The main purpose for using air filters in building air handling units is to supply clean filtered air for the people inside to breathe without risk to health. The secondary purpose of Air Filters in building HVAC systems is to filter the air to keep clean and protect the air plant duct system and the internal fabric of the building. Better filters upstream of the coils and heat exchangers in the system will also inhibit build up of dirt and dust deposits on the coil fins and heat transfer surfaces. Energy loss due to increase in pressure drop across the coils and heat exchangers is prevented. Another benefit is that the coil heat transfer efficiency is preserved for a much longer time. The need coil cleaning and duct cleaning can be reduced with longer periods and saved costs between cleans.
The main area of interest to your client is to save money. This can be achieved with Low Energy Air Filters by reducing the cost of the filters over time because they last longer. The energy consumption is reduced because they have a lower pressure drop. The maintenance costs and disposal costs are reduced because the filters are longer lasting. Other system related costs are also reduced by use of Low Energy Air Filters. All these cost elements are included in the Eurovent Life Cycle costing model (LCC for short) Energy consumption can also be related to the environmental impact of increased levels of CO2 caused . The govenment CRC, Carbon Reduction Commitment is targetting large users of energy such as your clients and taxing them if the
Here is a simplistic view of a ventilation system, so we can better understand the rest of the presentation. We need to take external air and make it suitable for internal use (stable temp, humidity, remove pollutants etc) All the components of the ventilation system work to prevent air movement (flow resistance) which we measure as pressure loss. Water will not flow up hill against gravity, you need a pump and the input of energy. The fan is the same, it requires the input of energy to drive the air through the ventilation system. This is where the energy cost arises from The flow resistance of most components is fairly stable through life, However the flow resistance of filters depends on their construction and varies through life, this is where the opportunity for energy and cost optimisation arises.
This Low Energy Air Filter is the most efficient LCC solution for both particulate efficiency and energy efficiency. It has the longest life compared to any other F7 filter class on offer for HVAC applications.
Filters can account for up to 30% of the total flow resistance of a typical ventilation system – therefore up to 30% of the total energy cost. Yet – filters are readily available that minimise energy cost and can be easily upgraded. Filters dramatically affect the energy consumption
The Life Cycle cost elements listed here show the cost elements of the Eurovent LCC model. The bulk of the savings are in the energy consumption which is typically between 70% and 80% of the model. The other elements, in particular the maintenance costs can also show significant savings. Generally a saving can be made in each one of these elements.
Quality of manufacture of Air Filters is important. To produce Low Energy Air Filters in bag filter form it is necessary to make media pockets with controlled media spacing. The pockets have a tapered profile to allow even flow of air across the full area of the media. Any contact between media pockets stops air flow and increases pressure drop across the filter.
This is a typical example of a city centre office block that now requires an Air conditioning inspection and report. Considerable energy savings can be made if Low Energy Air Filters are recommended.
A two stage filter system can often be replaced by a single stage system. The energy saving is indicated above. For a recommended F9 solution (EN13779:2007) a 2 stage F7 solution can be used. This will still show a 40% saving over the original G4 panel and F7 bag filter system shown.
Your Larger AC Inspection clients will be managing property portfolios that can number many hundreds of commercial properties. This impact slide indicates the estimated savings possible with a large number of sites.
This is truly a quick win If you compare to other elements within the AHU the decision is a simple one It can be done straight away without capital cost
The opportunity shown on the previous slide needs to be reported and a solution provided. There are a variety of Low Energy Air Filter solutions available that can be tailored for the needs of each individual AHU system.
The full Life Cycle Cost analysis will provide detail values for labour, waste and CO2 etc. Our mobilisation process includes software that allows for a rough cut of the predicted savings available from making these changes
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Clean air solutions
THE CAMFIL GROUP
Peter DymentPeter Dyment
Be a Company Energy Hero
2014 Group sales of £450m
24 production plants
Sales companies in 25 countries
Agents and representatives in more
than 50 countries
Clean air should be aClean air should be a
human righthuman right
Low Energy Air Filters
Clean air inside city
And running costs
Risk to Health from
Traffic air pollution
N02 and PM2.5
Camfil City M - Air purifier – Clean Indoor Air at point of need
Low Energy Air Purifier
Air Flow Rate
6 Fan speeds
The only Eurovent A+ rated F7 filters currently available 2015
Eurovent HVAC Air Filter Energy Rating 2015
Uses the energy equation
with 50% fan efficiency and
6000 hours running time
All Eurovent Certification data is publicly
Air Filter Classification
The filter test standard
that classifies air filters
G2 – F9 is EN779:2012
F7 as a minimum and
F9 as the advised for
the required particulate
For HEPA and ULPA
E10 - U17
Air Handling Unit energy flow
input via motor
Clean air solutions
q = Air flow (m3
dP = Pressure drop (Pa)
t = Operating time (hours/year)
η = Fan efficiency (0,1 - 0,7)
Energy consumption from air