In general, BREEAM annual daylighting results for HEA-01 Visual
Comfort are not comparable to other apparently equivalent calculations
such as sDA and UDI. This is because the acceptance criteria method
used is different.
By default the sDA results map ...
Specifying Low Flow showers in the DHW dialogue can reduce the demand
of a DHW system by up to 35%. However in many cases, low flow showers
and showers employing Waste Water Heat Recovery may not reduce the
demand at all.
The SBEM database includes a fie...
This patch is required for DesignBuilder v7.1.4.005 for English BRUKL
calculations in which the building has a District Heating System.
* It is required for both SBEM and DSM
* It is not required for EPC calculations whether or not the
building has a...
For English buildings being assessed under Part L 2013 using v6.1.8 /
SBEM or DSM v5.6.b you must set transaction to ‘mandatory issue
property on construction’ – otherwise these will not lodge on the
register.
Part LA 2021 sets out the requirements for Display Lighting in New
Buildings:
i. have an average light source efficacy of 80 light source lumens per
circuit watt
* Simply set the luminous efficacy for the display lighting system
ii. have a rated powe...
Interfaces to SBEM v6 (including DesignBuilder 7.1) raise an error and
do not complete the calculation for buildings which have no heated
zones.
This is because SBEM checks that the model includes a non-zero setting
for Foundation Area (as defined in the...
When you run an EPC calculation using SBEM v6.1b, the TER may be
negative in some cases, and while this doesn't prevent the XML being
generated, it will fail to lodge.
Negative TER values can be generated by the latest version of SBEM
because the 2021 No...
FOUNDATION AREA
A new term 'Foundation Area' has been introduced with the 2021 NCM. It
is defined as:
Foundation Area = Total conditioned Area / Nstoreys
DesignBuilder v7.1 calculates the Foundation Area automatically using
this formula and uses the in...
When loading existing SBEM models into v7.1.0.115 and later, the NCM
version is automatically updated to v6.1b. You can check this on
the Project Details dialog.
It isn't possible to calculate summer design cooling loads for each
hour by simply summing internal gains for that hour because it is
necessary to take into account the building thermal mass, as well as
the difference between convective and radiant heat t...
Glaser diagrams use the concept of "equivalent thickness of air" on
the X-axis which defines the amount of resistance to moisture
diffusion relative to the equivalent thickness of air. When layers
are compressed together this means that they offer little ...
