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Modeling of Electronically Commutated Motor Controlled Fan-powered Terminal Units

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dc.contributor.advisor O'Neal, Dennis en_US
dc.creator Edmondson, Jacob Lee en_US
dc.date.accessioned 2011-02-22T22:23:47Z en_US
dc.date.accessioned 2011-02-22T23:45:49Z
dc.date.available 2011-02-22T22:23:47Z en_US
dc.date.available 2011-02-22T23:45:49Z
dc.date.created 2009-12 en_US
dc.date.issued 2011-02-22 en_US
dc.date.submitted December 2009 en_US
dc.identifier.uri http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7370 en_US
dc.description.abstract Empirical models of airflow and power consumption were developed for series and parallel variable air volume fan powered terminal units (FPTUs). An experimental setup and test procedure were developed to test the terminal units over typical operating ranges. The terminal units in this study used either an 8 in. (20.32 cm) or a 12 in. (30.48 cm) primary air inlet. All terminal units utilized electronically commutated motor (ECM) controllers. Data collected were compared against previous data collected for silicon controlled rectifier (SCR) units. Generalized models were developed for both series and parallel units, and compared against models developed for SCR units. In addition to the performance modeling, power factor and power quality data were also collected for each terminal unit. The power quality analysis included recording and analyzing harmonic distortion for current, voltage, and power up to the 25th harmonic. The total harmonic distortion (THD) was also recorded and presented. For the series terminal units, models were developed for fan airflow, fan power, and primary airflow. The models for fan airflow all had R2 values above 0.987. The models for fan power all had R2 values above 0.968. The models for primary airflow all had R2 values above 0.895. For the parallel terminal units, models were developed for leakage, fan airflow, fan power, and primary airflow. All of the leakage models had R2 values above 0.826. All of the fan airflow models had R2 values above 0.955. All of the fan power models had R2 values above 0.922. All of the primary airflow models had R2 values above 0.872. The real power THD was below 1.5 percent for both series and parallel FPTUs. The current THD ranged from 84 percent to 172 percent for series FPTUs and from 83 percent to 183 percent for parallel FPTUs. The voltage THD was below 1.4 percent for both series and parallel FPTUs. The performance models developed will help improve the accuracy of building energy simulation programs for heating, ventilation, and air conditioning (HVAC) systems utilizing ECM controlled FPTUs. Increasing the accuracy of these simulations will allow HVAC system designers to better optimize their designs for specific building types in a wide variety of climates. en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.subject HVAC en_US
dc.subject fan powered terminal units en_US
dc.subject VAV en_US
dc.subject ECM en_US
dc.title Modeling of Electronically Commutated Motor Controlled Fan-powered Terminal Units en_US
dc.type Thesis en
thesis.degree.department Mechanical Engineering en_US
thesis.degree.discipline Mechanical Engineering en_US
thesis.degree.grantor Texas A&M University en_US
thesis.degree.name Master of Science en_US
thesis.degree.level Masters en_US
dc.contributor.committeeMember Heffington, Warren en_US
dc.contributor.committeeMember Parnell, Calvin en_US
dc.type.genre thesis en_US
dc.type.material text en_US


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