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ASHRAE Technical Committee 4.7 - Energy
Calculations
FAQ Page
Welcome to our frequently asked questions page. The
FAQ presented here attempts to answer common questions
about the work of TC 4.7. In addition, the TC has
prepared a Technical Bulletin aimed at answering some
technical questions regarding estimating building energy
usage.
Section 1: General questions about TC 4.7
1.1
What are the aims and scope of TC4.7?
1.2
How is TC 4.7 organized?
1.3
What is the scope of the Simulation and Component models
Subcommittee?
1.4
What is the scope of the Inverse methods
Subcommittee?
1.5
What is the scope of the Applications
Subcommittee?
1.6
What is the scope of the handbook
subcommittee?
1.7
What standards is TC4.7 responsible for?
1.8
How can I contribute to TC 4.7?
- 1.1 What are the aims and
scope of TC4.7?
- ASHRAE's Technical Committee 4.7 'Energy
Calculations' is concerned with identifying,
evaluating, developing, and recommending procedures
for calculating energy performance of buildings.
Accordingly, TC 4.7 procures research projects,
organizes program events, prepares handbook
information and is responsible for standards relating
to energy calculation.
- 1.2 How is TC 4.7
organized?
- TC 4.7 is organized as a main committee with four
subcommittees. The three topical subcommittees are
Applications, Inverse methods, and Simulation and
Component Models. In addition, a handbook subcommittee
prepares and updates the Energy Estimating and
Modeling Methods of the Handbook of Fundamentals.
Research, Programs, and Standards are handled by each
of the topical subcommittees, with all activities
coordinated by one member of the committee.
- 1.3 What is the scope of
the Simulation and Component models
Subcommittee?
- The Simulation and Component Models subcommittee
is concerned with the development of deterministic
models, algorithms, and computational frameworks for
energy calculations. This includes models of both
building heat transfer, and HVAC
plant/equipment.
Deterministic models are the
basis of what are normally thought of as 'energy
calculation programs' and also 'component' and
'equation' based simulation programs. Such models are
commonly used in the 'forward' mode - performance is
the output of the model given boundary conditions and
model parameters. The input data and parameters of
such models can come from design data and historical
weather data, but can also come from measurements and
a calibration process.
- 1.4 What is the scope of
the Data-driven Modeling Subcommittee?
- The Data-driven Modeling subcommittee is concerned
with development of models, algorithms and
computational frameworks for energy calculations that
use existing (historical) building energy consumption
data.
Such models and algorithms are used to
analyze the energy impact of retrofits to existing
buildings and in support of energy management
decisions. These models can be thought of as working
in 'backwards' mode and use historical data and fewer
estimated parameters. They are aimed at modeling 'as
built' energy performance.
- 1.5 What is the scope of
the Applications Subcommittee?
- The Applications subcommittee is concerned with
the application of both deterministic and inverse
methods to the following activities:
- Design of new buildings and systems
- Assessing the energy impact of design retrofits
- Supporting energy management decisions
- In support of energy codes (e.g. ASHRAE standard
90.1).
- 1.6 What is the scope of
the Handbook Subcommittee?
- The Handbook subcommittee is concerned with
developing and maintaining material that appears in
the ASHRAE handbooks relating to energy calculation.
The subcommittee works with handbook subcommittees of
other TCs and the special publications department of
ASHRAE in preparing the handbook material on a regular
handbook update cycle. TC 4.7 is currently responsible
for the 'Energy Estimation and Modeling Methods'
chapter in the 'Fundamentals' Handbook.
- 1.7 What standards is
TC4.7 responsible for?
- TC 4.7 is responsible for the following standards:
- ANSI/ASHRAE Standard 140-2001: Standard
Method of Test for the Evaluation of Building Energy
Analysis Computer Programs. This standard now
has its own standing standards project committee
(SSPC 140).
- 1.8 How can I contribute
to TC 4.7?
- TC 4.7 meets at ASHRAEs semi-annual meetings. The
meetings are open for anybody to attend - ASHRAE
members, non-members and visitors. The committee (and
other interested parties) also communicate using an
email list. All of the work of the committee is done
on a voluntary basis. You do not have to be a formal
member of the committee to volunteer for anything
although some activities, such as project evaluation
subcommittees require meeting attendance for
participation. ASHRAE keeps a roster of the committees
voting members and corresponding members. If you want
to be a corresponding member you can fill in a card at
the summer meeting when the roster is updated.
You do not have to be a formal member of the
committee to be on a subcommittee. The subcommittees
are often looking for volunteers to organize program
events and prepare research project proposals (RTARs
and Work statements). If you are interested in working
on a research proposal you are encouraged to find one
or more other people involved with the relevant
subcommittee to work with.
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4.7