Waterside and airside economizers design considerations for data center facilities.(Report): An article from: ASHRAE Transactions

Waterside and airside economizers design considerations for data center facilities.(Report): An article from: ASHRAE Transactions Review

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This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on January 1, 2010. The length of the article is 7106 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.

From the author: Applying airside and waterside economizer to data center projects requires additional consideration to fulfill the unique design criteria that is not common to other commercial building types. Waterside economizer design considerations include proper equipment sizing, cooling tower freeze protection, pump design for parallel and series configuration, and control strategies for system stability. Airside economizer design considerations include humidification, particulate contamination, gaseous contamination, fire prevention, smoke detection, supply and return air balancing.

Citation Details
Title: Waterside and airside economizers design considerations for data center facilities.(Report)
Author: Yury Y. Lui
Publication:ASHRAE Transactions (Magazine/Journal)
Date: January 1, 2010
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 116 Issue: 1 Page: 98(11)

Article Type: Report

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Dehumidification of outdoor air in datacom environments for air-side economizer operation.(Report): An article from: ASHRAE Transactions

Dehumidification of outdoor air in datacom environments for air-side economizer operation.(Report): An article from: ASHRAE Transactions Review

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This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on January 1, 2009. The length of the article is 7468 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.

From the author: The decision to activate an air-side economizer is typically based on a comparison of the outdoor and return air enthalpy of the two airstreams; the stream utilized is the one with the lowest enthalpy. For data centers that comply with the high supply air conditions recommended in ASHRAE's Thermal Guidelines for Data Processing Environments (ASHRAE 2004a); however, conditioning the return air typically only requires sensible cooling. If the outdoor air with low enthalpy but high dew point is utilized, a dehumidification process is needed in addition to a sensible cooling process. This dehumidification process (desiccant or otherwise) will have a COP different from sensible cooling, which will affect the range of psychrometric conditions suitable for economizer use. The purpose of this paper is to look at the efficiency of the dehumidification process (mechanical refrigeration vs. desiccant) needed to utilize this high dew point outdoor air to allow for air-side economizer operation.

Citation Details
Title: Dehumidification of outdoor air in datacom environments for air-side economizer operation.(Report)
Author: Thomas A Davidson
Publication:ASHRAE Transactions (Magazine/Journal)
Date: January 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 1 Page: 71(11)

Article Type: Report

Distributed by Gale, a part of Cengage Learning

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Jul 23, 2011 21:26:36