Table 9. Assumptions for estimating energy savings.

Table 10. Total monthly heat load

The monthly energy savings is calculated using Equation 4

FS=QC–QA100,000×Ƞ($0.8)

Equation 4. Energy savings

where,

FS = Fuel Savings

QC = Heat load for conventional system (Btu)

 QA = Heat load for AirBoss system (Btu)

 Ƞ = Heating system efficiency

 FS=705,498,704-519,220,740100,000×0.8 ($0.8)

 FS= $2,328.47 or 26%

 The same calculations were performed for varying average outside air temperatures and are shown in Appendix B.

Summary Conclusion: 

This engineering analysis concludes that the AirBoss – AirFlow design reduces the required compressor capacity needed by ~20% compared to a conventional system.  Using AirBoss air distribution units, the system is supplying the design cfm at the given off coil temperature. This is achieved by lowering the return temperature to the RTU’s due to de-stratification and increasing the cfm/ton of each RTU.  The energy saving for an AirBoss system is ~5% less for most cooling days compared to the conventional system. During heating mode, the AirBoss system reduces the heat loss through the roof and mixes the internal warmer air. During this mode of operation, the energy savings can range between 20% – 40% with the AirBoss system.

The direct economic benefits when utilizing AirBoss technology include a capital and an operational cost reduction.  The approximate capital and maintenance cost reduction can be determined by an engineering analysis based on geographic and application considerations. The energy savings presented in this analysis utilizes data extracted from the 2017 ASHRAE Handbook – “Fundamentals, Climatic Design Information Manual”, Chapter 14 and is based on a central Midwest location (Columbus, Ohio).  Expressed in temperature degree days, each area of the country will vary based on number of cooling degree days and number of heating degree days for heat/cool applications and the number of heat days for heat only applications. In Columbus, Ohio, for example, the number of temperature cooling days is 1137 and the number of temperature heating days is 5025, which would result in an approximate annual energy cost savings of 23.76%.  In Atlanta, GA, for example, the number of temperature cooling days is 1901 and the number of temperature heating days is 2640, which would result in an approximate annual energy savings of 18.37%.

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