Preliminary Tests for an Engineering Approach to Achieve Energy Efficient Airside Economizers without Humidity Sensors

Gang Wang, Li Song, Liping Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Outdoor air (OA) and return air (RA) humidity measurements are essential to implement combined differential enthalpy/temperature airside economizers at air handling units (AHUs). However, due to the lack of reliable air humidity sensors, economizers are more often disabled or replaced by less-efficient temperature economizers. On the other hand, the OA humidity ratio may be obtained from weather station data and the RA humidity ratio may be correlated with the supply air (SA) temperature under humid OA conditions when enthalpy economizers are applied. With these two hypotheses, the economizers can be readily achieved through an engineering approach without direct humidity measurements at AHUs. The purpose of this paper is to experimentally validate these two hypotheses. The engineering approach is explained first and then experiments are conducted on selected AHUs in three cities, Laramie, WY, Norman, OK and Miami, FL. The experiment results reveal that 1) the OA humidity ratio can be obtained from the weather station data with the standard deviation of 0.0010 kgv/kga (or lbmv/lbma) for dry and moderate humid climates and with the standard deviation of 0.0026 kgv/kga (or lbmv/lbma) for humid climates; and 2) the RA humidity ratio can be correlated to the saturated humidity ratio at the SA temperature with the standard deviation of 0.0005 kgv/kga (or lbmv/lbma) under humid OA conditions.

Original languageEnglish (US)
Title of host publicationAEI 2017
Subtitle of host publicationResilience of the Integrated Building - Proceedings of the Architectural Engineering National Conference 2017
EditorsJeffery S. Volz
PublisherAmerican Society of Civil Engineers (ASCE)
Pages456-469
Number of pages14
ISBN (Electronic)9780784480502
DOIs
StatePublished - Jan 1 2017
EventArchitectural Engineering National Conference 2017: Resilience of the Integrated Building, AEI 2017 - Oklahoma City, United States
Duration: Apr 11 2017Apr 13 2017

Publication series

NameAEI 2017: Resilience of the Integrated Building - Proceedings of the Architectural Engineering National Conference 2017

Other

OtherArchitectural Engineering National Conference 2017: Resilience of the Integrated Building, AEI 2017
CountryUnited States
CityOklahoma City
Period4/11/174/13/17

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Architecture

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    Wang, G., Song, L., & Wang, L. (2017). Preliminary Tests for an Engineering Approach to Achieve Energy Efficient Airside Economizers without Humidity Sensors. In J. S. Volz (Ed.), AEI 2017: Resilience of the Integrated Building - Proceedings of the Architectural Engineering National Conference 2017 (pp. 456-469). (AEI 2017: Resilience of the Integrated Building - Proceedings of the Architectural Engineering National Conference 2017). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784480502.038