Hi, we are working in a Gas station with three different type of spaces.
1) Individual offices with one or two employees, naturally ventilated. For this spaces we will install CO2 sensors with a audible alarm so users could regulate windows. This comply with credit intent?
2) The minimarket and cafeteria areas are densely occupied spaces mechanically ventilated. The HVAC equipment is a heat pump rooftop. For these spaces we will install the same CO2 sensors from the offices, that will generate an audible alarm but without interfering in rooftop´s outdoor air flow quantity. Is this acceptable? Or we should have an automatic system that regulates outdoor air flow ir order to comply?
3) The kitchen is a non-densely occupied space mechanically ventilated. With several hoods that exhaust the air. Due to the type of activity, should we have CO2 sensors in the kitchen? Are we required to monitor outside air flow?
Thanks for the suggestions
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
April 12, 2012 - 4:32 pm
1) Yes
2) Yes, you need a CO2 sensor in each densely occupied space. You also need an outdoor airflow measurement device on your heat pump with an alarm if OA drops 10% below design. You do not need an automatic system to modulate the OA in order to comply. You system does not need to react if the CO2 alarm goes off, just need the alarm.
3) You don't need a C02 sensor in the kitchen if it is not densely occupied, but you do need an outdoor airflow measurement device on your make up air unit with an alarm if OA drops 10% below design (assuming you have a make up air unit to balance out the exhaust hoods).
Guillermo T. Adamo
ArchitectSursolar
55 thumbs up
April 25, 2012 - 11:53 am
Hi, we've been analyzing the LEED-on line form for this credit and we realized that measurement of outdoor air flow for mechanically ventilated in densly occupied spaces is not necessary. Is this correct? there is no place in the form to document this and in the LEED reference guide we just found that the only requirement for these places is to install a CO2 sensor, and airflow measurment is necessary just for non-densly mechanically ventilated spaces. Is this correct?
Regards,
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
April 29, 2012 - 1:23 pm
Guillermo,
You are correct. Per the credit language, you only need to measure the minimum outdoor air intake flow for mechanical ventilation systems where 20% or more of the design supply airflow serves nondensely occupied spaces.