Progetto SIMEA - Automatica - Università degli Studi di Padova

SIMEA Stato dell’arte energetica degli edifici
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Doc.No 20100610.SIMEA.MR.03
Versione 1
"More Energy Efficient". From this point users can copy and revise up to seven more schemes to more
precisely represent their building and to test various energy design alternatives. Floor plans can be easily
drawn in using HEED’s fill-in-the-squares technique. Windows can be clicked and dragged to their correct
size and location on each façade. The building can be graphically rotated to its correct orientation (see screen
shots). The Basic Design information is input by click and drag or by selecting from check lists. The
Advanced Design inputs are tabular inputs for all variables in the program including thermal characteristics,
dimensions, schedules, etc.
1.3.4.6. Output
HEED is unique in that all of its performance data is presented graphically, in a wide array of formats.
The basic output is a bar chart of fuel and electricity annual costs using local utility rates for up to nine
different schemes. This bar chart can also show comparative annual energy consumption and the CO2
production, and total annual (site) energy consumption. Advanced outputs includes 3D plots for each hour of
dozens of different variables including heat gain an loss for sixteen elements of the building's total load, plus
outdoor and indoor air temperatures, air change rate, furnace and air conditioner outputs, power for lights
and for fans, and gas and electricity costs.
1.3.4.7. Computer Platform
HEED runs on all versions of Windows from 95 to Vista, and also on Mac OS 10.2 or later.
1.3.4.8. Programming Language
HEED graphic user interface is written in Java and C++. The Solar-5 computation kernel is written in
Fortran.
1.3.4.9. Strengths
HEED's strengths are ease of use, simplicity and clarity of input data, a wide array of graphic output
techniques, computational speed, and the ability to quickly compare multiple design alternatives. It can
calculate the window-specific daylight reduction of electric lighting loads. It includes an intelligent wholehouse
fan thermostat and window-dependent operable solar controls. HEED calculates the air pollution
implications of design decisions. It can automatically manage up to nine schemes which can be assembled
into any number of projects.
1.3.4.10. Weaknesses
Works best for single-zone buildings, although it can aggregate up to four adiabatic zones. It has
generic HVAC systems. Operating schedules in the current version are limited to residential buildings. It
contains utility rates for California’s five major utilities, but they can be user-modified for most types of rate
structures. HEED comes with climate data for all 16 California Climate Zones, both of which can be
accessed for hundreds of California zip codes. HEED can also directly read Energy Plus climate data for
over a thousand sites around the world (see read-usa.txt).