Dec 18

gEnergy is the web interface to EnergyPlus

Our software provides a user interface for the EnergyPlus simulation engine. gModeller facilitates easy entry of building geometry and fabric constructions using Sketchup and gEnergy allows the full scope of EnergyPlus objects to be edited.

For detailed information on the actual energy simulation you are best to refer to the Energy plus Input/Output and Engineering Reference manuals:

Input Output Reference (PDF)
Engineering Reference (PDF)

Also, Big Ladder Software provide training on EnergyPlus and have some very good reference material on their website that is easier to navigate.

EnergyPlus Web-Based Documentation

Weather data is available for over 2000 global locations. Data is in a standard, well documented, EPW format so it is also possible to construct your own weather files if you have localised data available of if you wish to push your model through some extreme weather events. The following link provides a map of locations:


The link below is to a guide on using EnergyPlus for producing compliance reports:

Using EnergyPlus for Compliance (PDF)

Nov 18

Interoperability with Other Software

Lesosai is a software for the certification and thermal balance calculation of buildings containing one or more heated or cooled zones. Simple and effective, the monitors adapt the required information to the needs of the chosen standard or label. It is designed primarily for building engineers, HVAC engineers and architects.

The software can be used in the following languages: French, German, Italian and English. It can use many calculation methods, which can be selected one after another.

Lesosai allows the calculation of environmental impacts of the energy consumption, considering the energy used in the building, but also the building’s construction materials (Life Cycle Impacts Analysis / Environmental Assessment). This calculation is based on a building life cycle approach and uses the list of impacts maintained by KBOB (extracted from the Eco Invent database), and the methodology conforming to Swiss Standard SIA2032 (Life Cycle Impacts Analysis complete with ECO+® module).

Compatible BEM (Building Energy Modelling) via the gbxml format.

gModeller by GSL enables the export and import of gbxml models.

gModeller v2.2.4 now has greatly improved performance particularly on MacOS.

Oct 18

GreenspaceLive Impact

To achieve significant and deep interventions required to meet the challenging targets necessitates a decision-making process that evaluates fabric and technology solutions at an early stage in the design process. The interaction between all the different elements can only be evaluated by dynamic simulation which utilises the laws of physics to simulate how an asset should perform.

Projects using energy modelling generally exceed the energy reduction targets and tend to encourage good sustainable design where passive design strategies make bigger impact to curb energy use are evaluated and incorporated to achieve demanding targets. Energy modelling from easily obtained data also helps design teams consider all the elements and their likely impact on carbon use where targets can be set and regularly checked against progress.

To encourage widespread use of dynamic simulation an on-line web and cloud-based approach is offered by GSL which is affordable and much more accessible to the construction industry. With the need for significant investment to achieve energy efficiency targets new initiatives such as Energy Performance Contracting will require the detailed evaluation of the most cost-effective solutions so that these contacts are well prepared, and risks minimised.

Rapid dynamic simulation would benefit a range of building professionals including designers, technologists, fabric specialists/manufactures, energy engineers, contractors and developers.

All investment decisions require good planning and risk informed decision making which in turn requires evaluation of fabric/technology solutions long before and capital expenditure takes place. Optimising the impact of solutions can be evaluated to maximise the rate of return on investment.

Dynamic simulation tools that are accessible and affordable will enable the construction industry to face the challenge of deep interventions and support this `new` business opportunity where 98% of the problem has already been built. In the next ten years a large proportion of existing buildings will require some form of intervention and support with decision making tools of this nature will enable the industry to take technical and investment decisions that will support this intervention opportunity.

A web-based approach allows for on line collaboration where all professionals involved in the projects can communicate and share data virtually which has a resulting productivity gain.

Aug 18

IFC models to gModeller

We have now enabled the latest version of gModeller V2.2.4 to import IFC models with geometrical data via Sketchup Pro.

IFC (Industry Foundation Classes) is about sharing information across software applications and interoperability is a key enabler.

