimated Cost.
Click on Cash Flow to see a pro forma financial projection.

24. PEACE Cash Flow
This Financial Summary table displays the overall results of
the pro forma Cash Flow projection detailed in the subsequent tab.
In very little time, you can use these results to explore the influence
of design decisions on plant economic performance.