ASHRAE Journal - July 2022 - 31

TECHNICAL FEATURE
documents will not be correct. As
such, the architect spends a signifi -
cant amount of time ensuring correctness
and, therefore, much of the
window data is curated.
In most cases, however, the architect
does not care about the thermal
properties of the windows. In these
cases, the window size and location
data would be used, while the thermal
properties would be overridden.
An additional example of curated
data would be lighting power.
Effi cient electrical engineers set the
correct power on their lighting fi xtures
so they can use BIM for panel
scheduling.
The data that is curated in models
is constantly improving. More and
more electrical engineers are using
BIM for panel schedules. With the
adoption and enforcement of energy
codes, a day may come when architects
begin adding thermal properties
to their models. In the meantime,
BIM tools provide mechanical
engineers effi cient ways to validate
data and then override data they
fi nd objectionable.
Why Use BIM for Loads?
Using BIM for loads will allow the
user to design better mechanical
systems quicker and more profi tably,
which will improve a company
overall for the following reasons:
* Accurate load calculations
should come fi rst on any project. In
theory, all system and equipment
selections should be based on an
actual load calculation. In practice,
the architect needs to account for
mechanical space and budget early
in the project. Since traditionally
load calculations are extremely labor
intensive and expensive to run,
engineers tend to push off calculating
loads until the project is more
developed. Instead of using actual
loads, engineers use experience
and rules of thumb for those initial
system selections.1
Whether this is the correct system
for the fi nal building is rarely revisited
because a change at the later
stages of design could mean project
delays. As CAD and BIM have made
major design changes easier, clients
are more likely to request them, and
architects are more likely to capitulate.
Often the building that ends
up getting built doesn't resemble
the initial design the HVAC system
was selected for. Using BIM for loads
allows multiple load calculations to
be run in less time than a single load
calculation would be using a traditional,
manual method.
* Loads are error-prone. Fat
thumbs don't just apply the rules
we use to size the initial system.
Fat thumbs also cause data to be
incorrectly entered into third-party
loads programs. Accidentally keying
in a " 10 " for window area when
we meant to key in " 100 " could
potentially cost hundreds of hours
stuck in meetings, arguments and
litigation. The architect has already
modeled and verifi ed the window
data; remeasuring and manually
entering the data is redundant,
but also increases the possibility of
errors.

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ASHRAE Journal - July 2022

Table of Contents for the Digital Edition of ASHRAE Journal - July 2022

Contents
ASHRAE Journal - July 2022 - Intro
ASHRAE Journal - July 2022 - BB1
ASHRAE Journal - July 2022 - BB2
ASHRAE Journal - July 2022 - Cover1
ASHRAE Journal - July 2022 - Cover2
ASHRAE Journal - July 2022 - 1
ASHRAE Journal - July 2022 - Contents
ASHRAE Journal - July 2022 - 3
ASHRAE Journal - July 2022 - 4
ASHRAE Journal - July 2022 - 5
ASHRAE Journal - July 2022 - 6
ASHRAE Journal - July 2022 - 7
ASHRAE Journal - July 2022 - 8
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ASHRAE Journal - July 2022 - Cover3
ASHRAE Journal - July 2022 - Cover4
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