ASME PTC 4.3 PDF

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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The bias errors and random errors, a, for this calculation are listed in Table A-I.

While normally severalair streamsarc present primary and secondary ,in this paper we examineonly one sectionof the air heater. For application of Equation 1, two additional, independenttemperaturecorrectionsare required.

ASME PTC 4.3

The calculated value oftbe TCXGT from an air heaterperformancetest must be equal to or less than the design value for optimal air heaterperformance. Help Center Find new research papers in: Substituting 14 into Equation 11 and then expandingEquation 1 by substituting Equations2,3,11, and 12, along with the air heaterperformance correlations Equations5 and 6resultsin the following revised equation: Details of the air zsme of the uncertainty analysis can be found in the referencedreports.

The bias error is aske the majority of the uncertainty evenwith only a four-point traverse. 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.

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Of interest is the fact that the uncertainty in the design of a heat exchangerestimatedby Jamesis much larger than the uncertainty in the estimateof the performance. The uncertainty is shown as pyc percent of the final calculatedvalue. This expansion is used to evaluatethe bias and random error contributions separately. Remember me on this computer. For many of the parametersexamined in this work, the parameterswere a independentand all of the terms in Equation Al were evaluated.

Substituting 44.3 8 into Equation 7 yields: The air heater is a souteeof lost thermal efficiency in two ways — air leakageinto flue gas side andpoor heat recovery.

EVALUATION OF AIR HEATER PERFORMANCE AND THE ACCURACY OF THE RESULT | inha samadin –

The ASME code predicts the temperaturecorrectedto the designvalue while the performancecurvespredict the expectedtemperatureat operating conditions. Air leaked from outside of the air heaterinto the flue gasheating the primary air. Theselatter temperaturecorrectionsare unique to a specific air heater.

In the caseof the Milliken study, the 44.3 equationsagreedwith results from the plots within the ability to read the plots.

Measurement Uncertain Part 1. Table A-I also lists the source of the bias and random errors for eachof the parameters. If the vendor baseshis X-ratio correction curve on an X-ratio with a design leak, this plot should be correctedto zero leak before generating Equation 6.

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If there were no crossproduct terms, a duct traverseof 12 samplepoints in Equation A5 would require 72 terms. Becauseof the non-linearity of the final equation, numerical approximationswete usedto determinethe differentials neededfor the propagation procedure.

Print 1 2 3 4 ase page sstarting from page current page. Errors in measurementsare of two types: In most air heaters,the majority of the air in the flue gasis leakagefrom the higher pressure, air- side of the air heater.

This createsa consistentbasis for the calculations. As previously mentioned, many of the crossproduct terms must be included in the bias calculationssince the sameequipment was usedto measurea parameter.

Equations similar to Equation 4 can be usedto estimatethe effect of one parameterindependentof the other parametersof the equationto obtain a temperaturecorrection asmd that parameteralone. Since the X-ratio is defined aathe weight times heat capacityratio of the air over that of the flue gas, the X-ratio can be approximatedas the ratio of the temperaturechangesfor the two fluids: Similarly, the gas density is calculated: The bias and random errors are propagatedseparatelyusing Taylor seriesexpansionsfor highly nonlinear equations: Background As part of the I-J.