The Better Business Case Framework (BBC) is designed around an internationally recognised best practice standard, the five-case model. This builds a business case proposal by answering five core questions:
In combination with our in-house expertise in Better Business Case Framework (BBC), building science and certified Passive House (Passivhaus) Projects we can enable your team to make smart decisions with objective analysis and consistent information for public value.
What is a Passive House?
The Passive House movement has slowly made its way around the globe, since its inception in the early 1990’s. Founded from research into the relationship between thermal comfort and passive design, the standard’s success is testament to the strength of concept. The primary reasons for the application of Passive House fall largely into three areas
One of the key strengths is that, to date, it is the only standard where the built performance matches the design predictions quite closely, i.e. that there is no performance gap.
As we spend about 90% of our time indoors, the quality of the interior environment is more important than ever, especially for children; the quality of environment can have considerable impact on the occupants.
The passive house is not a brand name, but a construction concept that is open to all - and has proven itself in practice. The passive house is more than "just" an energy-efficient house:
A passive house consumes 90% less heating heat than a conventional building in the building stock. And even compared to an average new construction, more than 75% is saved. The heating energy consumption of a passive house with a 1.5 l heating oil equivalent per square meter of living space and year is many times lower than that of a low energy house. Special windows and a shell made of highly effective thermal insulation in exterior walls, roof and floor slab keep the heat in the house. The Passive House uses the energy sources inside it, such as the body heat of people residing in it or incident solar.
Whole building analysis - all constructions are evaluated against building individual design and climate location
Detail analysis - all constructions are evaluated for sufficient insulation values, moisture risks and thermal bridging which leads to
Durability - build to last longer than 15 years
Energy consumption - know how much energy you will use and how it compares to Building Code, or Passive House
Finance - return on investment
Carbon emissions - operational energy consumption and resulting carbon emissions, or material carbon emissions
Comfort - consistent indoor temperatures for all surfaces and healthy indoor air
Certification - Passive House, or Low Energy Building, Homestar, Green Star, or just better than Building Code
WUFI® is a family of software products that allows realistic calculation of the transient coupled one- and twodimensional heat and moisture transport in walls and other multi-layer building components exposed to natural weather. WUFI® is an acronym for Wärme Und Feuchte Instationär—which, translated, means heat and moisture transiency. WUFI® software uses the latest findings regarding vapor diffusion and moisture transport in building materials. The software has been validated by detailed comparison with measurements obtained in the laboratory and on IBP’s outdoor testing field.
WUFI® 2D expands the scope of WUFI® Pro to two-dimensional analysis. A one dimensional WUFI® Pro analysis cannot be used when regions next to the line of interest have different heat and moisture responses. In particular, two dimensional analyzes are necessary for compliciated geometries, such as building corners, window locations, and foundation connections and when there are non-uniform souces/sinks of heat and moisture.
Compared to WUFI® Pro, the inputs for WUFI® 2D are considerably more complex, and the computational time is also significantly increasing. Given the ease-of-use of WUFI® Pro, it is most desirable to keep the analysis one-dimensional. Indeed many situations, including those with ventilation and rainwater infiltration, can still be effectively analyzed in one dimension. As such, WUFI® 2D should be more generally thought of as a complement and not an alternative to WUFI® Pro.
Isotherms are lines of the same temperature and can be used to identify thermal bridges in the building envelope and to demonstrate compliance with thermal insulation.
Thermal bridges can lead to increased heat losses and low surface temperatures that can attract mould growth and subsequent rot in the affected materials.
The determination of temperature distributions and heat flows in complex building constructions can only be carried out with sufficient accuracy with the aid of computers.
With the help of suitable thermal bridge programs and simulation software, extensive facade areas as well as sophisticated building connections and special constructions can be analyzed.
In this way, thermal bridges can be identified and appropriate retrofitting measures verified as early as the planning stage.
U-value calculation of wall structures, windows, roller shutter boxes, doors, skylights, mullion-transom structures, frame elements, rear-ventilated facades, and much more.
Calculation of the heat transfer coefficients of linear (psi-value) and point-like (chi-value) thermal bridges, e.g. as part of the detailed thermal bridge analysis required for Passive House certification.