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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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<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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