Tool box components provided in the module and run the calculations, view and evaluate results, save or print them. This is a useful tool especially when user needs to evaluate a design or Performa “This software is designed to simulate a steam system model. User can construct process flow diagram using engineering what if Scenarios” in design or to evaluate the energy savings
There are two stages in which this program is run. The modes of simulation are 1) design mode and 2)results mode.
Design mode :
In design mode, user is provided with an engineering tool box which contains small icons of the components to build models. User can drag and place it in module screen, resize and change attributes as needed, connect them logically as is done in drawing a steam system process flow diagram. When the user places the components on the screen, the user interface property pop up forms ask for the data required for calculations. These properties again appear on the module screen in properties box in module screen .This enables user to access the input properties of the component at any time and change them direct on screen. User can connect the nodes between components drawing lines and providing properties of pipe lines to build a system. Grid points are provided for ease of drawing and building the models. All the User Interface forms are supported by data base properties or linked to design programs where needed.
Results mode:
User runs the calculations for the model built and validation and calculation status are displayed as they progress. Results are displayed in results window in place of engineering tool box in results mode.
User can analyze the results of each connecting point called node and component by viewing the properties box and results window at the same time. This enables user to perform sensitivity analysis or “what if” scenarios by changing the input properties in property box on screen. Results of individual node can also be tracked in addition to viewing the entire component results at the same time. This enables user to analyze the effect of one component input properties on another node of a different component. Grid points provided in the design mode can be turned off in the results mode. User has also option to close the engineering tool box, property boxes and view the results of individual nodes or connecting point .User has also option to resize the property window and results window to view the full size of model built.
Components and calculations :
STEAMDOSS simulation module engineering tool box contains the following components:
Engineering Components :
Boilers: This component can model a fire tube or water tube boiler. User needs to provide data for nodes connecting the fuel, air and feed water and provide boiler operating conditions. The component will display results on Boiler rating , combustion efficiency , thermal efficiency, steam load, fuel consumptions, air flow , excess air , factor of evaporation and heat of absorption in addition to pressure, temperature and enthalpy at each of the nodes connecting a the Boiler component .
Economizer: This component can be connected to the boiler stack node. Data required are feed water inlet properties and pressure drops .Results give the economizer efficiency. User can model a boiler scenario with and without economizer and compare performances
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Deaerator: This component can connect make up water and condensate return lines or sources having data. It calculates flow and process parameters to feed pump and estimates heating steam required.
Pumps : This is a centrifugal pump component ;when modeled, it calculates suction and discharge side process parameters and estimates NPSH required .Separate icons and calculations are provided for feed pumps, transfer pumps and cooling water pumps
Flash tank: This component calculates flash percent and vent steam and condensate drain process parameters. This component is provided for blow down recovery system modeling.
Turbine: This models single and extraction steam turbines. Results are shaft power, efficiency, specific steam consumption and heat rate. Fixed power option is provided when turbine is modeled separately.
Blow down: This component works like flash tank when connected to blow down drain node of boiler component.
Heat exchanger: This component models cross flow and contact heat exchangers. Calculations provided are based on heat balance.
General valves: Ball valve, globe valve, gate valve, pressure reducing valves, butterfly valves are used for drawing the process flow diagrams and valve pressure drop value can be an input for calculation.
Branch –Tee: This component is used for dividing the flow or addition of fluid flow. Pressures need to be balanced at ends when branches are connected .designed for steam and water as fluids.
Hypothetical components :
These are hypothetical components specifically designed with engineering data built in. It is used to start a model or end a model. This enables user to model and evaluate a single component or a partial system model
Source: This provides hypothetical source input data for, liquid, steam, fuel, air, two phase fluids.
Sink: This component used as a terminator for the system modeled.
Loss: This component is used to input losses data in steam systems. Losses can be due to steam leak, steam trap or user defined. User can also estimate the losses with design programs provided.
Notes: This is provided for the user to write title, labels or notes in the diagrams built.
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