Air filters and LCC.ppt

7/28/2019 Air filters and LCC.ppt

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C L E A N A I R S O L U T I O N S

Air filters

and LCC

1


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Why?

2


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The efficiency


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Content

1. Energy consumption

2. Life cycle cost analysis3. Conducting an LCC analysis

4. Conclusions


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Energy

Cost of ventilation is important

Filter can contribute with 30% ofthe total energy cost in the

system

Filter is the most inexpensive

part of the system to improve


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In a typical ventilation system with one filter step in the inlet- and the outlet air, the

Pressure Drop is distributed as (Pa):

Ducts (inlet- plus outlet air) 500 40%Filters (inlet- plus outlet air)* 350 28%

Heat exchanger (inlet- plus outlet air) 240 19%

Cooling coils 60 5%

Heater 50 4%

Sound reduction (inlet- plus outlet air) 40 3%

Joint duct 10 1%

1250 Pa

Energy consumption of an AHU

* average two filters (175+ 175)

The filter is the only thing in an HVAC system

you can change at a reasonable cost.


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The increased cost of energy

Calculation of energy:

kWh/year1000

tdPqE

q = Air flow (m3/s)

dP = Pressure drop (Pa)

t = Operating time (hours/year)

= Total fan efficiency (0,1 - 0,7)


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2) LCC life cycle cost of filters

The life cycle cost for the filter is the cost of the:

Filters

Labour/service cost

Energy consumption

Cleaning of ventilation system

Disposal of used filter

= LCC


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LCC

life cycle cost of filters

Factors important for the LCC:

Filter designOutdoor environment

Fan efficiency/type of system (VFD, belt driven fans etc..)

Energy price

Present cost calculation


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LCC of the filter solution

Normally 70% of the Life

Cycle Cost of a filteris the

energy consumption.


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The filter construction and design

The service life of a filterincreases exponentially to thesurface area, 50% more areawill double the service life

The pressure drop developmentwill be much lower with a largesurface, using a optimised

construction


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Outdoor environment

The outdoor environment impacts the lifetime performance

of air filters significantly

Estimations of the inlet air quality are very important

Field tests of air filters in real environment is essential

(efficiency and loading characteristics)


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Real life measurements


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3) Conducting a LCC analysis

CASE Study (CFSS-LCC EU)


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4) Conclusions

About 30% of the ventilation systems energy costcomes from the air filters

The filter is the easiest component to replace in anAHU

LCC analysis = optimise the operating costs andthe energy consumption.

An LCC-analysis of a real situation consists of a

number of input data that has to be considered

Good air filters = energy and operation costsdrastically reduced


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Thank You for your attention

Documents

Air filters and LCC.ppt