Design Makes All The Difference...

Transcription

1 CAMFIL FARR Design Makes All The Difference... V type pleat will blind causing rapid increase in pressure drop. Filter media blocked = high Δp Uniform radial style pleat loads evenly, resulting in lower average pressure drop and long loading curve. 16

2 Design Makes All The Difference... Cont... * For a bag filter, ask for a tapered stitch! Tapered stitch Filter media blocked = high Δp 17

3 New Versus Old Filters

4 Sustainable Strategies Does your system have magnahelic gauges? Consider remove a filtration stage? Checked for issues with filter bi-pass?

5 Types of HEPA Filters... Polyurethane Sealant Fiberglass or Thermoplastic Separator with adhesive Anodized Aluminum Frame Microfiberglass HEPA media Gasket or Gel Seal Galvaneal or Stainless Steel Frame Aluminum Separator Panel-type HEPA Box-type HEPA 20

6 CAMFIL FARR Understanding HEPA Filters Viruses Droplet Nuclei Bacteria Efficiency % Particle Size (µm) 21

7 HEPA Filters Are Not The Same * HEPA filter selection is critical to cost effective design! HEPA Type: Airflow at 1.0 ΔP: Media Area (ft 2 ): Standard Capacity 1,060 cfm 154 ft 2 High Capacity 1610 cfm 301 ft 2 Very High Flow 2400 cfm 431 ft 2

8 Why is Room-Side Certification Important? How & where to use aerosol injection is often overlooked during the design process What location should aerosol be introduced? What type of terminal housing should an owner or engineer select & why? Ductwork Injection? 4 RA Injection? 3 AHU Injection? Hood Injection? 4

9 In-situ Test Issue Is An Operations Issue? Local injection vs. AHU / HVAC system dictates quantity of aerosol used. Go to calculation tool AHU AHU Aerosol Injection Versus LOCAL Local Aerosol Injection metric metric # of Hoods served by AHU Airflow per hood (cfm) // (m3/h) Airflow per hood (cfm) // (m3/h) Target Aerosol Concentration ( µ g/l) // (mg/m3) Total AHU service volume (cfm) // (m3/h) Initial Set- up time, stabilization (min) // (min) 2 2 Target Aerosol Concentration ( µ g/l) // (mg/m3) Certification Time per Hood (min) // (min) Aerosol Mass rate in the HVAC (g/min) // (g/h) Total Aerosol Loading per Hood (grams) Initial Set- up time, stabilization (min) // (min) Certification Time per Hood (min) // (min) Total Aerosol (EMERY) mass used to test 20 hoods (g) //(g) Additional time Time to go from one hood the another, re- plug, etc. aerosol generation still working estim. per hood (min) // min) Total Time for 20 Hood (min) // (min) h Total Aerosol Exposure Time per Hood (min) Total Aerosol Loading per Hood (grams) Losses in the ducts 20% 20% Total Aerosol (EMERY) used = total mass generated in the HVAC (g) // (g)

10 US EU FDA GMP Guidance Annex 1 -- Air Air Changes Changes per per Hour Hour For Air Class changes 100,000 not applicable (ISO 8) for supporting Grade A UDAF rooms, here airflow velocity sufficient and to uniformity achieve of at airflow least applies. 20 air changes per hour is typically acceptable. Air changes aren t specified for Non-UDAF zones. Clean-up or recovery time is defined: The particle limits given in the table for the at rest state should be achieved after a short clean up period of minutes (guidance value) in an unmanned state Significantly higher air change rates are normally needed for after completion of operations. Class 10,000 and Class 100 areas. This will generally require ac/hr depending on the effectiveness of the mixing and dilution. A recovery time test is required to qualify this performance. Clean air solutions

11 Air Changes Don t Predict Room Performance Contaminant Generation People / Gowning 75% Process 15% Plant 10% Contaminant Ingress Pressurization / Direction of Airflow Filtration Isolation Contaminant Removal Containment / Process Closure Local Exhaust Ventilation Room Performance Process Design Risk Mitigation ( percentages from NSF /UF) Ventilation Effectiveness Clean air solutions

12 Selecting the Correct System Configuration Should be Driven by the Application: 1. Acceptable Risk (for patients and staff) 2. Air -flow capacity 3. The degree and type of filtration required 4. Field validation (leak testing, filter testing) 5. Pressure drop or energy consumption limits 6. Mechanical spacing available

13 Non-Sustainable Facilities, Examples

14 Non-Sustainable Facilities, Examples 2

15 Standards: North America Versus Europe Eurovent has introduced a standard similar in nature to Energy Star ratings EN Though this is not applicable here yet, it will be adopted in the US and Canada, experts agree, in time.

16 Important points... Fine Fibers catch Fine Particulate (<1.0µm) 99% of all particulate in the air in the fine category According to a study by the Center for Healthcare Development, Small particles are responsible for the damage to our 50.7% of design firms are using out-of-date or non-applicable respiratory system and affect our health in general specifications Lasts longer, because there is nothing to discharge! According to BEN (built environment network); over 70% of the firms Coarse we reviewed fiber filters were using (use specifications an electrostatic from the charge 90 s or to older pass the ASHRAE test) * In real life: when they work, they fail

17 Stay Healthy Breathe Easy... Immediate Effects (may show up after a single exposure or repeated exposures) - irritation of the eyes, nose, and throat, headaches, dizziness, and fatigue. Such immediate effects are usually short-term and treatable. - asthma, hypersensitivity pneumonitis, and humidifier fever (PDF), may also show up soon after exposure to some indoor air pollutants. Long Term Effects - either after years after exposure has occurred or only after long or repeated periods of exposure. - include some respiratory diseases, heart disease, and cancer 32

18 Thank-You For Your Attention!!! Contact Information: Matthew Crouch, B.Sc. Life Sciences Segment Manager, North America East Camfil Inc Phone: