ASME PTC Air Heaters. ; Status: Active, Most Current; Document Language: English; Published By: ASME International (ASME). The Code on Definitions and Values (ASME PTC 2) defines the meaning and values of basic technical terms and numerical constants that are. Asme Ptc Air Heaters Bw () – Download as PDF File .pdf), Text File .txt) or read online.
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EVALUATION OF AIR HEATER PERFORMANCE AND THE ACCURACY OF THE RESULT | inha samadin –
The following example shows the evaluation of one of the incrementalchangeterms required by Equation The computedvalue of the TCFGOT should be less than or equal to the design flue gas temperature,if the air heateris performing properly. The forms of these equationsagreewith the shapesof the curvesin Figures 2 and 3. To evaluatethe bias error associatedwith the air temperatureat the inlet: The parametervalues used for the estimation ptv the uncertainty of ptv TCFGOT and the bias and random erroreassociatedwith them are shown below in Table I.
Remember me on this computer. The gas is assumedto behave ideally and the velocity is constant over the entire cross-sectionalareaA.
There were no books found for the applied search filters. Errors in measurementsare of two types: To overcomethis, the PTC specifiesthat the measuredflue gas outlet temperaturemust be correctedfor differencesfrom design inlet air temperature,design inlet flue gas temperature,design X-ratio, and designflue gasrate. Should the manufactureralsoprovide proceduresfor calculating the specified PTC temperaturecorrections,the results can be checkedusing the proposedprocedure.
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ASME PTC 4.3
The uncertainty for a duct traversewith as few as4 points is still dominated by the bias errors. The methods followed in deriving the estimatesof the uncertainty of the individual parametersarepublished by ASME. Thesepredicted the performancetemperature;that is, the expectedexit flue qsme the actual operating conditions.
For the examplepresented,the estimateduncertainty is axme. Air leaked from outside of the air heaterinto the flue gasheating the primary air.
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Thus, there can he no correction to beat transfer within the air heater for air leakage.
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Each air heater heats both primary and secondaryair asmr half of the unit in separatesectionswith the flue gas mixed before and after the tir heater. The algorithm was of the form: If you like to setup a quick demo, let us know at support madcad.
If the denominatorof Equation A5 is set equal to Sum1and the numerator equal to Sum2 to simplify the resulting equations,thesepartial differentials are: That is, the difference between f. Similarly, for the deviation from the design entering flue gas temperature,the temperature correotion is: Watts DOE, FETC With the increasedemphasison the efficiency of fossil-fuel-fired, steamgenerationfacilities, the performance of ancillary equipment is becoming increasinglyimportant.
For a numerical approach, Equation 16 must approximate the surfaceofthe function as pc linear segmentparallel to the true functional relationship. Asms 17 is then usedto estimatethe overall uncertainty interval. Temperature Traverse Uncertainty Calculation The weight averagetemperatureof a gas flowing in a duct is basedon a flow weighted average of the temperaturesobtained from a standardtraverseof the duct.
ASME serves this wide-ranging asmd community through quality programs in continuing education, training and professional development, codes and standards, research, conferences and publications, government relations and other forms of outreach. Enter your personal account email address to request a password reset: If these temperaturecorrectionsarenot provided by the equipment manufacturer as algorithms or plotsthey can tpc estimatedby the procedurepresentedin this paper.
In the caseof the bias error, the crossproduct telms accountfor essentially all of pfc error in determining the averagetemperature. An air heater is shown schematicallyin Figure I.
If there were no crossproduct terms, a duct traverseof 12 samplepoints in Equation A5 would require 72 terms.
The air heaterson Unit 2 were replacedto improve unit efficiency as part of the demonstration program. This paper addressesthe issue of properly evaluating the air heater performance and the accuracyof the final result.
However, this derivation will be general. Instead,performanceindicators such asthe measuredeffectivenessof the air- and gas-sidesand the X-ratio are compareddirectly againstdesign values.
Remember me for one month. For many of the parametersexamined in this work, the parameterswere a independentand all of the terms in Equation Al were evaluated.