IFC is a data model that is used to describe building data and geometry across building disciplines and across phases of the building life cycle. IFC is both a de-facto standard and an ISO standard. The format is open and has wide industry support. It is a common requirement for BIM interoperability and most of the tools in use in your design and construction projects already support exporting/ importing the format.

The integrated BIM approach also enables the ability to access numerous global software tools.

gModeller gives the ability to produce an idf file format for full dynamic simulation with gEnergy analysis.

Other file formats such as nct for SBEM certification is also available from gModeller.

Download gModeller: gModeller-2.2.4.rbz

Aug 18

First design with GreenspaceLive

At the early building design stage energy modelling can assist with the process of evaluating all the options which can contribute to a high-performance building.

It is now recognised that integrating energy modelling into the building professional’s workflow will result in buildings that can meet high performance expectations.

Early concepts that introduce passive design options and methods to reduce energy requirements can form part of an exercise to determine energy targets achieved by an iterative design process where the model can be modified and tested to maximise performance.

The first Sketchup model can be transformed to gModeller and ready for either deep dynamic simulation gEnergy or energy code compliance assessment programmes.

gModeller enables the export and import of gbxml models.

The new version of gModeller V2.2.2 is now available on line with improved performance!

Early results allow for design refinements where decisions are based on sound technical analysis and good risk informed decision making

Bringing DEEP DYNAMIC SIMULATION to the early stage design process allows the building professional to evaluate numerous design options with the web enabled gEnergy giving the full power of EnergyPlus – the global standard.

Take the early opportunities to improve value!

May 18

gModeller V2.1 Released

Out now and online, the newest gModeller V2.1 to start your Building Performance Simulation!

V2.1 has greatly improved performance particulary on MacOS.

Easy to use based on Sketchup. Go straight to other CAD software with these file formats:

  • gbXML – global energy analysis tools
  • idf – for the global standard EnergyPlus.
  • nct – for UK SBEM and Energy Performance Certificates.

Download Now

Jan 18

Generate EPCs from gModeller

Our customers asked to go directly from gModeller Sketchup to SBEM – now you can!

With the approval bodies requiring tabulated geometric data you can now do that action automatically from your model!

So generate your EPC building model from gModeller.

Dec 17

Custom surface naming in gModeller

Space, surfaces, and openings can now be renamed using a custom naming scheme.

By choosing ‘Custom Rename…’ from the extensions menu, you can enter the new names containing placeholders, for example:

	Spaces: sp-[spaceIndex]
	Surfaces: su-[surfaceIndex]
	Openings: op-[openingIndex]

The placeholders you can currently use are:


Nov 17

gModeller V2 Release

We have listened to our customers and our new V2 has many new features including:

  • Performance of auto-surface space assignment greatly improved
  • Can now apply Sketchup materials to construction type to visualise in rendered 3D view
  • Can now apply glazing properties and window constructions to model
  • Sketchup paint tool can now apply constructions
  • Surface ID tags can now be viewed in 3D model
  • Construction and surface list selection updated when surface is selected in Sketchup

Download the new version at:


Jun 16

RAPIERe wins ‘Collaboration Champion of the Year’ award

At this years Consultancy and Engineering Awards, Rapiere won the prestigious Collaboration Champion of the Year award, fighting off competition from the likes of Network Rail, Crossrail, Arcadis, Jacobs and Apple Inc.

– Richard Newman, CEO, Rapiere Software Ltd


Rapiere Software Ltd is a company consisting of four founder partners; GreenspaceLive, Architype, ChapmanBDSP and Sweett Group. Together we have developed a web-based building simulation platform, that will save construction practitioners time and asset owners money by running multiple building simulation scenarios of cost, carbon and energy to optimise the sustainability of the design.








“Rapiere is a great example of organisations working together across an industry to develop a product that will deliver a real benefit to the creators of our built environment”

– Richard Hill, Director of Cost Consultancy, Sweett Group


For more information about Rapiere Software Ltd, please click here.