Heat Duty and Utility Consumption — online
Heat duty for up to 10 process streams, the steam, cooling water, refrigeration or fuel each one needs, and the yearly utility bill.
Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 39) — the Guide, method and references are in the Excel file.
What this heat duty and utility consumption calculator does
Turn a stream list into utility demand and a yearly cost in minutes. Heat duty for up to 10 process streams, the steam, cooling water, refrigeration or fuel each one needs, and the yearly utility bill.
- Up to 10 streams. Fluid, flow, inlet and outlet temperature and pressure — boiling and condensing included.
- 10 utilities. LP, MP and HP steam, cooling and chilled water, refrigeration, electric heater, fired heater, hot oil and heat recovery.
- Your site data. Utility prices, steam pressures, efficiencies and COP with editable defaults.
- Totals by utility. Duty, utility use, MWh per year and cost per year, by stream and by utility.
- Feasibility checks. Heating or cooling direction and utility temperature checks for every stream.
- Heat recovery hint. Flags when the plant both heats and cools, so a heat recovery study may pay.
What you enter
- Units (apply to the whole column)
- Operating hours per year
- Concentration for solution streams (% by mass)
- Specific heat for 'Other fluid' streams
- LP steam pressure (saturated)
- LP steam price
- MP steam pressure (saturated)
- MP steam price
- HP steam pressure (saturated)
- HP steam price
- Cooling water temperature rise
- Cooling water supply temperature
- Cooling water cost (per m³ circulated)
- Chilled water temperature rise
What you get
- Total
- Total heating duty
- Total cooling duty
- Streams evaluated
- Total utility cost per year
- Heat recovered between process streams
- LP steam: saturation temperature / latent heat
- MP steam: saturation temperature / latent heat
- HP steam: saturation temperature / latent heat
How it was checked
Stream duties within 0.1 % of reference equation-of-state results (methanol, toluene, n-hexane, air, steam).
Related
- Free quick calculator — a simpler free version for a fast estimate.
- Calculation guide — the equations behind this tool, with a worked example.
- Heat Duty and Utility Consumption Excel tool — USD 39, keep the workbook and its Guide.
- All 40 online tools
Questions
Is the heat duty and utility consumption calculator free?
You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all 40 online tools (USD 15) or a yearly one (USD 99).
Are the results the same as the Excel tool?
Yes. The online tool runs the formulas of the Heat Duty and Utility Consumption Excel workbook, checked cell by cell against the Excel file.
Which units can I use?
SI, US customary and British units — choose the unit next to each input.