<div>Terry,</div>
<div> </div>
<div>I took a look at your model file. Here's a few things I notice even before I could look at your heating systems.</div>
<ol>
<li>You file takes a REALLY long time to open--from observation you have way too many zones (think "thermal zones", not spaces.) There is no need in a simulation model to simulate/zone each space individually. You should combine thermal zones that are similar in thermal characteristics (i.e. same exterior exposure, same space type occupancy, etc.) It makes the model & variables too complicated to manage when you are giving attention to very space in your building design. For your sake, and anyone reviewing your model you should go back to the wizard and simplify your zoning patterns. This will help to reduce the number of inputs that you have to pay attention too as well.</li>
<li>In your 3-d model view you have some spaces on the second level that do not have exterior wall constructions. You may or may not have noticed the spaces with "white" walls or effectively no ext. walls. Your sim calcs are not accounting for thermal & energy losses across these spaces, so your loads will be underestimated in the program and thus your overall energy consumption will be under-estimated. This issue happens when you do not line your zone outlines up with your building footprint ext wall outlines. To fix the probelm you will need to go back to wizard mode and re-enter your zones for those spaces. (I can talk you through this if you need assistance with it.)</li>
<li>When I run the simulation you have results (energy consumption) for Misc. Equipm under gas consumption. What type of equipment are you simulating for misc. equip. gas consumption? Seems not right to me, but I don't know the details of your project...school & classrooms I assume.</li>
<li> Looking at your BEPU/BEPS reports you have 89% unmet loads. Looking at the SS-F reports you have issues of underheating & undercooling, which is signifying that conditioned air is not getting to where it needs to go---what's blocking it? ...I'm trying lots of things--(lesson: don't be afraid to do experiments and test your inputs. </li>
<li>For your undercooling try removing (undefine) your cooling availability schedule that is defined in the systems-cooling control tab.</li>
<li>For your underheating, add baseboards at both the system level and zone levels, specify thermostatic (not outdoor air) and some amount of capacity at the zone level (like -50000.)</li>
<li>For any other unmet hours you will need to experiment with your inputs primarily the schedules or controls inputs, this is likely where your unmet conditions are steming from. Ask yourself what would contribute to cooling not being met in the space and then investigate the different inputs that might (or might not) affect the situation. This is where the engineering analysis and scientist abilities come into play and can differentiate between any old energy model and a good quality energy model. It is up to you to best represent what your client is asking for.</li>
</ol>
<div>Good luck with the rest of your model, come back and ask more questions when you come upon them.</div>
<div> </div>
<div>Pasha</div>
<div> </div>
<div> </div>
<div>On Mon, May 10, 2010 at 6:57 AM, Terry Budd <span dir="ltr"><<a href="mailto:terry@leesgood.com" target="_blank">terry@leesgood.com</a>></span> wrote:<br></div>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div lang="EN-US" vlink="purple" link="blue">
<p class="MsoNormal">All,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I'm modeling a building and for some reason I can't get the heat to turn on. The building is a VRF system - we are tricking a heat pump system into a VRF system per BSUG directions (attached).</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I've attached the model file. Can someone take a look and see what I did wrong?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">-Terry</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b><span style="COLOR: #1f497d; FONT-SIZE: 13.5pt">Terrence W. Budd, P.E., CPD, LEED AP</span></b></p>
<p class="MsoNormal"><b> </b></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 10pt">Lee S. Good Engineering</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 10pt">10483 Cleveland Ave NW</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 10pt">Uniontown, Ohio 44685</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 8pt">Phone: 330.494.1574 Fax:330.494.1567</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: Webdings; COLOR: #008040; FONT-SIZE: 13.5pt">ü</span><span style="COLOR: black"> </span><span style="COLOR: green; FONT-SIZE: 7.5pt" lang="EN-GB">Please consider the environment before printing this e-mail.</span><span style="COLOR: #4f6228"></span></p>
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