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RESEARCH PAPERS

Experimental Validation of the Laboratory Air Handling Unit System (LAHU)—Part I: Winter Operation

[+] Author and Article Information
Yujie Cui

Energy Management, Nexant, Inc., 44 South Broadway, 5th Floor, White Plains, NY 10601ycui@mail.unomaha.edu

Mingsheng Liu

Architectural Engineering, University of Nebraska-Lincoln, 206C, PK1, 1110 S. 67th Street, Omaha, NE 68182lium@unomaha.edu

Kirk Conger

Building Systems Maintenance, University of Nebraska-Lincoln, Lincoln, NE 68588

J. Sol. Energy Eng 129(2), 235-242 (Apr 25, 2006) (8 pages) doi:10.1115/1.2710494 History: Received July 17, 2005; Revised April 25, 2006

The laboratory air handling unit (LAHU) system for laboratory buildings has been developed and optimized. Theoretical study has concluded that the LAHU with optimal outside air control and optimal heat recovery control significantly reduces thermal energy use, saves pump power consumption and improves office indoor air quality. This paper presents validation experiments of the LAHU energy performance for the winter operation in a large university research building including detailed experimental methodology, procedures and experimental energy savings results. The experiments establish that the LAHU can reduce annual heating energy consumption by over 30% and can reduce heat recovery pump power by over 50%peryear for this typical laboratory building. The experimental validation of the LAHU for the summer operation will be reported in a followup paper.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of LAHU system in the facility

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Figure 2

AHU1 mixed air temperatures in the base and LAHU systems

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Figure 3

AHU2 mixed air temperatures in the base and LAHU systems

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Figure 4

AHU3 mixed air temperatures in the base and LAHU systems

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Figure 5

Supply airflow rates in the base and LAHU systems

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Figure 6

Heating energy consumptions in the base and LAHU systems

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Figure 7

Regressed heating consumptions in the base and LAHU systems

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Figure 8

Heat recovery discharge air temperatures in the base and LAHU systems

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Figure 9

AHU1 mixed air temperatures in the LAHU and base systems

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Figure 10

AHU2 mixed air temperatures in LAHU and base systems

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Figure 11

AHU3 mixed air temperatures in LAHU and base systems

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Figure 12

Supply airflow rates in the base and LAHU systems

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Figure 13

Heating energy in the base and LAHU systems

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Figure 14

Heating energy regression with the base and LAHU systems

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Figure 15

Heat recovery discharge air temperatures in conventional and optimal controls

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Figure 16

AHU1 mixed air temperatures in the LAHU with conventional and optimal heat recovery controls

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Figure 17

AHU2 mixed air temperatures in the LAHU with conventional and optimal heat recovery controls

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Figure 18

AHU3 mixed air temperatures in the LAHU with conventional and optimal heat recovery controls

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Figure 19

Supply airflow rates in the LAHU with conventional and optimal heat recovery controls

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Figure 20

Heating energy consumptions of the LAHU with conventional and optimal heat recovery controls

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