<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>Siddharth:<br><br>It would help if you attach the .pd2 file also.<br><br>Paul Diglio<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Siddharth V <siddharth.v@tcs.com><br><b><span style="font-weight: bold;">To:</span></b> equest-users@lists.onebuilding.org<br><b><span style="font-weight: bold;">Sent:</span></b> Fri, September 17, 2010 6:29:11 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [Equest-users] Cooling Load not met!<br></font><br>
<br><font face="sans-serif" size="2">Hi All, </font>
<br>
<br><font face="Courier New" size="2">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. </font>
<br>
<br><font face="sans-serif" size="2">I have set the </font><font face="Courier New" size="2">COOLING-CAPACITY
= 1500.00 kBTU/hr. </font>
<br>
<br><font face="Courier New" size="2">When I was going through the HOURLY
reports, I found the following data.</font>
<br>
<br><font face="Courier New" size="2">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. </font>
<br>
<br>
<br><font face="Courier New" size="2">MY Queries are: </font>
<br>
<br><font face="Courier New" size="2">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.</font>
<br>
<br><font face="Courier New" size="2">Please see the SS-J Report during the
particular hour the load was never met. </font>
<br>
<br><font face="Courier New" size="2">Please resolve my confusion regarding
this sufficient cooling capacity vs unmet load scenarios.</font>
<br>
<br><font face="Courier New" size="2">I am attaching the inp, weather file
for your reference (in case it helps).</font>
<br>
<br>
<br>
<br><font face="Courier New" size="2">REPORTS:</font>
<br><font face="Courier New" size="2">
</font>
<br><font face="Courier New" size="2">REPORT- SS-J Peak Heating and Cooling
for Sys1 (PSZ) (G.1)
WEATHER FILE-
EPW New Delhi,Delhi,</font>
<br><font face="Courier New" size="2">---------------------------------------------------------------------------------------------------------------------------------</font>
<br>
<br>
<br>
<br><font face="Courier New" size="2">
- - - - - 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</font>
<br>
<br><font face="Courier New" size="2">
JUN 14
JAN 19
JUN 21</font>
<br>
<br>
<br><font face="Courier New" size="2">
HOURLY
HOURLY
HOURLY</font>
<br><font face="Courier New" size="2"> COOLING
SENSIBLE DRY- WET-
HEATING DRY- WET- COOLING
SENSIBLE DRY- WET-</font>
<br><font face="Courier New" size="2">
LOAD HEAT BULB BULB
LOAD BULB BULB
LOAD HEAT
BULB BULB</font>
<br><font face="Courier New" size="2">HOUR (KBTU)
RATIO TEMP TEMP
(KBTU) TEMP TEMP
(KBTU) RATIO TEMP TEMP</font>
<br>
<br>
<br>
<br><font face="Courier New" size="2"> 1
0.000 0.000 93.F 74.F
0.000 49.F 48.F
0.000 0.000 89.F
79.F</font>
<br><font face="Courier New" size="2"> 2
0.000 0.000 95.F 74.F
0.000 48.F 47.F
0.000 0.000 89.F
78.F</font>
<br><font face="Courier New" size="2"> 3
0.000 0.000 96.F 73.F
0.000 47.F 47.F
0.000 0.000 87.F
78.F</font>
<br><font face="Courier New" size="2"> 4
0.000 0.000 95.F 74.F
0.000 47.F 47.F
0.000 0.000 86.F
78.F</font>
<br><font face="Courier New" size="2"> 5
0.000 0.000 89.F 76.F
0.000 47.F 47.F
0.000 0.000 85.F
79.F</font>
<br><font face="Courier New" size="2"> 6
0.000 0.000 89.F 77.F
0.000 48.F 47.F
0.000 0.000 84.F
80.F</font>
<br><font face="Courier New" size="2"> 7 1100.896
0.763 89.F 77.F
0.000 48.F 48.F
1065.103 0.708 85.F 80.F</font>
<br><font face="Courier New" size="2"> 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></font>
<br><font face="Courier New" size="2"> 9 996.547
0.747 92.F 78.F
0.000 51.F 50.F
988.282 0.686 90.F 81.F</font>
<br><font face="Courier New" size="2"> 10 982.636 *
0.731 94.F 79.F
0.000 52.F 51.F 1006.017
0.678 92.F 81.F</font>
<br><font face="Courier New" size="2"> 11 987.969
0.734 97.F 79.F
0.000 54.F 52.F 988.014
0.678 95.F 82.F</font>
<br><font face="Courier New" size="2"> 12 998.494
0.711 99.F 81.F
0.000 55.F 54.F 989.553
0.669 97.F 83.F</font>
<br><font face="Courier New" size="2"> 13 1004.154
0.694 100.F 82.F
0.000 57.F 54.F 990.271
0.662 98.F 84.F</font>
<br><font face="Courier New" size="2"> 14 979.070
0.691 100.F 83.F
0.000 59.F 55.F 955.878
0.668 99.F 83.F</font>
<br><font face="Courier New" size="2"> 15 934.561
0.711 100.F 81.F
0.000 59.F 55.F 942.959
0.676 101.F 83.F</font>
<br><font face="Courier New" size="2"> 16 863.300
0.735 100.F 78.F
0.000 59.F 55.F 899.941
0.683 101.F 82.F</font>
<br><font face="Courier New" size="2"> 17 737.102
0.770 99.F 75.F
0.000 58.F 55.F 814.377
0.687 102.F 82.F</font>
<br><font face="Courier New" size="2"> 18 0.000
