Restricted budgets challenge facility owners and operators to seek solutions that help save energy and reduce operating costs, while maintaining appropriate indoor air quality.
Evaluation of HVAC ﬁlters should include a comparison of total cost of ownership to have the largest impact on reducing total cost, while maintaining indoor air quality. The initial ﬁlter purchase cost can be as low as 7% of the total operating cost for HVAC air ﬁltration. Supply and return fans consume approximately 5% of all energy used. Utilizing HVAC air ﬁlters that have a low pressure drop over their life, can have a meaningful impact on this energy consumption. In addition, HVAC ﬁlters that last longer can be replaced less frequently, thereby reducing disposal and shipping costs, and potentially, saving labor and/or service costs.
There are ﬁve components of the total cost of ownership for HVAC ﬁlters:
1) cost to purchase the ﬁlters,
2) cost of the associated energy use,
3) cost of labor for installation and replacement,
4) cost of disposal and
5) cost of shipping ﬁlters to the facility.
In certain HVAC systems, the cost for the energy required to move air through the ﬁlters is often the greatest component of total operating cost. This energy cost is proportional to the average pressure drop of the ﬁlter over the time period assessed. The difference in energy cost of two different ﬁlter systems is proportional to differences in their respective average pressure drops.
There are several scenarios where tremendous reduction in energy may be achieved by using Nanofil HVAC ﬁlters that are currently under development:
1) when replacing ﬁlters with higher pressure drop,
2) when replacing ﬁlters which do not maintain low pressure drop over time and
3) when replacing a pre-and primary ﬁlter combination, wherein the combined pressure drop is much higher.
As an added beneﬁt, the reduction in energy use from lower pressure drop ﬁlters results in a reduction of CO2 emissions from power plants.
The cost associated with the labor of taking used HVAC ﬁlters out of the air handling unit (AHU), installing new ﬁlters, ensuring sealing of the individual ﬁlters to minimize air by-pass, and transporting the used ﬁlters to the disposal site, are referred to as labor cost. Nanofil Filters, which are designed and engineered with high filtration efficiency and low pressure drop may last longer than alternative competitive products.
The cost of ﬁlter disposal is inﬂuenced by many factors including volume, weight, and metal content.
The cost of shipping ﬁlters is partially determined by the key factors of ﬁlter volume and change-out frequency.