O2C, the carbon tool from lifecarbontool for plants


A carbon footprint evaluation tool. The O2C carbon calculator will allow you to evaluate Greenhouse Gas emissions from wastewater treatment, drinking water, or desalination plants in the construction phase or during operation.

An adjustable parameter. The calculator offers you the option of conducting simulations on:

  • the overall perimeter of a plant by entering operation and construction data,
  • the restricted perimeter of a plant by entering operation and construction data.

An exhaustive approach to greenhouse gas emissions. Whether for the construction of a plant or for its operation, the greenhouse gases generated in the following ways shall be taken into account (if applicable):

  • Energy consumption (fuel, electricity, natural gas, etc.)
  • Procedures specific to the water and waste management businesses
  • Production of inputs (reagents, consumables, construction materials, equipment, etc.)
  • Movement of persons
  • Transport of goods, sludge, waste, materials (incoming freight, internal freight, outgoing freight)
  • Waste treatment and sludge processing

A dynamic, scalable online tool. The O2C calculator allows you to :

  • create and record plant scenarios confidentially
  • update greenhouse gas reports periodically online
  • compare scenarios 2×2
  • share results online with the users of your choice
  • export data and results in an easily usable format (pdf, excel)

An up-to-date evaluation tool. The emission factors for the O2C tool come from public sources (Ademe – Carbon Audit®, ASTEE, etc.) as well as investigations conducted by the CIRSEE.
This is true in particular with emissions related to the decomposition of organic materials in anaerobic conditions (CH4) or the treatment of nitrogenous shapes (urea, ammonium, proteins) present in water (N2O generated during the nitrification and denitrification phases). Research into these matters has appeared in recent publications.
One of the specific features of O2C is that it integrates direct emissions from CH4 and N2O related to waste water treatment processes and allows the periodic update of emissions factors.

A “standards” tool. The tool relies on Life Cycle Analysis (LCA) and the greenhouse gas metrics (ISO 14040) defined by international guidelines. It includes the methodological rules of ADEME‘s Bilan Carbone® audit in France, and is based on the guide published by them ASTEE

Data required to start an O2C evaluation

  • Plant characteristics (gross water and quality of treated water output by the plant)
  • Plant operation audits (activity data)
  • Items related to the construction of the plant (construction materials, evacuated materials, equipment, energy used during construction, etc.)

VELUX Energy and Indoor Climate Visualizer


VELUX Energy and Indoor Climate Visualizer is used to evaluate the performance of single-family houses with respect to energy, ventilation and indoor climate. It is intuitive to use and can be used by anyone with moderate to basic knowledge of building technology. It is based on a recognised and validated simulation engine to provide accurate and reliable results.

VELUX Energy and Indoor Climate Visualizer focuses on windows and solar shading and their effects on the energy consumption for heating, ventilation, cooling and lighting. It has flexible control options for natural ventilation and solar shading.

Besides energy demands, other output includes ventilation rates for the building and each individual window as well as the air temperature in the building through the year. Based on the actual daylight availability in the house, the electricity consumption for lighting is calculated. The airflow through windows can be animated.

VELUX Daylight Visualizer


VELUX Daylight Visualizer is a simple tool for daylighting design and analysis. It is intended to promote the use of daylight in buildings and to aid professionals by predicting and documenting daylight levels and appearance of a space prior to realization of the building design.

The Daylight Visualizer intuitive modeling tool permit quick generation of 3D models in which roof and facade windows are freely inserted. The program also permits users to import 3D models generated by CAD programs in order to facilitate a good workflow and provide flexibility to the model geometry.

Other features include predefined settings, a surface editor, site specifications, flexible view settings as well as multiple daylight parametrics providing accurate predictions. Simulation output: luminance, illuminance, daylight factor and daylight/sunlight animation.



The Sensor Placement + Optimization Tool SPOT™

SPOT assists a designer in quantifying the existing or intended electric lighting and annual daylighting characteristics of a given space, produce a variety of daylighting performance metrics and reports, and to help establish the optimal photosensor placement for the space relative to annual performance and annual energy savings.

The software can be used for all types of spaces, though is limited to simple orthogonal geometry. SPOT™ handles top and side daylight sources and can model any electric lighting source. The software uses a Microsoft® Excel platform with a RADIANCE engine.



The BEopt™ (Building Energy Optimization) software provides capabilities to evaluate residential building designs and identify cost-optimal efficiency packages at various levels of whole-house energy savings along the path to zero net energy. BEopt can be used to analyze both new construction and existing home retrofits, through evaluation of single building designs, parametric sweeps, and cost-based optimizations.

BEopt provides detailed simulation-based analysis based on specific house characteristics, such as size, architecture, occupancy, vintage, location, and utility rates. Discrete envelope and equipment options, reflecting realistic construction materials and practices, are evaluated. BEopt uses existing, established simulation engines (currently DOE2.2 or EnergyPlus). Simulation assumptions are based on the Building America House Simulation Protocols.  The sequential search optimization technique used by BEopt:

  • Finds minimum-cost building designs at different target energy-savings levels,
  • Identifies multiple near-optimal designs along the path, allowing for equivalent solutions based on builder or contractor preference.

BEopt has been developed by the National Renewable Energy Laboratory in support of the U. S. Department of Energy Building America program goal to develop market-ready energy solutions for new and existing homes.



HOMER is a computer model that simplifies the task of designing distributed generation (DG) systems – both on and off-grid. HOMER’s  optimization and sensitivity analysis algorithms allow you to evaluate the economic and technical feasibility of a large number of  technology options and to account for variations in technology costs and energy resource availability. Originally designed at the National Renewable Energy Laboratory for the village power program, HOMER is now licensed to HOMER Energy.

HOMER provides the detailed rigor of chronological simulation and optimization in a model that is relatively simple and easy to use. It’s adaptable to a wide variety of projects. For a village or community-scale power system, HOMER can model both the technical and economic factors involved in the project. For larger systems, HOMER can provide an important overview that compares the cost and feasibility of different configurations; then designers can use more specialized software to model the technical performance.

HEED: Home Energy Efficient Design


See how much energy and money and carbon you can save by making various design or remodeling changes to your home with this free  easy-to-use program. You can draw in the floor plan of your own house, then click and drag your windows to their correct location. You can select from lists of typical wall and roof construction. For advanced users there are more detailed design data input options and output display graphics from the original Solar-5. HEED self installs as a stand-alone program on everything from Windows XP or later and Macintosh OS X 10.6 or later. HEED also runs in Spanish.

Use HEED software to generate home design scenarios by modifying building configuration (shape, size, orientation), building components (e.g., windows, lighting, space conditioning equipment) and building assemblies (walls, roof, foundation),

Simulate the annual energy consumption, energy cost, and greenhouse gas emissions of any home design in any climate,

Readily compare these factors for multiple home design scenarios,

Fine-tune designs to optimize the energy performance of net zero energy homes.