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

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Dedicated Outdoor air systems and building pressurization.(Report): An article from: ASHRAE Transactions

Dedicated Outdoor air systems and building pressurization.(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 July 1, 2010. The length of the article is 4854 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 central thrust of this paper is to introduce the concept of a balanced flow Dedicated Outdoor Air System (DOAS) integrated, physically and functionally, with a pressurization unit. The incentives for this concept include: improved total energy recovery (TER) equipment efficiency, lower first cost, no increase in the installation cost, reduced fan parasitic energy use, predictable building pressurization performance, and a very modest additional first cost for reserve capacity. This may be the next step in the migration path toward improved performance at reduced first cost for DOASs

Citation Details
Title: Dedicated Outdoor air systems and building pressurization.(Report)
Author: S.A. Mumma
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2010
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 116 Issue: 2 Page: 143(11)

Article Type: Report

Distributed by Gale, a part of Cengage Learning

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Customer Review

Jun 25, 2011 12:57:57