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PROFESSOR: Thank you for coming
to the very last session.

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And our moderator for
this session is Nick Fry.

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NICK FRY: Hey,
thanks, everybody.

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So just gather in, and we'll
get into some case studies next.

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The first speaker is going to be
Cary Smith joining us remotely.

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I believe we're going
to have his video up.

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So Cary Smith is pretty
well known in the industry.

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He's an AEE Fellow.

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And he's had about 30 years in
ground source and subsurface

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and almost another 30 years
before that doing other things.

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Then we'll have
Mark Metzner, who

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you heard from earlier, and
Jay Egg, and Susan Murcott

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to follow.

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So if we can cue
up Cary's video.

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CARY SMITH: Hello.

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My name's Cary Smith.

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I hope you're enjoying
the conference.

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Thank you for letting me present
my portion of about ATL systems.

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My presentation will give you
an overview of one-pipe ATLs.

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Depending on how you classify
multibuilding projects,

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we have between 20 and 30
ambient temperature systems

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operating at this time.

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Our first system
was started in 2002,

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in Steamboat Springs, Colorado.

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Other projects include
housing projects,

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a 40-acre heavy equipment
dealer service center,

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a CNS truck track, 7 school
campuses, and, of course,

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additional university campuses
like Colorado Mesa University

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and Weber State University.

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I'd like to describe
what the configuration

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of these ATLs and stuff.

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First, we have a configuration
that basically is a hairpin.

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It's two pipes going up
and down the street, which

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connect to two connected pipes
going up and down the street,

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which are connected
primarily/secondarily

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to these load sink
sources and buildings.

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The second would
be the perimeter,

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or run around system, which
basically goes around the block

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or around the campus.

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These two loops can be--

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two configurations, can
be combined together

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to form a multidistrict
multiasset

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system where we have a central
loop that basically connects

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them.

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And then we have a
submicrodistrict coming off

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that central loop.

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We could also connect directly
to another central loop system.

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Theoretically, these are quite
expandable over a large area.

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Nothing's more
efficient than off.

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An ATL uses an independently
large diameter HTP.

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Pipe attached to that
pipe are hydraulically

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separated independent circuits
serving buildings or system

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assets.

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These assets may be, but are not
limited to, really, greywater

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and blackwater systems, closed
loop and phase change materials.

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That's for storage
or sink source use.

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Solar thermal
systems or PVT energy

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for energy addition
or rejection,

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open loop sources or sinks.

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High to mid temperature
geothermal resources, CHP waste,

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and conventional boilers and
cooling towers for emergencies

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or peak loading.

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This system uses heat pumps
and diversity of loads

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to heat and cool.

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Borehole and phase
change storage

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is diurnal for load shifting
or time of day power reduction,

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or seasonal for
heating and cooling.

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All sequences are bidirectional,
central to building

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or building to Central loop.

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To give you an example of
the control of these systems,

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we have a building
up here that's

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running between 55 and 85.

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If it gets out of
range, what happens

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is it turns the
central loop pump on

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and goes to the central loop.

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Of course, we started with
the first thing we had.

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This central loop is idling.

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So consequently, other
buildings and assets

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are available to this building.

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Finally, if the central loop
and the buildings that are on it

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can satisfy the load,
that's diversity.

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Then we will go to green systems
or like loop fields and PV

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and so forth when
the temperature is

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under 50 or over 85.

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And finally, when the system
gets above its set capacity

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and is no longer able to
maintain this 50 to 85

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and it has all the
green assets on,

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we'll go to boiler cooling
towers for additional energy

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or to reject energy,
basically, under 40 degrees

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or over 95 degrees.

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This is a picture of
the front-end system

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of Colorado Mesa University.

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The central loop supplies fluids
building the heat pump systems.

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We have about 3 and 1/2 miles
of 18-inch central loop pipeline

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in the 5 microdistricts.

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We have currently 19 buildings
on the system itself,

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and 1.3 million square feet.

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These five microdistricts
are interconnected,

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and they can be operated
independently or as one system.

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Let me see.

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There are over 250 gallons of
transport fluid in the system.

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And there are distributed
assets around campus.

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This system uses loop
fields, irrigation water,

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and some potable
water at this time.

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Except for a small
number of hours,

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we have not fired the boilers
to maintain temperature

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in the system since 2012.

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So what we've got here,
we've got loop fields.

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This is district number 1.

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We've got loop fields.

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We've got a pumping station.

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This is a main pumping
station for the central loop.

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It's sized to handle
about 4,000 tons.

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And so district 2 is down here.

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It's a set of dorms.

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It's mostly heating.

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Of course, it's isolated
primary/secondary.

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District 3 is the
Maverick Center.

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In the center here,
we have mixing valves

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and so forth so that
we direct and redirect

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the fluid throughout any
of the microdistricts.

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Down here, we have a classroom
building dorm complex,

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and we have a second
pumping station.

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These two pumping
stations, by the way,

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when they're used together, are
in a kind of a parallel series

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configuration.

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And most of the time, we
only used one or two pumps

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to start with.

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As you might be able to see,
it's kind of small here,

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this is estimate right now.

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The central loop
temperature is 82 degrees.

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And if you notice, we have
none of the assets on.

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This is purely run on building
diversity at this time.

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We do have, by the way,
several buildings on it

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at the same time.

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So as we go through
this, we're currently

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planning on this campus
another 1.3 million

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square foot addition, which is
going to be a sixth and probably

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seventh micro loop.

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This is kind of a nice cartoon.

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What it does is tell
you a little bit about--

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it gives you a little
broader perspective of what--

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we have buildings on the loop.

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They can be commercial,
residential, or industrial.

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They're cooling dominant
or heating dominant.

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It doesn't matter.

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They could be balanced.

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It just depends.

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Then on top of that,
we have a system

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we're able to build solar
PVT, do heat exchange panels

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and so forth.

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We can use air source
pumps built in and made

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as multisource heat pumps,
which basically either use air

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as a source or water as
source, and of course ground

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source heat pumps.

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We may have chillers
on the loop.

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We may have wastewater heat
recovery and heat and heat

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exchangers.

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Or we may have industrial waste.

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And of course, we have ground
heat exchangers, thermal storage

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and water source
heat exchangers.

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All of the system
stuff can be interfaced

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with the electrical grid and
also in PVT panels and so forth.

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But what we do is we operate
the loop in such a way

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that we can shift loads or take
advantage of time of day rates

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and so forth.

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And then also on top of
that, we might turn around

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and have another source of
electricity, river run, wind,

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whatever have you.

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And finally, we can
go with additions

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like conventional
CHP, cooling towers,

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and of course boilers
for emergency.

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The interesting thing is we
can attach other microgrids

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to the loop, consider
that to be opponent.

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This system is emissions free
and uses electrical power.

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And in some cases,
we're starting

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to interface with the telecom
with grid-enabled monitoring,

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automated sequences above the
general management system,

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and monitoring and
intelligent control,

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for example, mapping
the flow of people

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back and forth across campuses,
in and out of city buildings

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and so forth.

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So that concludes
my presentation.

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I hope you enjoyed it.

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And if you've got any
questions, please submit them.

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[APPLAUSE]

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