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energy recovery ventilators; ERVs; heat recovery ventilators; HRVs; enthalpy wheels; exhaust air transfer ratio; EATR; condensation nuclei particle counter; CPC; indoor air quality; IAQ; thermosiphons; carry-over contamination; cross-over contamination; aerosol particles; particle contamination; aerosol particulate matter; air pollution.


This paper provides results from a study that characterized the particle distributions found from variable contaminated airstreams in energy recovery ventilators (ERV) during two different test scenarios. The first scenario involved the measurement of the particulate concentrations during an operational situation when the pressure differential forces cross-flow leakage between the exhaust and intake streams. The second scenario involved the characterization of aerosol particulate concentrations from the carry-over contamination when the wheel was not in operation. The findings from the study concluded that if a source of aerosol particulate matter is present in an environment utilizing an ERV system, then cross-over and carry-over contamination will occur proportionally to the amount of aerosol particulate matter released into the system.


This is the AAM of Handy*, R.G., Rodgers†, K.L., Wang†, J.A., Tumey†, M.S., Rodriguez†, D.L. and Hutzel, W.J., (2010). The characterization of aerosol particle contamination as the result of carry-over and cross-over in enthalpy wheels, International Journal of Nanoparticles, Vol. 3, No. 4, pp 378-389. Copyright Interscience Publishers, it is made available here CC-BY-NC-ND, and the version of record is available at