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<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Hello
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I have been working on a GSHP model in a northeast
climate that is sized for cooling and has an auxiliary boiler system to handle
remaining heating load for the building. The main air system is VAV Fan Powered
Boxes, but the errors are occurring only on the systems that happen to be
constant volume. For whatever reason I am getting a bunch of warnings about the
heating coils not having sufficient capacity, or rather the system does not
have sufficient capacity to handle the heating loads. I have left everything
auto-sized and used the appropriate equipment controls to have the boiler pick
up the remaining load but there must be an error in my methods. I am getting capacity
out of the boiler in the hourly reports so it makes me think that my problems
are related to the air side system sizing or controls, but to be honest I am
not sure here is the Warning:<o:p></o:p></span></font></p>
<p class=Normal><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
PREHEAT/HEATING-CAPACITY in SYSTEM Process AHU
Lower
<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
is too low to provide the requested supply temperature for<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
the calculated mixed air temperature using total ZONE loads<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
(on LS-A/B) and SYSTEM design parameters, plus outside air<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
conditions (on LS-C), and specified capacities & air flows.<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
Requested temperature is 55.00 calculated is 3.24<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
Check HEATING-CAPACITY, HEAT-SET-T, PRE-HEAT-T, MAX-SUPPLY-T,<o:p></o:p></span></font></i></p>
<p class=Normal><i><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New";font-style:italic'>
DESIGN-HEAT-T, and ZONE loads for consistency.<o:p></o:p></span></font></i></p>
<p class=Normal><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=Normal><font size=1 face="Courier New"><span style='font-size:8.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>This is a snippet of the INP file.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>"Heating Hot Water <st1:place
w:st="on">Loop</st1:place>" = CIRCULATION-LOOP<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
TYPE =
HW<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
LOOP-DESIGN-DT = 10<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
DESIGN-HEAT-T = 130<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
LOOP-PUMP =
"DEFAULT-HW-PUMP"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HEAT-EQUIP-CTRL = "Heat Pump HW Control"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>"Aux Boiler" =
BOILER <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
TYPE =
HW-CONDENSING<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
CAPACITY-RATIO = 1.2<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HW-LOOP = "Heating
Hot Water <st1:place w:st="on">Loop</st1:place>"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HW-PUMP = "Boiler
Pump"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HW-FLOW-CTRL = VARIABLE-FLOW<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>"Process AHU Lower" =
SYSTEM <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
TYPE =
VAVS<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HEAT-SOURCE = HOT-WATER<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> BASEBOARD-SOURCE =
HOT-WATER<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
MAX-SUPPLY-T = 70<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
MIN-OA-METHOD = DCV-RETURN-SENSOR<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
MIN-OUTSIDE-AIR = 0.1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
RECOVER-EXHAUST = YES<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> FAN-CONTROL
= CONSTANT-VOLUME<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> NIGHT-CYCLE-CTRL =
CYCLE-ON-ANY<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
REHEAT-DELTA-T = 15<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HW-LOOP = "Heating
Hot Water <st1:place w:st="on">Loop</st1:place>"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
CHW-LOOP = "Chilled Water <st1:place
w:st="on">Loop</st1:place>"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> ERV-RECOVER-TYPE =
ENTHALPY-WHEEL<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>"EL2 <st1:place w:st="on">West
Perim</st1:place> Zn (G.W1)" =
ZONE <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
TYPE =
CONDITIONED<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
FLOW/AREA = 1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
HEAT-TEMP-SCH = "Process Heat Sch"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
DESIGN-COOL-T = 85<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
COOL-TEMP-SCH = "Process Cool Sch"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
SIZING-OPTION = ADJUST-LOADS<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
SPACE =
"EL2 <st1:place w:st="on">West Perim</st1:place> Spc (G.W1)"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
OA-FLOW/AREA = 1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>"Heat Pump CHW
Control" = EQUIP-CTRL <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
TYPE =
COOLING<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> CIRCULATION-LOOP =
"Chilled Water <st1:place w:st="on">Loop</st1:place>"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
CHILLERS-1 = ( "GSHP-1",
"GSHP-2", "GSHP-3" )<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
CHILLERS-SEQ-1 = ( 1, 2, 3 )<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> ..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>"Heat Pump HW Control"
= EQUIP-CTRL <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
TYPE =
HEATING<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'> CIRCULATION-LOOP =
"Heating Hot Water <st1:place w:st="on">Loop</st1:place>"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
LOADS-THRU-1 = 999<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
BOILERS-1 = ( "Aux Boiler"
)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
CHLR/HTRS-1 = ( "GSHP-1",
"GSHP-2", "GSHP-3" )<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=CourierPS><span lang=EN-GB
style='font-size:10.0pt;font-family:CourierPS'>
CHLR/HTRS-SEQ-1 = ( 1, 2, 3 )<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Thanks in advance for any help.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><st1:PersonName w:st="on"><b><font size=1 face=Arial><span
lang=EN-GB style='font-size:8.0pt;font-family:Arial;font-weight:bold'>Alan
Jackson</span></font></b></st1:PersonName><b><font size=1 face=Arial><span
lang=EN-GB style='font-size:8.0pt;font-family:Arial;font-weight:bold'>,
LEED® A.P. <o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>Senior Mechanical Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>Buro Happold Consulting Engineers, PC<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>100 Broadway <o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:Arial'>New
York</span></font></st1:City><font size=1 face=Arial><span lang=EN-GB
style='font-size:8.0pt;font-family:Arial'>, <st1:State w:st="on">NY</st1:State>
<st1:PostalCode w:st="on">10005</st1:PostalCode></span></font></st1:place><font
size=1 face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:country-region w:st="on"><st1:place w:st="on"><font
size=1 face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:Arial'>USA</span></font></st1:place></st1:country-region><font
size=1 face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>Tel: (+1) 212 334 2025<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>Direct: (+1) 212 616 0267<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>Fax: (+1) 212 334 5528<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'>Email: <a
href="mailto:alan.jackson@burohappold.com"
title="mailto:alan.jackson@burohappold.com">alan.jackson@burohappold.com</a><br>
<a href="http://www.burohappold.com/" title="http://www.burohappold.com/">www.burohappold.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
8.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=gray face=Arial><span lang=EN-GB
style='font-size:8.0pt;font-family:Arial;color:gray'>This transmission is
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