Performance of Louvered Devices as Air MixersU.S. National Bureau of Standards, 1970 - 20 pages As part of a study evaluating methods for reducing thermal gradients within the cross section of an air stream, three louvered mixing devices were investigated. Each of these devices was found to be capable of reducing the cross-sectional nonuniformity of air temperature to a few percent of the entering value. |
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Page
... methods , and performance criteria related to the structural and environmental functions and the durability and safety char- acteristics of building elements and systems . These publications , similar in style and content to the NBS ...
... methods , and performance criteria related to the structural and environmental functions and the durability and safety char- acteristics of building elements and systems . These publications , similar in style and content to the NBS ...
Page 1
... methods for reducing thermal gradients within the cross section of an air stream , three louvered mixing devices were investigated . Each of these devices was found to be capable of reducing the cross - sectional nonuniformity of air ...
... methods for reducing thermal gradients within the cross section of an air stream , three louvered mixing devices were investigated . Each of these devices was found to be capable of reducing the cross - sectional nonuniformity of air ...
Page 5
... method of determining effective- ness , based on the range , is much simpler to calculate but could be more influenced by a sin- gle temperature value . If , for instance , either the maximum or minimum value were in error or differed ...
... method of determining effective- ness , based on the range , is much simpler to calculate but could be more influenced by a sin- gle temperature value . If , for instance , either the maximum or minimum value were in error or differed ...
Page 6
... method of determining effectiveness was used . Three patterns of temperature nonuniform- ity were used to determine how mixer effec- tiveness was influenced by variation of the ini- tial temperature distribution . The temperature ...
... method of determining effectiveness was used . Three patterns of temperature nonuniform- ity were used to determine how mixer effec- tiveness was influenced by variation of the ini- tial temperature distribution . The temperature ...
Page 17
... method of evalua- tion using temperature patterns was gained . This correlation indicates that flow visualiza- tion is a rather good but coarse method of eval- uation . Listed below are a number of designs which revealed relatively poor ...
... method of evalua- tion using temperature patterns was gained . This correlation indicates that flow visualiza- tion is a rather good but coarse method of eval- uation . Listed below are a number of designs which revealed relatively poor ...
Common terms and phrases
0.92 duct diameter 4.75 DUCT DIAMETERS air flow Air Mixers air passed AIR STREAM VELOCITY apparatus ASHRAE automatic data processing baffles blower Building Science Series Bureau of Standards cents circular band concentric louver mixing CONCENTRIC TEMPERATURE PATTERN cross section deg F Devices as Air DIAMETER DUCT FPM DIAMETERS MEAN VELOCITY direct the air DISTANCE BETWEEN MIXING downstream measuring station Duct Diam DUCT DIAMETERS MEAN duct wall elements in series evaluated FIGURE 17 flow rate held constant louver angle louver mixing device LOUVER SETTING louver-baffle mixing device louvered strip mixing MEAN AIR STREAM ment metal mixing effectiveness National Bureau normal path outer area path of flow PATTERN THREE QUADRANTS percent pitot-static tubes QUADRANT COOL QUADRANT TEMPERATURE PATTERN Resistance Thermometer shown in figure spacing between mixing standard deviation strip mixer strip mixing device tempera temperature difference TEMPERATURE PATTERN THREE test conditions THERMOCOUPLES THREE QUADRANTS WARM tion ture U.S. Government Printing velocity head
Popular passages
Page 1 - A schematic of the apparatus is shown in figure 1. Figure 2 is a photograph of the apparatus.
Page 20 - Announcement of New Publications in Building Science Series Superintendent of Documents, US Government Printing Office, Washington, DC 20402 Dear Sir: Please add my name to the announcement list of new publications to be issued in the series : National Bureau of Standards Building Science Series. Name Company Address City State Zip Code (Notification key N-339...