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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Instead,performanceindicators such asthe measuredeffectivenessof the air- and gas-sidesand the X-ratio are compareddirectly againstdesign values. An air heater is shown schematicallyin Figure I.
Asme Ptc 4.3 Air Heaters Bw (1991)
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. 4.3 a numerical approach, Equation 16 must approximate the surfaceofthe function as a linear segmentparallel to the true functional relationship.
As previously mentioned, many of the crossproduct terms must be included in the bias calculationssince the sameequipment was usedto measurea parameter.
From college students and early-career engineers to project managers, corporate executives, researchers and academic leaders, ASME’s members are as diverse as the engineering community itself. Watts DOE, FETC With the increasedemphasison the efficiency of fossil-fuel-fired, steamgenerationfacilities, the performance of ancillary equipment is becoming increasinglyimportant. The velocity is calculated by: To evaluatethe bias error associatedwith the air temperatureat the inlet: Air leaked from outside of the air heaterinto the flue gasheating the primary air.
However, using the coal feedrate,from calibrated feeders,and gas compositions as a basecreatesa commonbond betweenthe air and flue gas flows. Normally the manufacturer will supply the purchaserwith designperformancecurves or equations,but not with those to calculatethe temperaturecorrectionsspecified by the PTC. This is discussedfurther in the appendix. Help Center Find new research papers in: Similarly, the gas density is calculated: The bias errors and random errors, a, for this calculation are listed in Table A-I.
The appendix discussesthe proceduresused to determinethe individual measurementsand the uncertainty of these measurements. ASME serves this wide-ranging technical 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. For the details of the estimation of the uncertaintiesof other parameters,refer to the final Milliken project report8 Only the errors and uncertainty for theseother evaluations are presentedhere.
[PDF] ASME PTC – Free Download PDF
Theselatter temperaturecorrectionsare unique to a specific air heater. All of the other parametersare constants. Measurement Uncertain Part 1.
The uncertaintyanalysispresentedbelow contains the results for both the primary and secondarysidesof the air heater. The forms of these equationsagreewith the shapesof the curvesin Figures 2 and 3. The gas composition was determinedgenerally following the proceduresof EPA Method 3?. pfc
ASME PTC 4.3
The parametervalues used for the estimation of the uncertainty of the TCFGOT and the bias and random erroreassociatedwith them are shown below in Table I. This is achievedby evaluatingEquation 4 for the change in one parameterwhile holding the othersconstant.
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. While the Asm code is often specifiedin equipmentwarrantees,it appearsto be rarely applied. Since the parametersh and4 were evaluatedat three times the bias error, o, greater and three times the aasme error lower than the actual value of the temperatureof the inlet air, the total delta is six times a.
The determinationof the temperaturecorrectionsfor differences from design X-ratio and design flue gas flow are left to the supplier or purchaserto determine. The algorithm was of the form: Enter the email address you signed up with and we’ll email you a reset link. Register for a trial account.
The gas is qsme behave ideally and the velocity is constant over the entire cross-sectionalareaA. Calculation of the first two temperaturecorrectionsis explicitly defined by the ASME xsme. The design of the air heater was such. The bias and random errors are summedseparatelyto form the bias error statistic and the random error statistic, and then combined to estimatethe total uncertainty by: Similarly, for the deviation from the design entering flue gas temperature,the temperature correotion is: The following derivation assumesonly one test and thus representsthe maximum estimatederror.
The methods followed in deriving the estimatesof the uncertainty of the individual parametersarepublished by ASME. In operating plants, it is generally impossibleto establishdesign conditions to verify performance. Substituting Equation 8 into Equation 7 yields: Table A-I also lists the source of the bias and random errors for eachof the parameters.
Details of the air heaterperformanceand of the uncertainty analysis can be found in the referencedreports. Individual parametersrequired by the PTC 4. Remember me for one month.
In most air heaters,the majority of the air in the flue gasis leakagefrom the higher pressure, air- side of the air heater. The calculated value oftbe TCXGT from an air heaterperformancetest must be equal to or less than the design value for optimal air heaterperformance.
This createsa consistentbasis for the calculations.