Dear Mr. Roger Chang
I was hoping if you could provide some information on the ASHRAE 62.1 2007 standard related to "Minimum Ventilation rates in breathing zone" for Hotel room applications. It has been mentioned that the outdoor air rate per person(cfm/person) for bedrooms/living rooms in hotels should be 5 compared to the earlier standard which said 11 cfm/person. This would probably mean a cfm of 10 per room which is considered to be low. Earlier the cfm requirements per room used to be 30. Also, the 2007 standard suggests 30 % more fresh air intake which would also result in the increase in contaminants in some countries where the quality of outdoor air is not good. So if we consider the CO2 level which should generally be 1000 ppm per zone, how much would increase in percentage of fresh air intake affect the CO2 level and how much should it go down approximately.
Can you please provide information on this matter and how does the 2007 standard work for hotel room applications.
Thanks!!
Roger Chang
Principal, Energy and Engineering LeaderDLR Group | Westlake Reed Leskosky
LEEDuser Expert
398 thumbs up
February 9, 2011 - 5:14 pm
Chirag, there's also an area-based component for hotel rooms at 0.06 cfm/sf, which should be added to the people-based component. At the default density 10 people per 1000 sf, this does equate to 11 cfm/person. Note that you may end up providing more ventilation to balance exhaust through the restroom in a hotel suite. Could you point out the reference for 30% increased ventilation? This is an optional LEED credit, but not required for basic ASHRAE 62 compliance. You're right that in some environments, bringing in additional OA is not desired. The base ASHRAE 62 rates are calibrated to typical CO2 generation from a person, so you generally don't need to worry about the actual CO2 level in a hotel room.