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Re: [EnergyPlus_Support] ASHRAE 90.1 Interpretation_LAB Building System Selection



Javed,

the rest of the paragraph is relevant:

For laboratory spaces with a minimum of 2400 L/sof
exhaust, use system type 5 or 7 that reduce the
exhaust and makeup air volume to 50% of design
values during unoccupied periods. For all-electric
buildings, the heating shall be electric resistance.

You mentioned the building size meant that you had to use system 8, so I must infer that you have an all electric building.
Therefore, you should use System 8 for the Lab.
Schedule the system flow rate (both supply and exhaust fans) to be at 100% of design flow during occupied periods and 50% of design during unoccupied periods.

Also note that G3.1.2.10 likely applies as well and the system will likely require energy recovery at 50% effectiveness.

Jason


On Tue, May 15, 2012 at 10:54 AM, Javed Iqbal <eee.javed@xxxxxxxxx> wrote:
 

Dear All,

I am modeling a LAB+Admin mixed Area building and ASHRAE 90.1 system selection section (page no.-189) says 

"For laboratory spaces with a minimum of 5000 cfm of exhaust, use system type 5 or 7 and reduce the exhaust and makeup air volume to 50% of design values during unoccupied periods"

How shall i interpret this.. As per building size i need to choose System 8.

Any help would be highly appreciated!

Thanks!

--


Javed Iqbal, LEED AP, CEA
Energy Analyst   









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