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<p class=MsoNormal>I’m trying to figure out an interesting result for
heating energy for a building I’m modeling.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>5-story, 400,000 sq ft office, shutoff VAV boxes fed from
chilled water AHUs and a hot water loop fed from gas-fired boilers.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Here is a copy of the SS-J report for one of the (5) AHUs
serving the space. What I don’t understand is why there is a HUGE
delta in the hourly heating load after-hours. All of the
“even” hours from midnight until about noon have high heating
loads, and all the “odd” hours have low heating loads (I’ve
highlighted these below).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>What’s going on? I know there is a “demand
window” for a utility rate, but this seems to be a different issue.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>OK – I think I found out why this is happening.
Under the “Simulation Options” in the PROJECT & SITE tab, there
are options for the hourly reports. <o:p></o:p></p>
<p class=MsoNormal>However, it seems like none of the loads, system, plant or
economics reports can be processed at a frequency exceeding hourly.<o:p></o:p></p>
<p class=MsoNormal>But what this means is that I can’t pull an accurate
peak building load if it keeps bouncing between too high and too low of a
reported load.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is there any way around this? I looked into creating
design day schedules, and that seems to have worked, but it doesn’t
change anything under the SS-D report (Significantly). <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Where do you review the Building HVAC Load Summary for the
design days? Is there a separate report that I just can’t find?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Also, regardless of what shows up for the design day, doesn’t
this large fluctuation in the hourly heating values negatively impact the
accuracy of the model?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks in advance,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'>,
PE, LEED AP<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Senior Associate</span></b><b><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span
style='color:black'>1010 N. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span
style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span
style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span
style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-338-5754 (Cell)</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-243-1200 (Office)</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-276-1376 (Fax)</span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><a href="http://www.ghtltd.com/"><span style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:blue'>www.ghtltd.com</span></a><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><br>
**** -
Proposed
DOE-2.2-44d5
12/16/2008 18:25:54 BDL RUN 3<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>REPORT-
SS-J Peak Heating and Cooling for EL1 Sys1 (VAVS) (G) WEATHER
FILE- WASHINGTON, DC <o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>---------------------------------------------------------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
- - - - - C O O L I N G - - - - - - - - H E
A T I N G - - - D A Y C O O L I
N G P E A K<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
AUG
16
JAN
15
JUL 9<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
HOURLY
HOURLY
HOURLY<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
COOLING SENSIBLE DRY-
WET- HEATING
DRY- WET-
COOLING SENSIBLE DRY- WET-<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
LOAD HEAT
BULB
BULB
LOAD BULB
BULB
LOAD HEAT
BULB BULB<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>HOUR
(KBTU) RATIO TEMP
TEMP (KBTU)
TEMP TEMP
(KBTU) RATIO
TEMP TEMP<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
1 290.433
0.446 74.F
70.F </span><b><span style='font-size:10.0pt;
font-family:"Courier New"'>-632.664</span></b><span style='font-size:8.0pt;
font-family:"Courier New"'> 10.F
9.F
224.550 0.407
74.F 72.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
2 262.461
0.454 73.F 69.F </span><b><span
style='font-size:10.0pt;font-family:"Courier New"'>-2019.841</span></b><span
style='font-size:8.0pt;font-family:"Courier New"'>
9.F 8.F
204.537 0.412
73.F 71.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
3 254.020
0.454 73.F
69.F </span><b><span style='font-size:10.0pt;
font-family:"Courier New"'>-725.447</span></b><span style='font-size:8.0pt;
font-family:"Courier New"'> 8.F
