Progetto SIMEA - Automatica - Università degli Studi di Padova

SIMEA Stato dell’arte energetica degli edifici
1.3.4. HEED
91
Doc.No 20100610.SIMEA.MR.03
Versione 1
This user-friendly energy design tool shows how much money you can save
by making changes to your home. It also shows how much greenhouse gas
(including CO2) it accounts for, and its annual total energy consumption. HEED
(Home Energy Efficient Design) works equally well for remodelling projects or
designing new buildings.
You begin by giving four facts about your building, and the expert system
creates two base case buildings, one that meets the energy code and another that
incorporates more energy efficiency features. Then you can copy one of these and
begin to create your own unique designs. First draw in your home's proposed floorplan, rotate it to the
correct orientation, then click and drag windows to their exact location on each facade. Copy this to
successive schemes and try out various passive solar and energy efficient design strategies such as window
shading, thermal mass, night ventilation, and high performance glazing, etc.
For basic users the easy-to-understand bar chart shows how the energy coat, annual energy
consumption, or CO2 production will change for each different design. For experienced users there are
detailed data input options, plus dozens of 3D graphic outputs that reveal subtle differences in building
performance. Clients will especially appreciate how HEED’s various graphics outputs clearly show the
benefits of good energy efficient design.
Although HEED was developed for ratepayers in California, your own local utility rates and
greenhouse gas factors can be loaded. EnergyPlus climate data files for sites around the world can be read in
directly (see read-usa.txt in the download docs folder).
1.3.4.1. Validation/Testing
HEED has been validated against the ASHRAE Standard 140, HERS BESTest Tier 1 and Tier 2, and
in a five year experimental test cell program. It has also been validated in actual instrumented occupied low
income housing units over two summers.
1.3.4.2. Expertise Required
Special expertise is required in the Basic Design section, so homeowners and ratepayers will recognize
all the terms. The Advanced Design and Evaluation sections are intended for designers, builders and
contractors familiar with energy efficiency issues, and for energy consultants and engineers working on
smaller buildings.
1.3.4.3. Users
As of January 2008 there were 14,792 users. A survey in April 2002 showed 16 % of the users were in
Southern California, 7% were elsewhere in California, 48% were elsewhere in the US, and the remaining
29% were in another country.
1.3.4.4. Audience
Homeowners and ratepayers will be comfortable with the Basic Design section of HEED which
requires no special vocabulary or expertise. Designers and Energy Consultants, familiar with energy
efficiency issues, will appreciate the features of the Advanced Design and Evaluation sections.
1.3.4.5. Input
To start HEED only four facts are required: location, building type, square footage, and number of
stories. With this the expert system creates the two base case buildings called "Meets Energy Code" and