Enter Annual Project Data
Use delivered energy, current factors, and a consistent reporting year.
Fields marked * are needed for a complete screening result.
Example Annual Input Data
| Input | Example value | Purpose |
|---|---|---|
| District cooling | 180,000 kWh/year | Measures delivered cooling from the district network. |
| District heating | 120,000 kWh/year | Measures delivered heating from the district network. |
| Building electricity | 250,000 kWh/year | Captures electricity used inside the project boundary. |
| Baseline emissions | 260,000 kgCO₂e/year | Creates a consistent comparison case for reduction tracking. |
| Floor area | 5,000 m² | Supports the district energy intensity calculation. |
Formula Used
Each formula keeps energy, emissions, and costs separate. This helps prevent factor mistakes.
District Energy = District Cooling + District Heating
Emissions = Annual Energy × Emissions Factor
Total Source Energy = (Cooling × Cooling Factor) + (Heating × Heating Factor) + (Electricity × Electricity Factor)
Reduction % = ((Baseline Emissions − Project Emissions) ÷ Baseline Emissions) × 100
District Energy Intensity = Purchased District Energy ÷ Conditioned Floor Area
How to Use This Calculator
- Collect one full year of district cooling, heating, and building electricity data.
- Enter energy in kWh. Convert other units before using the form.
- Use current district-provider emissions and source factors where available.
- Enter a reviewed baseline emissions value for the comparison result.
- Add unit energy costs to create a simple annual operating estimate.
- Set a team reduction target. Then compare it with the planning indicator.
- Download the CSV or PDF record after checking every assumption.
Purchased District Energy Planning
Start With Clear Boundaries
Purchased district energy supplies heating, cooling, or both from a central network. A project buys useful energy instead of producing it on site. This simplifies equipment rooms. It can change how energy and carbon performance are documented. Good calculations start with measured annual energy. They also need credible utility factors.
The calculator separates district cooling, district heating, and building electricity. This avoids hiding different impacts inside one number. Cooling and heating networks can use different fuels. Their carbon rates can vary by season. Enter factors supplied by the district operator when possible. Use one consistent reporting period. Calendar-year data compares easily.
Source energy is a planning measure. It estimates energy used beyond the building boundary. The source factor converts delivered energy into that broader estimate. A higher factor suggests more upstream energy was required. It is not a carbon factor. Keep source energy and emissions separate. They answer different questions. Both help teams review alternatives.
Carbon calculations multiply annual energy by an emissions factor. The result is annual carbon dioxide equivalent kilograms. Add district cooling and heating emissions. Then add building electricity emissions. Compare the project total with an approved baseline. A positive difference shows lower reported emissions. A negative difference shows the project exceeds the baseline. Review units before accepting results.
Cost inputs provide a simple annual operating estimate. Enter the delivered-energy price for each service. Include demand charges separately if they matter. They are not represented by a simple energy rate. This keeps the calculation transparent. A detailed utility study may need tariffs, seasonal rates, and escalation assumptions. Those items can be added outside this screening tool.
Floor area lets the calculator report district energy use intensity. This value divides purchased district energy by building area. It eases comparisons across different project sizes. Use conditioned floor area consistently. Do not compare gross and net areas without noting it. Small area changes can affect the intensity result.
A custom reduction target provides a practical tracking check. It does not award certification points. It simply compares the calculated reduction with a goal entered by the project team. The target can reflect an owner requirement, design brief, or milestone. Document the baseline source. Document every emissions factor. Keep copies of district utility statements and calculation assumptions.
Results are strongest when input data is current. Ask district providers whether their factors include plant fuel, purchased electricity, distribution losses, or renewable contracts. Clarify factor changes over time. Record the factor year beside each result. Use the same currency and energy units across the model. Convert data before entry, not after.
District energy can support efficient urban systems. It can create data dependencies. The building team needs timely information from the utility. Review contracts, metering boundaries, and service responsibilities early. Recheck calculations after design changes. Recheck them during operations. This calculator organizes that conversation. Final project documentation should be reviewed by qualified sustainability professionals.
Frequently Asked Questions
What is purchased district energy?
It is heating, cooling, or another energy service bought from a shared district network. The building receives delivered energy. The network may serve many nearby properties from central plants and distribution systems.
Does this calculator determine certification points?
No. It is a planning calculator. It does not determine certification, compliance, or credit outcomes. Formal reviews may require specific methods, documentation, boundaries, and approved factors.
Which emissions factors should I enter?
Use factors issued or approved for your project’s reporting method. Ask the district operator about factor year, included fuels, distribution losses, and renewable contracts. Record the source of every factor.
Why are cooling and heating separate?
They can have different generation systems, seasonal performance, prices, and carbon intensities. Separating them produces a clearer annual estimate and makes later updates easier.
What should the baseline represent?
Use the approved comparison case for the project. It should use consistent scope, annual period, and units. Do not use a baseline from another building without confirming it is comparable.
How is source energy different from emissions?
Source energy estimates upstream energy needed to supply delivered energy. Emissions estimate climate impact. They use different factors and answer different questions. One value should not replace the other.
Can I use monthly data?
Yes. Add twelve months of consistent data first. Then enter annual totals. Monthly records are useful because they help identify missing bills, unusual weather effects, and factor changes.
How should renewable energy contracts be handled?
Confirm the reporting treatment with the responsible professional and energy provider. Keep contract terms, allocation details, and the applicable factor methodology with the project records.
Does the cost estimate include demand charges?
No. The displayed cost uses simple energy rates multiplied by annual kWh. Add demand charges, fixed fees, taxes, seasonal prices, and escalation assumptions in a detailed financial model.
Which floor area should I use?
Use the same conditioned floor area definition throughout the project. State whether it is gross or net. Consistent area reporting makes energy intensity comparisons more useful.
Can the results support project documentation?
They can organize preliminary calculations and assumptions. Keep the source bills, factor references, unit conversions, baseline method, and review notes. Formal documentation needs qualified project review.