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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Siddharth<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>When I had issues with unmet load hours recently, it turned out
to be the temperature control setpoints. I produced an hourly report with air
temperatures at various parts of the air handling system, and was able to see that
the control for the supply temperature was causing the problem.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I hope this helps.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>MaryAnne <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Siddharth
V<br>
<b>Sent:</b> Friday, September 17, 2010 7:29 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Cooling Load not met!<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi All, </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>I have created a
System, which has only one zone(25000 sqft) using DX coils for cooling, Furnace
for heating; and system type is CAV Packaged Single Zone system. </span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I have set the </span><span
style='font-size:10.0pt;font-family:"Courier New"'>COOLING-CAPACITY = 1500.00
kBTU/hr. </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>When I was going
through the HOURLY reports, I found the following data.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>Below are the Peak
Cooling Report Summary, followed by the HVAC Cooling load for the peak day(Jun
21) and the current zone temperatures/ Thermostat Temperatures for that same
day. </span><br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>MY Queries are: </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>If my HVAC system is
designed to remove a heat load of 1500kBTU, and the total Heat to be removed on
<b>Jun21 (8am)</b> was <b>1004375+44188 = 1048563 BTU/hr </b>only, why wasnt
the HVAC system unable to remove it? The first doubt was about insufficient CFM
(of the used constant volume system). But the same CFM is able to handle higher
loads at other times.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>Please see the SS-J
Report during the particular hour the load was never met. </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>Please resolve my
confusion regarding this sufficient cooling capacity vs unmet load scenarios.</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>I am attaching the
inp, weather file for your reference (in case it helps).</span> <br>
<br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>REPORTS:</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
</span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>REPORT- SS-J Peak
Heating and Cooling for Sys1 (PSZ) (G.1)
WEATHER FILE- EPW New Delhi,Delhi,</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>---------------------------------------------------------------------------------------------------------------------------------</span>
<br>
<br>
<br>
<br>
<span style='font-size:10.0pt;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</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
JUN 14
JAN 19
JUN 21</span> <br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
HOURLY
HOURLY
HOURLY</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
COOLING SENSIBLE DRY- WET-
HEATING DRY- WET-
COOLING SENSIBLE DRY- WET-</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
LOAD HEAT BULB
BULB LOAD BULB
BULB LOAD HEAT
BULB BULB</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>HOUR
(KBTU) RATIO TEMP TEMP
(KBTU) TEMP TEMP
(KBTU) RATIO TEMP TEMP</span> <br>
<br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 1
0.000 0.000 93.F 74.F
0.000 49.F 48.F
0.000 0.000 89.F
79.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 2
0.000 0.000 95.F 74.F
0.000 48.F 47.F
0.000 0.000 89.F
78.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 3
0.000 0.000 96.F 73.F
0.000 47.F 47.F
0.000 0.000 87.F
78.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 4
0.000 0.000 95.F 74.F
0.000 47.F 47.F
0.000 0.000 86.F
78.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 5
0.000 0.000 89.F 76.F
0.000 47.F 47.F
0.000 0.000 85.F
79.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 6
0.000 0.000 89.F 77.F
0.000 48.F 47.F
0.000 0.000 84.F
80.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 7
1100.896 0.763 89.F 77.F
0.000 48.F 48.F
1065.103 0.708 85.F 80.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 8
988.670 * 0.732 90.F 78.F
0.000 49.F 48.F
<b>1004.375 * 0.685 86.F 80.F</b></span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 9
996.547 0.747 92.F 78.F
0.000 51.F 50.F
988.282 0.686 90.F 81.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 10
982.636 * 0.731 94.F 79.F
0.000 52.F 51.F
1006.017 0.678 92.F 81.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 11
987.969 0.734 97.F 79.F
0.000 54.F 52.F
988.014 0.678 95.F 82.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 12
998.494 0.711 99.F 81.F
0.000 55.F 54.F
989.553 0.669 97.F 83.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 13
1004.154 0.694 100.F 82.F
0.000 57.F 54.F
990.271 0.662 98.F 84.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 14
979.070 0.691 100.F 83.F
0.000 59.F 55.F
955.878 0.668 99.F 83.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 15
934.561 0.711 100.F 81.F
0.000 59.F 55.F
942.959 0.676 101.F 83.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 16
