7 points every architect, engineer,
contractor and their clients should know about HVAC
components, modules and systems.
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integrated design program has
over 2100 slides illustrating architectural, interior design
and HVAC engineering principles which contribute to
indoor environmental quality and
energy allocation for
conditioning the occupants and building.
The following course materials on components,
modules and systems are samples from the lecture and based on a Steven Covey principle of "Begin
with the End in Mind". They are a very small but important sample of the Covey
principle and are provided here to give you an idea of what
kind of materials we'll be discussing during the program.
The course is also registered with AIA and participants can
earn up to 21 Learning Units.
For more sample slides visit our list of training modules.
Figure 1: We teach HVAC systems using the
LEGO block principle by first describing the components
and how those components are correctly assembled into
modules and then into sub-systems and then sub-systems
into systems. Shown above is one of several component
slides, this one for heating sources with various
thermal storage tank configurations.
We cover the use of low loss headers for heat only, cool
only and heating/cooling systems. Of importance with low
loss headers is keeping the velocity down in the barrel
but ensuring acceptable velocity in the nozzles.
Figure 3: This (again) is just one of
many schematics we discuss during the course. Shown is
the use of thermal bridges for constant flow on
secondary systems (load) and where temperature control
is located on the primary circuit. This is a useful
method for decoupling multiple zones where load shedding
for boiler management is required.
Figure 4: Shown above is a multi zone
system using zone valves connected to a low loss header
fed by two wall mount boilers. We spend some time
discussing the use of zone valves versus circulators for
zoning and how to design systems for lowest Watts/Btu/hr
Figure 5: It makes a difference how
larger heating and cooling plants are assembled. In the
instance on the left all of the differential temperature
is recorded at a single point on the primary circuit
whereas the system on the right records the differential
temperature along three points along the primary
circuit. In the heating mode this means the last boiler
will be fed with a higher temperature picked up from the
first two boilers which is destructive on its
efficiency. Yes you can rotate the firing sequence but
this doesn't best serve the system efficiency under
maximum to moderate loads - for more than two boilers,
systems are better off using the schematic on the left.
Figure 6: For larger reversible heat pump
systems, those which do heating and cooling it is often
beneficial to have separate tanks. These tanks can also
be fitted with diverting valves for bypassing to solar
or evaporative cooling towers or in the case of cooling
to bypass the heat pump directly to the ground loops.
Figure 7: One of several solar schematics
discussed in the course. On the load side is an
auxiliary boiler installed for periods of low solar
contribution. The solar side is fitted with a heat purge
system. We have developed an FEA tool for using the
ground as a place to purge excess heat and will discuss
this in class.
Final comments: There are hundreds of
components in an HVAC system and unfortunately an
infinite number of ways to assemble them - and thus an
infinite number of ways to screw it up. That's why we're
a big fan of standardized factory assembled control
appliances or sub-stations. Anyways, one of the
recurring steam of questions we always get in class goes
something like this, "can't you do it this way?" or
"this is how we do it is that wrong?" or "why do it that
way when you can do it this way?". There was a time in
my career where I would spend countless hours worry
about such things but fortunately age has turned into
wisdom and today I really don't care how you do it so
long as the fundamentals are followed and the systems
work....and so it is the fundamentals that we teach.
So there you have it, a few sample slides
from our components, modules and systems lecturer...just a hors d'oeu·vre
from our library of over 2100 slides addressing a small
but important element of integrated design and radiant
based HVAC systems. In the
program we will get into this and a whole lot
more? How much more? Well just follow the links to the
other parts of our website and you’ll get a feel for the
scope of materials that we’ll be covering.
See you soon.
Registered Engineering Technologist - Building
construction (ASET #8167)
Professional Licensee (Engineering) - HVAC (APEGA
Building Sciences / Industry Development
ASHRAE Committees: T.C.61. (CM), T.C.6.5 (VM), T.C. 7.04
(VM), SSPC 55 (VM)
ASHRAE SSPC 55 - User Manual Task Leader
Note: The author
participates on several ASHRAE and other industry
related committees but be advised the materials and
comments presented do not necessarily represent the
views of these societies, only the president of the
society or nominated representative may speak on behalf
of the organization.