<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>
<br><div class="gmail_quote">On Fri, Mar 4, 2011 at 12:26 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">
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 class="im"><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 class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
<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>
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