Radiation Errors in Air Ducts Under Nonisothermal Conditions Using Thermocouples, Thermistors, and a Resistance ThermometerU.S. National Bureau of Standards, 1969 - 12 pages Studies were made to determine the radiation error in temperature measurements made with thermocouples, thermistors, and a resistance thermometer in moving air at velocities ranging from 300 to 1300 fpm when the temperature of the duct wall surrounding the air stream was from 0 to 50 deg F higher than that of the air in the center of the duct. To eliminate all but the variable under study, conduction errors were minimized to a point where they were almost nonexistent by using Chromel P-constantan thermocouple wire and by employing other techniques. Radiation effects were studied when the probe housing the three types of temperature sensors was unshielded and again when it was shielded. Under the test conditions that prevail in the testing of air conditioners and heat pumps in laboratories, it should be possible to reduce the error in temperature measurement of the moving air to about 0.2 deg F by a suitable combination of air mixers, duct insulation, radiation shields, and calibration techniques. (Author). |
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... Applied Technology . Published or in preparation are : BSS1 . Building Research at the National Bureau of Standards . ( In preparation ) BSS2 . Interrelations Between Cement and Concrete Properties : Part 1 , Materials and Techniques ...
... Applied Technology . Published or in preparation are : BSS1 . Building Research at the National Bureau of Standards . ( In preparation ) BSS2 . Interrelations Between Cement and Concrete Properties : Part 1 , Materials and Techniques ...
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... Applied Technology National Bureau of Standards Washington , D.C. 20234 DEPARTME NATIONAL OF COMMERCE BUREAU OF STANDARDS Building Science Series 26 Nat . Bur . Stand . ( U.S. ) , Bldg . Sci . Ser . 26 , 14 pages ( November 1969 ) CODEN ...
... Applied Technology National Bureau of Standards Washington , D.C. 20234 DEPARTME NATIONAL OF COMMERCE BUREAU OF STANDARDS Building Science Series 26 Nat . Bur . Stand . ( U.S. ) , Bldg . Sci . Ser . 26 , 14 pages ( November 1969 ) CODEN ...
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... applied . The manufacturer advised that the thermistors supplied had been aged at ele- vated temperatures , a precaution which is re- garded as necessary to impart stability . [ 3 ] A modified ratio bridge was used with the therm ...
... applied . The manufacturer advised that the thermistors supplied had been aged at ele- vated temperatures , a precaution which is re- garded as necessary to impart stability . [ 3 ] A modified ratio bridge was used with the therm ...
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... applied suddenly in the hollow phenolic tube ( designated as C on figure 1 ) to the plastic tube housing the lead wires . There was no indication of temperature change on any of the indicating instruments for the thermocouples , the ...
... applied suddenly in the hollow phenolic tube ( designated as C on figure 1 ) to the plastic tube housing the lead wires . There was no indication of temperature change on any of the indicating instruments for the thermocouples , the ...
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... Applied Technology , the Center for Radiation Research , the Center for Computer Sciences and Technology , and the Office for Information Programs . THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States ...
... Applied Technology , the Center for Radiation Research , the Center for Computer Sciences and Technology , and the Office for Information Programs . THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States ...
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15 cents 50 deg F access door Achenbach air mixing air velocity aspirated assembly automatic data processing Building Science Series Bureau of Standards calibration Cement and Concrete Chromel P-constantan thermocouple Concrete Properties Conditions Using Thermocouples curves deg F 28 determined Dewar flask diameter DIFFERENCE IN TEMPERATURE duct wall error in temperature experimental Faison FPM UNSHIELDED heat pumps heated section ice bath immediately upstream inlet air inner shield Institute for Applied instrument room insulated Interrelations Between Cement junction box large reference sensor mercury-in-glass thermometers minimizing conduction errors moving air National Bureau Nonisothermal Conditions OBSERVED READINGS platinum resistance thermometer Portland Cement radiation error radiation shields Reinhold Publ SENSORS dag F set of shields shielded probe shielded sensors shown in figure small reference sensor techniques temperature difference temperature measurement temperature sensors test conditions test duct test probe thermal conductivity thermistors thermo thermocouple wire types of sensors U.S. Government Printing velocity of 300
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