Building heat load contributions from medium and low voltage switchgear--part II: component and overall switchgear heat gains.(Report): An article from: ASHRAE Transactions
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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, 2009. The length of the article is 4642 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: Utility power sub-stations, industrial plants, and buildings use electrical power equipment in low voltage (LV) and medium voltage (MV) levels. A large number of electrical brands and products together with a lack of power efficiency information provide complications for HVAC engineers and designers in predicting power equipment heat loss. This is very true for LV and MV switchgear. Environmental heat gain information is very important for sizing HVAC equipment. The objectives of this paper are to update information on heat loss by LV and MV switchgear and to show these losses can be predicted. Two spreadsheet models are presented that calculate the power loss for low and medium voltage switchgear and practical examples are shown for each case using realistic information. The spreadsheets provide an approximation of the dissipated power losses if actual current loadings are used. However, if breaker and bus amp ratings (unknown loading case) are used in place of the actual loadings, the dissipated power loss of the LV and MV switchgear will be overestimated. This emphasizes the need of using the actual loadings for each bus and circuit breaker to obtain realistic results.
Citation Details
Title: Building heat load contributions from medium and low voltage switchgear--part II: component and overall switchgear heat gains.(Report)
Author: Emilio C. Piesciorovsky
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 2 Page: 382(13)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
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