<div>Thanks Ery.<br></div><div><br></div><div>It helps. It's just slow. What I love about LS-C is that it's fast. Do you know of a way to get a grouped report for all walls within a particular zone. So instead of having hourly output for every wall in a space, you would have one for each: exterior walls, interior walls, etc? This would make reviewing these outputs much faster!</div>
<div><br></div><div>Thanks!</div><div><br></div><div>Karen</div><br><div class="gmail_quote">On Fri, Mar 4, 2011 at 6:52 PM, Ery Djunaedy <span dir="ltr"><<a href="mailto:ery.mailinglist@gmail.com">ery.mailinglist@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">
<div>Hi Karen,</div>
<div> </div>
<div>Same here, I always use LS-C when I use eQuest. Just adding the
ventilaton load, then you will have the peak load. Its always fun
to compare this number with what the mechanical engineer has.</div>
<div> </div>
<div>I said earlier, in EnergyPlus it is not nicely formated like
LS-C. It does not mean you cannot have it. You can force EPlus to
show the numbers. The internal gains are the easy ones, the
windows are also relatively easy, the last pieces are the opaque
"conduction" and the ventilation load. Which is not difficult.<br>
<br>
The problem is what peak to report? You will have the peak of the
total gains, which will happen at a different timestep then the
peak of the cooling load. And these two, in turn is different with
the zone sizing report.<br>
<br>
I personally use the zone sizing reports as the peak loads, and I
will get all the details by running the designday run with
schedules consistent with the design day schedule.<br>
<br>
Hope this helps,<br><font color="#888888">
<br>
Ery<br>
<br>
</font></div><div><div class="h5">
<div class="gmail_quote">On Fri, Mar 4, 2011 at 12:00 PM, Karen
Walkerman <span dir="ltr"><<a href="mailto:kwalkerman@gmail.com" target="_blank">kwalkerman@gmail.com</a>></span>
wrote:<br>
<blockquote style="border-left:1px solid rgb(204, 204, 204);margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote">
<div>Hi Ery,<br>
</div>
<div><br>
</div>
<div>Thanks for this explanation. I have been struggling with
this topic as well as I do more modeling in Energy Plus.
However, there is one thing that you did not address above.
While DOE2's LS-C report may not match exactly to what
systems are seeing as far as loads, it does give an easily
readable report which allows you to check your inputs. I
review it quite often as a quality control check for my
models. It also allows me to target energy saving measures,
and helps me explain to clients why certain changes might make
sense for their building. For example, one client might be
interested in increasing roof insulation, but if they have a
multi-story building with a relatively small roof, and lots of
wall area, it makes more sense for them to reduce thermal
bridging in their wall construction. Having a model-generated
report makes this process much faster for me.</div>
<div><br>
</div>
<div>Do you have any suggestions with regards to Energy Plus of
ways to achieve the above goals with the currently available
reports?</div>
<div><br>
</div>
<div>Thanks.</div>
<div><br>
</div>
<div>--</div>
<div>Karen</div>
<font color="#888888"><br>
</font>
<div class="gmail_quote">
<div>
<div>On Fri, Mar 4, 2011 at 12:26 PM, Ery
Djunaedy <span dir="ltr"><<a href="mailto:ery.mailinglist@gmail.com" target="_blank">ery.mailinglist@gmail.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote style="border-left:1px solid rgb(204, 204, 204);margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote">
<div>
<div>
<div text="#000000" bgcolor="#ffffff">Sandeep,<br>
<br>
This is what I call a legacy topic from the DOE2 era.
You better search the posts in EnergyPlus support
mailing list. Search for "cooling load component", and
you will find an interesting discussion.<br>
<br>
In summary, you will not find a cooling load component
report in EnergyPlus nicely formatted a-la LS-C report
in eQuest/DOE2.<br>
<br>
If you try to match the total gains v.s. the cooling
load for every time step, then you will be in for a
long ride. Take the solar radiation gain, for example.
The GAIN for a particular time step is not necessarily
converted into cooling LOAD at the next time step. If
your building is thermally massive, then the delay
plays an important role and it could be hours before
the solar radiation GAIN becomes an actual LOAD as
seen by the thermostat. Do not forget about this, if
you try to match the cooling load report with the
total gains.<br>
<br>
If you are talking about peak cooling load, then you
will need to focus on the zone sizing report.
Calculating the gains component is easy because the
schedule is always 100% on. You just need to quantify
the ventilation load.<br>
<br>
Please note that the report suggested by Paul below is
the convection report. I imagine that you would expect
a conduction report? EnergyPlus zones technically
cannot see conduction through opaque surfaces, in the
sense of A*U*DeltaT. They can only see convection and
radiation. In fact, if you try to match A*U*DeltaT for
external wall with this report (Surface Int Convection
Heat Rate) then you will have a hard time explaining.
If you keep this in mind, the differences can be
easily explained.<br>
<br>
Cheeers,<br>
<font color="#888888"><br>
Ery</font>
<div><br>
<br>
On 03/04/2011 07:07 AM, Paul Raftery wrote:
<blockquote type="cite">
<div>Hi Sandeep,</div>
<div><br>
</div>
<div>A full list of the available output variables
are given in the .rdd file (it is one of the
files output from the simulation). Simply copy
the relevant line from that file into your .idf
(or .imf) file, rerun the simulation, and the
new variable(s) will be output to the .csv and
.eso files.</div>
<div><br>
</div>
<div>e.g. Adding this line to the input file will
give you the convective heat gain from all
interior surfaces in your model.</div>
<div>Output:Variable,*,Surface Int Convection Heat
Rate,hourly; !- Zone Average [W]</div>
<div><br>
</div>
<div>Regards,</div>
<div>Paul</div>
<br>
<div class="gmail_quote">On 4 March 2011 13:50,
Sandeep Kachhawa <span dir="ltr"><<a href="mailto:sandeep.kachhawa@gmail.com" target="_blank">sandeep.kachhawa@gmail.com</a>></span>
wrote:<br>
<blockquote style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex" class="gmail_quote">
<div>Dear All</div>
<div> </div>
<div>Can we get the individual break-up of
cooling load in <b>EnergyPlus</b>? Internal
loads (People, Equipment & Lighting),
Infiltration loads and Window gains are
available but the <b>gians from Walls and
Roof is missing. </b>Surely EnergyPlus
does calculate all the above loads to size
the Cooling Equipment but there is no such
specific output.</div>
<div> </div>
<div>Regards</div>
<div>Sandeep Kachhawa</div>
<br>
</blockquote>
</div>
</blockquote>
<br>
</div>
</div>
<br>
</div>
</div>
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