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Dhruv and Ali provided the following answers to Sterling with SafeTraces:

Q1: Please provide PDFs of the full floor plan layout drawings for the entire building. Be sure to include 
square footage for each room and common areas. It is also very important to identify operable windows, if any? 

A1: Floor plans with room areas attached. 
Following files are attached for floor plans 
B0300-01-11X17 Astronomy Building-(1st floor plan)-2021 
B0300-02-11X17 Astronomy Building-(2nd Floor plan)-2021 
(current/anticipated occupancy assumptions would be helpful) 

 

Q2: What are the Astronomy Building's normal hours of operation?

A2: Monday to Friday (0800 hrs-1700 hrs.). Saturday and Sunday the building is locked. 

Q3: What is the air filtration rating for the spaces?

A3: MERV :: HEPA Filters at AHU, currently MERV-13. 

 

Q4: What is the Make/Model, age, specs and replacement/upgrade history of the existing HVAC system?

A4: Original AHU from 1990, Trane Model 41A, Serial K89H24684. Original AHU equipment schedule attached. AHU controls originally pneumatic, upgraded to DDC (Siemens) in 2016 to allow occupancy schedules to be implemented. Zone level (VAVs) are still pneumatic.  I believe the fume hoods are only energized when in use.  Heating in the building is hot water radiators and hot water VAV reheat (no heating coil at AHU) fed from hot water boilers. 30% glycol cooling coil in AHU, fed from air cooled chiller on site. 

Q5: What is the Make/Model and full specifications of the portable air purifiers expected to be used or are being used in the building? 

A5: I don’t believe any portable air purifiers are currently in use. 

 

Q6: Please identify all HVAC zones in the drawings. (Note: This is a command, not a question)

A6: See zone map drawings Paul sent previously. Please review the attached file 
CC-0300_09_V-700_RCX-Astronomy Building-Zones plan-AHU-EFU-2017 

 

Q7: How many air-changes per hour is the HVAC system currently providing?

A7: Will vary from room to room based on VAV damper position, ceiling height, etc. Based on a peak airflow of AHU (21,200 CFM), overall building area, and typical ceiling height (9’-0”), we’d have about 11.3 air changes per hour at peak load. 

 

Q8: What are the basic assumptions for outside air intake to aid in dilution/ventilation for all interior spaces? 

A8: AHU has a minimum OA position, and runs based on an occupancy schedule. We’ve temporarily changed our AHUs to run in occupied mode from 6AM to midnight for most of our units due to COVID-19 precautions. Unit is also sized for economizer when OA conditions allow. 

Q9: What are the weather assumptions for heating and cooling the interior spaces along with outdoor temperature and humidity estimates?

A9: I’m not positive what conditions the original designers used in 1990, but see page 2 of the “HVAC Systems” attachment from our facilities standards for our typical OA design conditions.