Design

DESIGN is the basic module in energyPRO, which calculates the optimal energy conversions for heat, cooling and electricity for a one-year period. Flexibility and capacity are keywords for this module as it is possible for the user to enter an unlimited number of heat, cooling or electricity demands into the module as well as an unlimited number of different energy units such as cogeneration units, boilers, absorption chillers and heat pumps.

Based on your economic input figures, the module calculates and presents an operation income report for the selected year - this will allow you to design an optimal energy solution using a simple pay back calculation as guidelines for your technical choice.

The calculation model is based on more than 15 years of experience with energy calculations of complex energy systems. The methodology in energyPRO is based on an iterative technique where:

• The productions are prioritised according to a selected control strategy.
• The thermal store and fuels are utilized optimally.
• The number of starts of the plant is minimized.

The calculations will be made under due consideration to any conditions you have specified for the project for instance by entering a degree day table in your demands for part of your heating and cooling demand.

Figure 1: The figure shows the calculated operation periods during a 7 days period for an energy plant, operating in a triple tariff electrical structure, with two gas engines covering a specified heat demand and using a thermal store as buffer.

If you have a multiple price tariff structure for your electricity sale, the program is able to prioritise electrical production of the plant to the highest paid periods under due consideration to the heating / cooling demand. The program is also able to give you a precise calculation in case fuels are limited (waste or biogas) or if the fuel storage capacity is limited (biogas).

For cogeneration projects covering an on-site demand of electricity and heating / cooling, the program can easily calculate the amount of surplus electricity sold to the grid and the split in different tariff periods.

The program is able to calculate all types of combined heat and power units, such as engines (both on diesel, natural gas and biogas) with or without an economizer, steam turbines with or without steam injection, absorption chillers, heat pumps and peak load boilers. The thermal production outputs can either be used for heating, cooling or bypassed to a blow out unit. Load curves and non-operational hours for each energy unit can be defined and included in your calculations.

The economic part of the program is a user-defined module, in which you can create your individual economic report for a specific project. The user defines which revenues and operating costs shall be included in the report by creating the structure of the report (totals / subtotals) and filling in unit prices for different revenue and cost items. The program automatically combines these item figures with the calculated energy conversion figures and the economic report is ready. The program generates two types of economy reports - an operation income report and a cash flow report - for your project. Both reports are on based on a period of one year and can be shown on an monthly basis.

The input data window shows the different elements in a project in a tree structure. This gives you a quick overview and easy access to enter data. When you click on a specified subject in the tree structure, the working window change content to the selected subject and data can be entered or edited.

Figure 2: The main input data window for an energy plant consisting of two gas engines, a peak load boiler plant and a thermal store.

New folders can be added to the groups in the tree structure very easily and can be named according to your own choice.

Heat, cooling and electricity demands can be entered in details either as figures or as data from spreadsheets copied via the clipboard. External conditions such as ambient temperatures (degree days) for your local area can also be imported as spreadsheets using the clipboard.

Load curves for different energy units can be entered into the program and an unlimited number of different tariff periods can be defined and entered into the calculations.

Reports The reports in DESIGN can be displayed on-screen, printed or copied to clipboard. Examples of Reports Click on the report names to see a full-page example of the different print-outs. Energy conversion, Annual Productions graphical In the example the gas engine is restricted to only produce the specified electricity demand.

Figure 3: Report possibilities from DESIGN Duration Curve Cashflow, Monthly Please note, that in the example is used a displaced accounting year.

 



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