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Nick,<br>
<br>
DOE-2 enforces a mass balance at the system level. Whatever OA that is
not exhausted at the zone level must be returned to the central system
and exhausted through your heat recovery device. By defining the OA
volume flow rate, you are also defining the exhaust volume flow rate.<br>
<br>
Nick Caton wrote:
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<p class="MsoNormal">I need have an ERV which moves all the exhaust
and supplies
conditioned OA to 2 of 3 FPVAV air handlers. I’ve specified the
appropriate enthalpy wheel specifics at the two affected PIU systems,
maintaining
identical efficiency properties and breaking down CFM’s and
fan/auxiliary
power figures by weighting each by the supplied OA amount.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I understand from the help files that
zonally-specified
exhaust air does not play into heat-recovery, when we specify energy
recovery
at the system level (help section is copied below and highlighted for
reference).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I take it then I’m supposed to zero out all
zonally
entered exhaust air flows, sum up the flows and add at the system
level…
but then <u>how/where do I specify system-level exhaust CFM rates</u>?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve tried to enter EXHAUST-FLOW
= #### under the systems in question in the .inp file, but it
introduces the
following error: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">*13131*
EXHAUST-FLOW = 2550<o:p></o:p></p>
<p class="MsoNormal">*ERROR********* ============
*****************************************************************UNKNOWN
KEYWORD or PREVIOUS .. MISSING <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">More errors ensue, and a long string of things
appear to be
defaulted/lost when I continue to open the file… something is obviously
wrong with this approach.<b><span
style="font-family: "Stylus BT","sans-serif"; color: rgb(45, 77, 94);"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-family: "Stylus BT","sans-serif"; color: rgb(45, 77, 94);"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><img id="Picture_x0020_1"
src="cid:part1.04060702.05010406@greensim.com"
alt="cid:489575314@22072009-0ABB" height="37" width="119"><b><span
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<p class="MsoNormal"><b><span
style="font-family: "Stylus BT","sans-serif"; color: rgb(45, 77, 94);"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-family: "Stylus BT","sans-serif"; color: rgb(45, 77, 94);">NICK
CATON, E.I.T.</span></b><b><span
style="font-size: 12pt; font-family: "Stylus BT","sans-serif"; color: rgb(45, 77, 94);"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style=""><b><span
style="font-size: 10pt; font-family: "Times New Roman","serif";">EXHAUST-FLOW<o:p></o:p></span></b></p>
<p class="MsoNormal" style=""><span
style="font-size: 12pt; font-family: "Times New Roman","serif";">Flow
rate of the
zone's exhaust fan. This entry can be omitted if there is no exhaust
from the
zone, if there is only central exhaust by way of the system return, or
if the
exhaust tracks the supply flow (see AIRFLOW-TRACKING). If specified,
EXHAUST-STATIC should also be entered. The exhaust fan may be either
constant
flow or variable flow. <o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 12pt; font-family: "Times New Roman","serif";">If
exhaust air
make-up is via the air handler (EXHAUST-SOURCE = AIR-HANDLER), then the
exhaust
fan can operate only only when the system supply and return fans
operate (see
SYSTEM:FAN-SCHEDULE or SYSTEM:EXHAUST-FAN-SCH).<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 12pt; font-family: "Times New Roman","serif"; color: red;">The
SYSTEMS program simulates heat recovery from central exhaust only, not
from
zone exhaust. If heat is to be recovered, zone exhaust should not be
entered
but rather allowed to default to the central system. Return fan static
should
be adjusted, on a weighted average basis, to reflect zone exhaust fan
conditions. <o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 12pt; font-family: "Times New Roman","serif";">The
program will
not allow SYSTEM:MIN-OUTSIDE-AIR to be less than the sum of
EXHAUST-FLOWs for
all zones divided by the sum of supply flows for all zones. That is,
MIN-OUTSIDE-AIR will not restrict the operation of exhaust fans. The
exception
is when EXHAUST-SOURCE = INFILTRATION, in which case zonal exhaust does
not
affect air handler outside air requirements.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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