Hospital Microbiome Project Overview of building science measurements January 15, 2013 Dr. Brent Stephens and Tiffanie Ramos, Illinois Institute of Technology Dr. Jeffrey Siegel, University of Toronto Dr. Brent Stephens, Ph.D. Assistant Professor Department of Civil, Architectural and Environmental Engineering Illinois Institute of Technology [email protected]Built Environment Research Group www.built-envi.com Advancing energy, environmental, and sustainability research within the built environment
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Hospital Microbiome ProjectOverview of building science measurements
January 15, 2013Dr. Brent Stephens and Tiffanie Ramos, Illinois Institute of TechnologyDr. Jeffrey Siegel, University of Toronto
Dr. Brent Stephens, Ph.D.Assistant Professor
Department of Civil, Architectural and Environmental EngineeringIllinois Institute of Technology
• We are tasked with characterizing the hospital in mostly non-biological ways during the yearlong study– Outdoor air ventilation rates– Human occupancy– Temperature + relative humidity + light intensity– Room pressurization– Surface characteristics
• We will assess by measuring a variety of parameters in:– Patient rooms (x 10)– Mechanical rooms (x 2)
• Experimental plan development– Initial plan by Jeffrey Siegel (University of Toronto)– Three hospital visits by IIT– Feedback from UC oversight committee, facilities, and engineers
Building science experimental plan
• We have two main priorities with our measurements:1. Get the measurements done accurately
2. Do so in the least invasive way possible
• Our current plan will require some minor room modifications– Purpose is to limit in-room interactions and retrieve data from hallway– Mostly small penetrations in ducts and walls
• We are working on these
• Patient rooms– 5 rooms on each of the 9th and 10th floors
• West wing– 9th floor
• Rooms 09014-09018– 10th floor
• Rooms 10014-10018
Patient room measurements
• Four measurement locations in each patient room– Measuring at 5-15 minute intervals
1. HVAC return grille
• CO2
• Pressure (flow)• Temperature and RH• HVAC filter-based microbial sampler
• USB cables through fire wall• USB cable output at nurse stations• HVAC filter media installation
– Magnetic filter frame
• Loose cables in the plenum (and potentially in sight)– Return air and supply air
• Exact location of portable HOBO logger– Magnetic
• Occupancy sensor– Likely magnetic
• Power requirements– Low voltage DC, hopefully from extension cord in plenum
• CO2 absorber column just outside in the hallway plenum
• Pressure taps in return and supply ductwork
Longer term setup and sampling plan at the hospital
• Immediate– HVAC filter on 1-2 sample return grilles– Can we collect enough aerosols to detect microbial communities?– If so, we will proceed with media and frame order
• Mid to late January– Install an entire setup as a prototype in one patient room– Verify our equipment plan and order additional supplies– Test our “intensive” calibration procedures– Also explore mechanical room installations (much less invasive)
• Late January to early February– Replicate successful prototype in patient rooms
Particle removal efficiency of HVAC filter media
.
Alcove
Cabinets
Supp
ly D
iffus
er
Return Grille
Bathroom
Power
USB
Tubing
Voltage Output
Firewall
Occupancy Sensors
2” conduit through firewall
AC power strip or multi-outlet extension cord (need 3) from outlet behind TV: 120 V
12 VDC, 1000 mA
From the AC power strip, 2-3 12V DC, 1A power supplies will connect to our equipment. Very low power. UL Listed.
Two adjacent rooms can feed one alcove, supplying:4 USB cables for data retrieval, and2 0.25 inch outer diameter tubes for absorber column (for CO2) All through a 2 inch conduit through firewall (exact location TBD)
Patient Room Building Science Equipment Layout
Hal
lway
Fire
wal
l
Note on voltages:DC power to instruments (red) is 12VDC, 1A
Voltage output is for data output (purple) is maximum 0-2.5 VDC