This is getting a bit "Star Trek". eQuest does its 8,760 hour simulation based
on input provided by both the user and the weather file. What you seem to be
seeking is REAL TIME information, avalable only through multple sensor inputs.
For that skin load parameter, you might use eQuest to generate the building skin
loss baseed on outdoor temperature, place these numbers in a spreadsheet, thern
have an outdoor air temperature sensor pick the number based on the delta T
(indoor to outdoor).
You could?use eQuest to generate your range, based on whatever is the driving
parameter is, then have a number come from a programmed calculation to display
"Real Time" output.
You can always ask Chief Engineering Officer Montgomery Scott. Scotty can fix
anything..
A little bit late in the response, but have another suggestion to
"measure" your building skin heat loss with the BMS.. Since your
heating system is designed to provide the heat the building is losing,
you could just use the total heating load in the building and subtract
any ventilation heating and local reheat (if a VAV system). If it's a
complex system then this would be difficult, but if it's all VAV boxes
it would be a single calculation for each VAV box with reheat and then a
summation for the total.
By the way, many thanks to all the contributors and organizers of this
energy modeling resource - it is fantastic!
1) I have received several of these warning messages (20+) and they refer
to a specific hour and occur over winter and late fall in hot, humid
Georgia. It occurs when a standard VAV system with chilled water cooling
with electric re-heat is modeled including (and not including) a pre-heater.
It only occurs in one, sometimes two, shells but when I delete that shell,
the warnings pop up in another shell. I am usually able to detective my way
through the warning messages but this one has me stumped. Any comments /
suggestions?
2) Also, regarding chiller COP input in the wizard mode. I assume that
the full load COP is the input and not the part load (less than 150 ton,
electric, air cooled). This is what I believe is the case from reviewing the
various documentation (eQUEST tutorials, ASHRAE Users Manual, etc.) but am
not 100% sure now. Here is a print screen from a selection for reference:
Michael:
This is getting a bit "Star Trek". eQuest does its 8,760 hour simulation based
on input provided by both the user and the weather file. What you seem to be
seeking is REAL TIME information, avalable only through multple sensor inputs.
For that skin load parameter, you might use eQuest to generate the building skin
loss baseed on outdoor temperature, place these numbers in a spreadsheet, thern
have an outdoor air temperature sensor pick the number based on the delta T
(indoor to outdoor).
You could?use eQuest to generate your range, based on whatever is the driving
parameter is, then have a number come from a programmed calculation to display
"Real Time" output.
You can always ask Chief Engineering Officer Montgomery Scott. Scotty can fix
anything..
John R. Aulbach, PE, CEM
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URL:
A little bit late in the response, but have another suggestion to
"measure" your building skin heat loss with the BMS.. Since your
heating system is designed to provide the heat the building is losing,
you could just use the total heating load in the building and subtract
any ventilation heating and local reheat (if a VAV system). If it's a
complex system then this would be difficult, but if it's all VAV boxes
it would be a single calculation for each VAV box with reheat and then a
summation for the total.
Good luck,
Greg Collins
Hi All,
By the way, many thanks to all the contributors and organizers of this
energy modeling resource - it is fantastic!
1) I have received several of these warning messages (20+) and they refer
to a specific hour and occur over winter and late fall in hot, humid
Georgia. It occurs when a standard VAV system with chilled water cooling
with electric re-heat is modeled including (and not including) a pre-heater.
It only occurs in one, sometimes two, shells but when I delete that shell,
the warnings pop up in another shell. I am usually able to detective my way
through the warning messages but this one has me stumped. Any comments /
suggestions?
**WARNING*******************************************************************
***
Zone: EL3 ENE Perim Zn (G.ENE2) could not successfully
allocate all equipment energy to the 5-minute bins
because of an equipment overload. The peak load
used in ECONOMICS will not include the fraction due
to the overload, but the PLANT reports will.
Mon/Day/Hour: 2 9 10 Energy: 9.2 Unallocated: 0.671
2) Also, regarding chiller COP input in the wizard mode. I assume that
the full load COP is the input and not the part load (less than 150 ton,
electric, air cooled). This is what I believe is the case from reviewing the
various documentation (eQUEST tutorials, ASHRAE Users Manual, etc.) but am
not 100% sure now. Here is a print screen from a selection for reference:
Best wishes for a Happy Holiday!
Jeffrey G Ross-Bain, PE, LEED, BEMP