I have to model a building according to Annex G of ASHRAE 90.1-2007. In
that building there is a school canteen. The food is prepared with natural
gas. How could I estimate the energy that is needed for the meal of one
person?
With Regards
Francesco Passerini
natural gas for school canteen
Aug 22, 2013
I believe ASHRAE text books have a DHW/person table for various building types. I know they have hotels, dormitories, and apartments. Need to check on a restaurant setting.
?
John Aulbach
Is it an existing building? If so, another way to approach it would be to
get an idea of the baseline(non-heating) natural gas usage from the utility
data(pick a late spring or early fall month when school is in session),
which would be made up of domestic hot water + cooking. Dhw is easier to
estimate per person, and subtracting that, you could get an idea of the
cooking use(I know you're not using eQuest, but you could start w an eQuest
default for per person hot water use in a school) . Both cooking + dhw are
probably fairly small.
Hello Mr. Passerini,
Not done it yet in a project but seems like process load to me - one that would remain same in both the proposed and baseline.
That said, one could check with the school canteen staff what the rate of consumption is (per child) if the existing school facility does it's cooking on same fuel?!
Or else, if it helps as a wild indicator - here in India, my family of 2 adults and 2 kids (age 6 and 2) consumes roughly 30 kg of LPG (liquified petroleum gas) for 2 months. We cook 1 to 2 times in a day using LPG with bit of reheating /cooking done using the microwave and toaster/ mixer used mostly in the mornings. You will need to look up the calorific value of LPG versus natural gas and run some back-of-the-envelope calculations to extrapolate day-time US school cooking requirements from an Indian household consumption for 3ish-member family for their daily meals over 2 months.
It will be good for you to have a few other reference points. And it'll be good to know what and how you crack it....
best,
Neeraj
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This is a screenshot from the 2010 Buildings Energy Data Book put out by the Department of Energy - it might be useful to you for an average estimate.
Overall - it's a really useful publication and its free. http://buildingsdatabook.eren.doe.gov/DataBooks.aspx
Vikram Sami
Hi;
I would suggest AO Smith water heater and boiler manufacturer sizing
software available on line at
http://www.hotwatersizing.com/Application.aspx
I have designed and installed several projects including an office
building cafeteria with gas fired
water heaters combined with a 750 gallon per day Solar thermal array.
using AO Smith. Good Stuff.
bye.
I've been keeping this in my bookmarks for my next commercial kitchen to model:
http://www.fishnick.com/design/resources/leed/
The spreadsheet here has lots of collected data on typical/baseline kitchen equipment. More on their website to read up on to see where they're coming from.
NICK CATON, P.E.