863.300 0.735 100.F 78.F
0.000 59.F 55.F
899.941 0.683 101.F 82.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 17
737.102 0.770 99.F 75.F
0.000 58.F 55.F
814.377 0.687 102.F 82.F</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 18
0.000 0.000 97.F 75.F
-6.497 56.F 53.F
0.000 0.000 101.F 81.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 19
0.000 0.000 96.F 74.F
0.000 53.F 52.F
0.000 0.000 100.F
81.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 20
0.000 0.000 94.F 76.F
0.000 51.F 50.F
0.000 0.000 98.F
81.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 21
0.000 0.000 93.F 77.F
0.000 49.F 49.F
0.000 0.000 98.F
82.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 22
0.000 0.000 91.F 78.F
0.000 48.F 48.F
0.000 0.000 96.F
81.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 23
0.000 0.000 90.F 78.F
0.000 48.F 48.F
0.000 0.000 95.F
81.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 24
0.000 0.000 89.F 78.F
0.000 49.F 48.F
0.000 0.000 93.F
81.F</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
--------
--------
---------</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>SUM
10644.770</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>MAX
1100.896
-6.497</span> <br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
SYSTEM-TYPE PSZ
SQFT/TON
544.9</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
COOLING PEAK
22.02 (BTU/HR- SQFT) HEATING PEAK
-0.13 (BTU/HR- SQFT)</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
SUPPLY AIR PEAK FLOW 0.53 (CFM/SQFT)
MIN-OA/PERSON 35.00 (CFM )</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
OA FRAC AT CLG PEAK 0.164
OA FRAC AT HTG PEAK
0.164</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
* ASTERISKS INDICATE HOURS LOADS NOT MET</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>---------------------------------------------------------------------------------------------------------------------------------------------------</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
BUILDING Zn (G.1)</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
-HVAC </span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
COOLING LOAD NOT</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
LOAD MET </span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
BTU/HR BTU/HR </span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
</span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
----( 1) ----(16)</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 621 7
1065103. 0.</span> <br>
<b><span style='font-size:10.0pt;font-family:"Courier New"'> 621 8
1004375. 44188.</span></b> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 621 9
988282. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62110
1006017. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62111
988014. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62112
989553. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62113
990271. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62114
955878. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62115
942959. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62116
899941. 0.</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62117
814377. 0.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> DAILY SUMMARY
(JUN 21)</span> <br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>-------------------------------------------------------------------------------------------------------------------------------------------------</span>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
Zn (G.1) Zn (G.1)</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
</span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
ZONE THERMOST</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
TEMP SETPOINT</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
F F </span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
</span><br>
<span style='font-size:10.0pt;font-family:"Courier New"'>
----( 6) ----( 7)</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 621 7
76.9 76.0</span> <br>
<b><span style='font-size:10.0pt;font-family:"Courier New"'> 621 8
79.4 76.0</span></b> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 621 9
76.9 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62110
77.0 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62111
76.9 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62112
76.9 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62113
76.9 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62114
76.8 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62115
76.8 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62116
76.7 76.0</span> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'> 62117
76.6 76.0</span> <br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Courier New"'> DAILY SUMMARY
(JUN 21)</span> <br>
<br>
<br>
<br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards,<br>
Siddharth Venkataraman<br>
Tata Consultancy Services<br>
Mailto: siddharth.v@tcs.com<br>
Website: </span><a href="http://www.tcs.com/"><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>http://www.tcs.com</span></a><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
____________________________________________<br>
Experience certainty. IT Services<br>
Business Solutions<br>
Outsourcing<br>
____________________________________________</span><o:p></o:p></p>
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