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Numerical analysis of time required for destratification in warehouses.

Number: pap. 3126

Author(s) : POLANDER M. D., HARDER E. D., JUNKER J. F., et al.

Summary

A large percentage of energy in buildings is consumed to for heating, cooling, and ventilation to maintain the indoor environments preferred for human comfort, and the storage of goods. One way to reduce energy costs for indoor enclosures is through the manipulation of thermal stratification. In heating, removing the stratification phenomena has been linked to savings due to the reduction in driving temperature difference at the ceiling. The primary method of destratification is the utilization of ceiling fans, which have a parasitic load that offsets energy savings. A solution to eliminate the reliance on grid power is the use of solar photovoltaic powered fans that are not grid-tied. However, there is less solar resource available during the heating seasons when destratification is needed most. Thus, the objective of this study was to estimate the minimum required fan duty cycle to maintain a destratified temperature profile using a numerical analysis. The simulation assessed the time required to maintain a destratified environment based on inputs such as fan rated flow rate, spacing, and warehouse size. To establish the quality of the numerical analysis, two experiments were created to observe the impact of destratification. One experiment was located at a large distribution center, the other was a small classroom. The data collected from these experiments was be compared to the models developed to validate the findings. It was found that a destratification fan could maintain a destratified environment by operating for approximately 35% of a given time period.

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Pages: 10

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Details

  • Original title: Numerical analysis of time required for destratification in warehouses.
  • Record ID : 30024733
  • Languages: English
  • Subject: Environment
  • Source: 2018 Purdue Conferences. 5th International High Performance Buildings Conference at Purdue.
  • Publication date: 2018/07/09

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