Presentation on theme: "Air Filtration - Energy Savings Total Cost of Ownership ROGER STAMPER SALES MANAGER CAMFIL FARR."— Presentation transcript:
Air Filtration - Energy Savings Total Cost of Ownership ROGER STAMPER SALES MANAGER CAMFIL FARR
2 Air Filtration Ratings –MERV Appendix J Filter Selection –The Air We Breath –How Does Filtration Work Course Fiber vs Fine Fiber Loading Characteristics Life Expectancy Performance –When Do I Change my Filters –Total Cost of Ownership Agenda items
What is MERV? M…Minimum E…Efficiency R…Reporting V…Value This standard establishes a test procedure for evaluating the performance of air-cleaning devices as a function of particle size. MERV is a single number value for the engineering community by which to select an air filter. It indicates how a filter performs at its lowest point of particle capture efficiency. ASHRAE Standard B With Appendix J
ASHRAE 52.2 – 2007(B) Addendum B Published (Sept 2008) Non Mandatory Appendix – Appendix J has been added – SPECIFIABLE value – MERV-A – The filter should be tested per ASHRAE 52.2 (including Appendix J) – The resulting MERV-A must have the same (or higher) numerical value when compared to the MERV value. Dust Holding Capacity was added Dust Weight Arrestance was added
ASHRAE 52.2 – 2007-B with appendix J Status of revision – January 2008 the committee approved the addition of the KCl conditioning step into 52.2 Informative Appendix – Appendix J Non mandatory This accomplished 2 goals – It give us a SPECIFIABLE value – Gets the method used and industry momentum will push it into the standard – Approved Addendum B Brings DHC and Arrestance into 52.2
9 Mechanical air filters remove particles from the air stream when particles come into contact with the surface of fibers in the filter media and adhere to the fibers. Principles of Filtration Pleated filters made from nonwoven fabrics operate chiefly on the principles of: mechanical filtration
Filters Operating Primarily on Straining, Sieving Metal Washables Fiberglass Throwaways Polyester Cubes/Pads Roll Filters ASHRAE 52.2 Efficiency MERV Grams of DHC Changeout Point 0.60 “ W.G. Media Velocity as high as 500 fpm
Inertia Effect, Primarily > 1 m Effect increases with increasing velocity, particle size Impaction, Inertia
Filters Operating Primarily on Impaction, Inertia Pleated or Extended Surface Filters ASHRAE 52.2 Efficiency MERV 6-8 ASHRAE Arrestance 90%+ Up to 200 Grams DHC Changeout Point - 1.0” Media Velocity >100 fpm
Interception effect, m Increases with increasing particle size, decreasing fibre diameter Interception
Filters Operating Primarily on Interception Bag Filters Rigid Filters V-Bed Filters ASHRAE 52.2 Efficiency MERV 9-16 Arrestance 92%+ DHC and Final Changeout Points Vary by System and Manufacturer Media Velocity < 35 fpm
Diffusion effect,< 0.5 m Increases with increasing fibre diameter, particle size, velocity Happens with all filters, more predominant as efficiency increases Diffusion
18 Principles of Filtration Methods of Contact ImpactionInterception Straining Diffusion
19 Principles of Filtration Another method is known as electrostatic and typically involves a large synthetic fiber which carries an electrical charge. This is how a nonwoven fabric produced chiefly from large fibers captures smaller dirt particles
Increases with increasing charge on fibre, charge on particle, decreasing, particle size, velocity Electrostatic Charge Attraction
21 Principles of Filtration Electrostatic Filters utilizing large diameter fiber media rely on electrostatic charges to increase their efficiency of fine particle removal. Large diameter fiber media is normally chosen due to low cost and resistance to airflow. However, these filters often lose their electrostatic charge over time because the particles captured on their surface occupy charged sites, therefore neutralizing their electrostatic charge.
Electrostatic Attraction Filters Bag Filters Rigid Filters Pleated Filters ASHRAE 52.2 Efficiency MERV Appendix J Efficiency MERV 7-11 DHC and Changeout Vary by Manufacturer.
23 An electrically charged television or computer monitor screen will attract nearby dust particles. Some particles land directly on the screen and are held in place by the charge. Others pass nearby, are attracted by the charged screen and are pulled onto the screen. Still others are attracted to the screen, but are not within range to be totally captured. Finally, other particles are simply too far away to feel any significant effect. To understand how an electrostatic fiber works, we can look at a television screen.
24 An electrically charged television or computer monitor screen will attract nearby dust particles. Some particles land directly on the screen and are held in place by the charge. Others pass nearby, are attracted by the charged screen and are pulled onto the screen. Still others are attracted to the screen, but are not within range to be totally captured. Finally, other particles are simply too far away to feel any significant effect. To understand how an electrostatic fiber works, we can look at a television screen. So, the question is, left un-cleaned, why doesn’t your television screen cake over with inches of dust since the particles are being held in place by an electrical attraction?
25 The dust particles accumulated on your screen will eventually act as an insulator and/or the screen will become discharged. The results is nearby particles are no longer attracted and captured.
26 Fiber Size & Particle Capture Imagine yourself a small dirt particle being carried through in an airstream. In which one are you more likely to get captured?
Coarse Fiber vs. Fine Fiber 27
When to Change Filters Time –Convenient & easier for SOP’s –Will use more filters –Higher disposal costs –Higher labor cost Resistance to Airflow (Pressure Drop) –Logistics more difficult –Maximize filter life –Lower disposal costs (less changes) –Lower labor cost Visual Inspection (Dirty filter)
When to Change Filters And the conditions say… –Inlet vanes are about 60% open –Filter gauge says 0.30”wg
When to Change Filters Appearance –What about these filters? –This one?
pleated filters in service
A filter that captures dirt will face pressures that are structurally challenging. 32 Principles of Filtration
Energy Costs Inventory Control Maintenance Costs Labor Costs Waste Removal Indoor Air Quality Apparent Expense Hidden Costs Filter First Cost Compliance Issues Performance Prob lems Administration Costs 1 st Cost TOTAL COST OF OWNERSHIP 33
34 High efficiency of capture of small particles in real life conditions over the entire life of the filter Indoor Air Quality Lowest real life average resistance while holding more dust as measured in real life conditions Filters that pass a test vs filters that work What Makes a Filter Compare Favorably on Total Cost of Ownership? Principles of Filtration
35 What does this mean for your facility? Average Facility 300,000 to 400,000 CFM $25,000 to $30,000 in Potential Energy Savings ?
What Does 1 / 10 th of an Inch Mean? 36 AB 1 The cost of flowing air through your system 2 3 What is the CFM per filter opening? What is the resistance to airflow? (in. w.g.)0.1 5 What time frame is being measured in hours? (1 year =8760) What is the fan efficiency? (typically 60%) What is the cost per kilowatt hour? ($.07 for example)$ Cost per opening per year:$ (B3*B4*B5/(8515*B6))*B7
39 Principles of Filtration Electricity by end use sector Electricity for HVAC - residential Electricity for HVAC - commercial Electricity for HVAC - industrial Approximately 30% of electricity used in United States moves air in HVAC systems
Longer Filter Life = Fewer Filters Less Waste Produced Decreased Landfill Impact Environment & The Air Filtration Impact Lower Carbon Footprint 40
41 Initial Purchase Price Total Cost of Ownership Fram Oil Filters: ‘Pay me now or pay me later’ The Two Paths To Cost Savings