0.000 97.F 75.F
-6.497 56.F 53.F
0.000 0.000 101.F 81.F</font>
<br><font face="Courier New" size="2"> 19 0.000
0.000 96.F 74.F
0.000 53.F 52.F
0.000 0.000 100.F 81.F</font>
<br><font face="Courier New" size="2"> 20 0.000
0.000 94.F 76.F
0.000 51.F 50.F
0.000 0.000 98.F
81.F</font>
<br><font face="Courier New" size="2"> 21 0.000
0.000 93.F 77.F
0.000 49.F 49.F
0.000 0.000 98.F
82.F</font>
<br><font face="Courier New" size="2"> 22 0.000
0.000 91.F 78.F
0.000 48.F 48.F
0.000 0.000 96.F
81.F</font>
<br><font face="Courier New" size="2"> 23 0.000
0.000 90.F 78.F
0.000 48.F 48.F
0.000 0.000 95.F
81.F</font>
<br><font face="Courier New" size="2"> 24 0.000
0.000 89.F 78.F
0.000 49.F 48.F
0.000 0.000 93.F
81.F</font>
<br><font face="Courier New" size="2"> --------
--------
---------</font>
<br><font face="Courier New" size="2">SUM
10644.770</font>
<br><font face="Courier New" size="2">MAX 1100.896
-6.497</font>
<br>
<br>
<br><font face="Courier New" size="2">
SYSTEM-TYPE PSZ
SQFT/TON
544.9</font>
<br><font face="Courier New" size="2">
COOLING PEAK 22.02 (BTU/HR-
SQFT) HEATING PEAK -0.13 (BTU/HR-
SQFT)</font>
<br><font face="Courier New" size="2">
SUPPLY AIR PEAK FLOW 0.53 (CFM/SQFT)
MIN-OA/PERSON 35.00 (CFM )</font>
<br><font face="Courier New" size="2">
OA FRAC AT CLG PEAK 0.164
OA FRAC AT HTG PEAK 0.164</font>
<br>
<br><font face="Courier New" size="2">
* ASTERISKS INDICATE HOURS LOADS NOT MET</font>
<br><font face="Courier New" size="2">---------------------------------------------------------------------------------------------------------------------------------------------------</font>
<br>
<br><font face="Courier New" size="2">
BUILDING Zn (G.1)</font>
<br><font face="Courier New" size="2">
-HVAC </font>
<br><font face="Courier New" size="2">
COOLING LOAD NOT</font>
<br><font face="Courier New" size="2">
LOAD MET </font>
<br><font face="Courier New" size="2">
BTU/HR BTU/HR </font>
<br><font face="Courier New" size="2">
</font>
<br><font face="Courier New" size="2">
----( 1) ----(16)</font>
<br><font face="Courier New" size="2"> 621 7 1065103.
0.</font>
<br><font face="Courier New" size="2"><b> 621 8 1004375.
44188.</b></font>
<br><font face="Courier New" size="2"> 621 9 988282.
0.</font>
<br><font face="Courier New" size="2"> 62110 1006017.
0.</font>
<br><font face="Courier New" size="2"> 62111 988014.
0.</font>
<br><font face="Courier New" size="2"> 62112 989553.
0.</font>
<br><font face="Courier New" size="2"> 62113 990271.
0.</font>
<br><font face="Courier New" size="2"> 62114 955878.
0.</font>
<br><font face="Courier New" size="2"> 62115 942959.
0.</font>
<br><font face="Courier New" size="2"> 62116 899941.
0.</font>
<br><font face="Courier New" size="2"> 62117 814377.
0.</font>
<br>
<br><font face="Courier New" size="2"> DAILY SUMMARY (JUN 21)</font>
<br>
<br>
<br><font face="Courier New" size="2">-------------------------------------------------------------------------------------------------------------------------------------------------</font>
<br><font face="Courier New" size="2"> Zn (G.1)
Zn (G.1)</font>
<br><font face="Courier New" size="2">
</font>
<br><font face="Courier New" size="2"> ZONE
THERMOST</font>
<br><font face="Courier New" size="2"> TEMP
SETPOINT</font>
<br><font face="Courier New" size="2"> F
F </font>
<br><font face="Courier New" size="2">
</font>
<br><font face="Courier New" size="2"> ----( 6)
----( 7)</font>
<br><font face="Courier New" size="2"> 621 7 76.9
76.0</font>
<br><font face="Courier New" size="2"><b> 621 8 79.4
76.0</b></font>
<br><font face="Courier New" size="2"> 621 9 76.9
76.0</font>
<br><font face="Courier New" size="2"> 62110 77.0
76.0</font>
<br><font face="Courier New" size="2"> 62111 76.9
76.0</font>
<br><font face="Courier New" size="2"> 62112 76.9
76.0</font>
<br><font face="Courier New" size="2"> 62113 76.9
76.0</font>
<br><font face="Courier New" size="2"> 62114 76.8
76.0</font>
<br><font face="Courier New" size="2"> 62115 76.8
76.0</font>
<br><font face="Courier New" size="2"> 62116 76.7
76.0</font>
<br><font face="Courier New" size="2"> 62117 76.6
76.0</font>
<br>
<br>
<br><font face="Courier New" size="2"> DAILY SUMMARY (JUN 21)</font>
<br>
<br>
<br>
<br>
<br>
<br><font face="sans-serif" size="2">Regards,<br>
Siddharth Venkataraman<br>
Tata Consultancy Services<br>
Mailto: siddharth.v@tcs.com<br>
Website: </font><a rel="nofollow" target="_blank" href="http://www.tcs.com"><font face="sans-serif" size="2">http://www.tcs.com</font></a><font face="sans-serif" size="2"><br>
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