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Air Handling Unit Supply Air Temperature Optimization During Economizer Cycles
(Texas A&M University (http://www.tamu.edu)Energy Systems Laboratory (http://esl.tamu.edu), 2007)
Most air handling units (AHUs) in commercial buildings have an air economizer cycle for free cooling under certain outside air conditions. During the economizer cycle, the outside air and return air dampers are modulated ...
Performance Analysis of Dual-Fan, Dual-Duct Constant Volume Air-Handling Units
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2001)
Dual-fan, dual-duct air-handling units introduce
outside air directly into the cooling duct and use two
variable speed devices to independently maintain the
static pressure of the hot and the cold air ducts.
Analytical ...
Impacts of Static Pressure Reset on VAV System Air Leakage, Fan Power and Thermal Energy - Part I: Theoretical Model and Simulation
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2007)
As for a variable air volume (VAV) system, the air duct static pressure is a typical control variable maintained by modulating supply fan speed. The static pressure equals to the summation of the duct pressure loss downstream ...
Achieving High Chilled Water Delta T Without Blending Station
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2007)
Typically a blending station is designed to ensure that its user is able to avoid low chilled water return temperature in the district cooling system. When the chilled water return temperature drops to a low limit, building ...
Economizer Control Using Mixed Air Enthalpy
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2007)
Enthalpy economizer can theoretically save more energy than temperature based economizer. However, the requirement of outdoor air humidity measurement in the traditional enthalpy economizer control made it impossible. A ...
Implementation of the Laboratory Air Handling Unit Systems (LAHU)
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2003)
The LAHU system has been designed,
installed, and commissioned in a large university
research building. This paper provides detailed
information about the demonstration project,
including the specific LAHU system ...
Continuous Commissioning(SM) of a Thermal Storage System
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2001)
Chilled water thermal storage systems can
reduce the electrical demand charge during the onpeak
months. However, operational problems such as
the inability to fully charge the system or premature
discharge of the stored ...
Development of In-Situ Fan Curve Measurement with One Airflow Measurement
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2003)
Fan airflow is the key parameter for air volume
tracking control in variable air volume systems. One
of the airflow measurement methods is to determine
airflow using the fan speed, fan head, and fan curve.
Both fan speed ...
Impacts of Static Pressure Reset on VAV System Air Leakage, Fan Power and Thermal Energy - Part 2: Case Demonstration for a Typical Climate System
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2007)
In Part 1 of this paper, the theoretical models, integrating the fan airflow, fan head, air leakage factors, are developed to analyze the impacts of the static pressure reset on both pressure dependent and pressure independent ...
Continuous Commissioning® of a Single Fan Dual Duct System in an Office Building
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2005)