What is THERMOFLEX

Thermoflow, Inc.

WHAT IS THERMOFLEX?

THERMOFLEX is a fully-flexible program for heat balance modeling & engineering. Models are built graphically assembling components “lego-style”. THERMOFLEX is used to model Combined Cycles, Conventional Steam Plants, Process Plants, and more. Performs both design and off-design calculations. Contains powerful “Logical Components” to model off-design controls In combination with PEACE (Plant Engineering and Construction Estimator), itprovides engineering details and cost estimation. THERMOFLEX works alone, or in concert with GT PRO, GT MASTER, and/or STEAM MASTER.

THERMOFLEX

OverviewTHERMOFLEX begins in “Stage1: Draw System”. You have a blank sheet on which you draw your model by connecting icons from the icon bar at the bottom.

Alternatively, you can start by loading an existing file, or importing an existing GT PRO file.

THERMOFLEX has a clearly organized structure. At any time you work in one of four stages shown here.

You can easily move from stage to stage, and back again as needed to refine and redefine your model.

THERMOFLEX

Basic FunctionalityDrawing screen – drag components from the component bar at the bottom to construct your model.

A context sensitive help system gives you access to the entire THERMOFLEX manual

Green tab holdsPEACE components which use physical equipment models. These models generate spec sheets and cost estimates on output.

Pointing at an iconproduces an enlargedimage with its connectionpoints and its full name.

Individual component icons

Each tab summons a different component bar with its own set of components. In total approximately 130 components are available.

THERMOFLEX

Draw SystemThe model has two screens: One for steam turbine and one for boiler. You may place components on up to 10 separate screens for ease of navigation or better clarity.

Each node on the components has beenconnected to another component eitherdirectly or through a connector (black line).

Here, we are in the middle of creating a coal fired conventional steam cycle using mainly PEACE components.

THERMOFLEX

Check Drawing

LP FWH train

Condensing reheat steam turbine (screen 1 of 2)

Water Cooled Condensers connected to Wet Cooling Tower.

LP turbine

HP FWH train

Once the plant drawing is completed, press this ‘Check Drawing’ button to transition from ‘Stage 1: Draw System’ to ‘Stage 2: Edit Inputs’.

IPTHPT

THERMOFLEX

Design – Edit Inputs

Double-click anyicon to summon its input screen.

Each component has its own input screen like this one shown for the rotary air heater. You can review defaults, and edit inputs to suit your needs.

All numerical inputs for each component and overall plant are initialized with defaults. The model may be computed at any time from this stage.

Now we are in Stage 2: Edit Inputs. The screen background is solid gray to distinguish it from the previous stage, ‘Stage 1: Draw System’.

THERMOFLEX

Design – Edit ST Assembly Input

Once the components are “in” the assembly, other detailed input screens are available to specify leakages, last stage bucket data, and other details.

THERMOFLEX has “Assembly” models that provide additional features for a collection of components. While a steam turbine section itself does not have a cost output, a steam turbine assembly consisting of one or more sections does.

The steam turbine type and configuration was defined. In this case a four casing reheat configuration is chosen. The assembly manager then automatically establishes defaults for leakages that you can accept or edit below.

THERMOFLEX

Design – Check Inputs and Activate Calculation

By the way, THERMOFLEX has a large library containing sample files describing different types of plants and models.This example is one of the sample files.

After editing inputs the model the user can performCheck Inputs and activate the Calculation.

Computation progress isdisplayed in a separate window.

THERMOFLEX

Design – Computation Complete & WarningsComputation has completed and

messages can be displayed.

Advisory and Warning messages

THERMOFLEX

Design – General OutputGeneral output screen

One way of displayingthe outputs is throughstream tags.

THERMOFLEX

Design – Component Output Heat Balance

PEACE componentsalso have atabulatedoutput form.

Final heat balance data are displayed on this graphic.

Each componenthas a similaroutput graphicwhich can bedisplayed in allprogram modes.

TQ-diagram

THERMOFLEX

Design – Component Output Hardware

Second HP superheater hardware designedby the program in Designmode.

One of four tabs with tables describing details of theevaporator and one drawing showing the tube bundle.

These tabulated outputs are available for PEACE components only.

THERMOFLEX

Design – ST Assembly Output

Steam turbine thermodynamic data and hardware are described in sub-tabs applying data from each component in the assembly.

HPT IPT LPTs Generator

General cycle performance data

can be displayed.

Steam turbine main dimensions.

THERMOFLEX

PEACE Output – Example of cost

Steam Turbine cost fromSpecification tab.

Steam Turbine main dimensions from Specification tab.

Steam Turbine elevation view.

Size & Cost of the steam turbine.

THERMOFLEX

Off-Design – Edit Boiler Load Plant load can be adjusted by

setting the appropriate boiler load.

In Off-design the user can adjust hardware for all PEACE components to match an existing plant or

vendor data.

In Off-design the user canperform simulations withthe design.

THERMOFLEX

Off-Design – Edit Steam turbine control

To perform batches of runs toexplore plant performanceMultiple Runs are available.

ST inlet pressure control.

THERMOFLEX

Off-Design - OutputIn general Off-design outputs are similar to Design outputs.

The stream table canbe exported to Excelto work on additionalgraphic displays orcalculations.

The stream table can be displayed both

in Design and Off-design mode.

THERMOFLEX

Program Options

Also the steam property formulation may be selected. Available formulations: Thermoflow Proprietary (STQUIK) IFC-67 (previous ASME standard from 1967) IAPWS-IF97 (current ASME standard from 1997)

Common unit systems fromaround the world are supportedby THERMOFLEX.

THERMOFLEX

Multiple Runs – Edit Input

Part load calculations with constant ambient conditions.

Thermoflow Macro enables the user to performseries of calculations in an easy and fast way.

Inputs to vary in themacro may be selectedfrom an extensive listof inputs availablefrom THERMOFLEX.

Full load calculations with varyingsite ambient temperature.

THERMOFLEX

Multiple Runs - OutputPlant Summary and the two subsequent tabs display fixed lists of output data.

Any of the general tabs allows theuser to define which data (outputsas well as inputs) to display in thatspecific table.All tables can be exported to Exceldirectly or saved as a .CSV file forlater load into Excel.

Plots can be created.As an example Net efficiency vs. Boiler load.

For each case THERMOFLEXoutput can be displayed.

THERMOFLEX

More Information

Please contact Thermoflow for further information and a Demonstration CD.THERMOFLOW, INC.29 Hudson Road, SudburyMassachusetts 01776USATel: +1-978-579-7999Fax: +1-978-579-5995E-mail: info@thermoflow.com