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http://dx.doi.org/10.12813/kieae.2016.16.6.013

Calculation of Outdoor Air Fraction through Economizer Control Types during Intermediate Season  

Hong, Goopyo (Dept. of Architectural Engineering, Yonsei Univ.)
Hong, Jun (Dept. of Architectural Engineering, Yonsei Univ.)
Kim, Byungseon Sean (Dept. of Architectural Engineering, Yonsei Univ.)
Publication Information
KIEAE Journal / v.16, no.6, 2016 , pp. 13-19 More about this Journal
Abstract
Purpose: In this study, we examined outdoor air fraction using historical data of actual Air Handling Unit (AHU) in the existing building during intermediate season and analyzed optimal outdoor air fraction by control types for economizer. Method: Control types for economizer which was used in analysis are No Economizer(NE), Differential Dry-bulb Temperature(DT), Diffrential Enthalpy(DE), Differential Dry-bulb Temperature+Differential Enthalpy(DTDE), and Differential Enthalpy+Differential Dry-bulb Temperature (DEDT). In addition, the system heating and cooling load were analyzed by calculating the outdoor air fraction through existing AHU operating method and control types for economizer. Result: Optimized outdoor air fraction through control types was the lowest in March and distribution over 50% was shown in May. In case of DE control type, outdoor air fraction was the highest of other control types and the value was average 63% in May. System heating load was shown the lowest value in NE, however, system cooling load was shown 1.7 times higher than DT control type and 5 times higher than DE control type. For system heating load, DT and DTDE is similar during intermediate season. However, system cooling load was shown 3 times higher than DE and DEDT. Accordingly, it was found as the method to save cooling energy most efficiently with DE control considering enthalpy of outdoor air and return air in intermediate season.
Keywords
Air handling Unit; Intermediate season Economizer Control; Outdoor Air Fraction;
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Times Cited By KSCI : 1  (Citation Analysis)
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