7.F
193.290 0.399
72.F 71.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
4 254.247
0.461 72.F 68.F </span><b><span
style='font-size:10.0pt;font-family:"Courier New"'>-2035.241</span></b><span
style='font-size:8.0pt;font-family:"Courier New"'>
7.F 6.F 198.909
0.402 71.F 70.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
5 526.613
0.454 73.F
69.F </span><b><span style='font-size:10.0pt;
font-family:"Courier New"'>-805.752</span></b><span style='font-size:8.0pt;
font-family:"Courier New"'> 7.F
7.F
506.639 0.394
73.F 72.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
6 1954.301
0.777 73.F 69.F </span><b><span
style='font-size:10.0pt;font-family:"Courier New"'>-4975.409</span></b><span
style='font-size:8.0pt;font-family:"Courier New"'>
7.F 7.F
2092.500 0.711 74.F
73.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
7 2528.958
0.741 74.F
70.F </span><b><span style='font-size:10.0pt;
font-family:"Courier New"'>-927.359</span></b><span style='font-size:8.0pt;
font-family:"Courier New"'> 7.F
6.F
2711.656 0.698
76.F 74.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
8 2542.338
0.740 76.F 71.F </span><b><span
style='font-size:10.0pt;font-family:"Courier New"'>-4975.296</span></b><span
style='font-size:8.0pt;font-family:"Courier New"'>
9.F 8.F
2748.939 0.704
80.F 75.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
9 2644.668
0.744 79.F
72.F </span><b><span style='font-size:10.0pt;
font-family:"Courier New"'>-738.268</span></b><span style='font-size:8.0pt;
font-family:"Courier New"'> 11.F
10.F
2841.915 0.707
83.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
10 2792.738
0.726 81.F 74.F </span><b><span
style='font-size:10.0pt;font-family:"Courier New"'>-4927.778</span></b><span
style='font-size:8.0pt;font-family:"Courier New"'>
13.F 12.F
2925.798 0.711
87.F 77.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
11 2793.809
0.754 86.F
74.F </span><b><span style='font-size:10.0pt;
font-family:"Courier New"'>-486.871</span></b><span style='font-size:8.0pt;
font-family:"Courier New"'> 16.F
14.F
2913.226 0.717
88.F 77.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
12 2856.012
0.770 92.F 75.F </span><b><span
style='font-size:10.0pt;font-family:"Courier New"'>-1161.596</span></b><span
style='font-size:8.0pt;font-family:"Courier New"'>
19.F 17.F
2923.506 0.728
90.F 77.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
13 2869.460
0.797 97.F
75.F -402.573
22.F 19.F
2936.946 0.733
91.F 77.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
14 2940.005
0.785 97.F
76.F -692.877
22.F 19.F 2876.902
0.751 91.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
15 2972.225
0.782 96.F
76.F -797.705
22.F 19.F 2890.462
0.753 91.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
16 3047.949
0.767 96.F
77.F -816.324
22.F 19.F 2912.354
0.751 91.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
17 2971.663
0.765 93.F
76.F -995.525
21.F 19.F 2927.038
0.747 90.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
18 2190.738
0.677 89.F
77.F -731.953
20.F 18.F 2144.074
0.688 88.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
19 72.359
0.473 86.F 76.F
-1410.968 19.F
17.F
72.887 0.483
87.F 76.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
20 445.845
0.470 84.F
75.F -625.920
18.F 16.F
387.226 0.459
83.F 75.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
21 558.937
0.455 81.F 74.F
-1929.490 17.F
15.F 489.783
0.431 79.F 74.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
22 446.512
0.451 79.F 73.F
-642.555 16.F
14.F
352.304 0.419
75.F 72.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
23 401.832
0.439 78.F 73.F
-2073.865 17.F
15.F 312.851
0.407 74.F 72.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
24 362.264
0.446 77.F
72.F -653.700 17.F
15.F
285.874 0.426
74.F 71.F<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
--------
--------
---------<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>SUM
39074.168<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>MAX
3047.949 -4975.409<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
SYSTEM-TYPE
VAVS
SQFT/TON
698.0<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
COOLING PEAK 17.19
(BTU/HR- SQFT) HEATING
PEAK -28.06 (BTU/HR- SQFT)<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
SUPPLY AIR PEAK FLOW 0.46
(CFM/SQFT)
MIN-OA/PERSON 20.00 (CFM )<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
OA FRAC AT CLG PEAK
0.191
OA FRAC AT HTG PEAK 0.997<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New"'>
* ASTERISKS INDICATE HOURS LOADS NOT MET<br clear=all style='page-break-before:
always'>
<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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