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Thu May 8 09:17:00 PDT 2014


thermal efficiency can be used to isolate the small jacket losses for a
given boiler. However this doesn't translate directly into DOE2.2.
STANDBY-TIME is used to account for these losses.=20

=20

When setting up a boiler in DOE-2 or eQuest, what are realistic values
you users have applied for STANDBY-TIME?

=20

The DOE2.2 manual volume 2 defines STANDBY-TIME as "The number of hours
of equivalent full-load time required to maintain a boiler at
temperature, when the heating load is zero.  When operating below the
MIN-RATIO, the boiler is assumed to be cycling.  When cycled on, the
boiler will operate at the MIN-RATIO.  When off, losses and energy are
determined using this keyword.  The program interpolates between energy
consumed at the MIN-RATIO, and energy in full standby mode; based on the
fraction of the time the boiler is cycled on."=20

=20

Is the DOE-2 default of 0.016 hours realistic?

=20

S.P. Henry

Interface Engineering=20

Portland OR

=20



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<p class=3DMsoPlainText><font size=3D2 face=3D"Courier New"><span =
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10.0pt'>Dear BLDG-SIM users:<o:p></o:p></span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3D"Courier New"><span =
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10.0pt'>In modeling boilers, standby losses obviously need to be =
accounted for.


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