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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Are you sure you want to empty the cart? For application of Equation 1, two additional, independenttemperaturecorrectionsare required.


In the caseof the Milliken study, the correlation equationsagreedwith results from the plots within the ability to read the plots. Equation 17 is then usedto estimatethe overall uncertainty interval. Instead,performanceindicators such asthe measuredeffectivenessof the air- and gas-sidesand the X-ratio are compareddirectly againstdesign values. Each air heater heats both primary and secondaryair for half of the unit in separatesectionswith the flue gas mixed before and after the tir heater.

Since the parametersh and4 were evaluatedat three times the bias error, o, greater and three times the bias error lower than the actual value of the temperatureof the inlet air, the total delta is six times a.

Background As part of the I-J. CO 20 mm 10Ppm Same co, 0. This expansion is used to evaluatethe bias and random error contributions separately.

The bias errors and random errors, a, for this calculation are listed in Table A-I. Measurement Uncertain Part 1.

Moreover, air inlcak makesit difftcult to determinethe exiting flue gas temperature and the performance 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. 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: However, this derivation will be general.


Individual parametersrequired by the PTC 4. Biasesare associated with the measuring equipment or procedureand cannot be minimized by repeatmeasurements. About ASME ASME is a not-for-profit membership organization that enables collaboration, knowledge sharing, career enrichment, and skills development across all engineering disciplines, toward a goal of helping the global engineering community develop solutions to benefit lives and livelihoods. Note that using a single thermocoupleto measureall of the temperaturesin the traverseof a plane in a duct createsa dependencybetweenthese measurements.

Theselatter temperaturecorrectionsare unique to a specific air heater.

Asme Ptc Air Heaters Bw () – Free Download PDF

However, using the coal feedrate,from calibrated feeders,and gas compositions as a basecreatesa commonbond betweenthe air and flue gas flows. Background Error propagation is calculatedby Taylor Seriesexpansionof the resultant function. The bias and random errors are propagatedseparatelyusing Taylor seriesexpansionsfor highly nonlinear equations: The averageis basedon a traverseof an inlet or outlet duct. The bias error pc tbe thermocoupleis the samefor all points.

Table A-I also lists the source of the bias and random errors for eachof the parameters. However, if the terms are correlatable,that is, not independent,then the sum of the crossproducts aame Equation 16 is not zero and theseterms must be included in the estimate. In the caseof Equation 15, the air leak introduces a significant non-linearity which invalidates this approach.

Enter your account email address to request a password reset: In the caseof the bias error, the crossproduct telms accountfor essentially all of the error in determining the averagetemperature.

ASME PTC Air Heaters, –

Enter your personal account email address to request a password reset: 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. Click here to sign up. Calculation of the first two temperaturecorrectionsis explicitly defined by the ASME code.


The air heater is a souteeof lost thermal efficiency in two ways — air leakageinto flue gas side andpoor heat recovery. If these temperaturecorrectionsarenot provided by the equipment manufacturer as algorithms or plotsthey can be estimatedby the procedurepresentedin this paper.

This is achievedby evaluatingEquation 4 for the change in one parameterwhile holding the othersconstant. There were no books found for the applied search filters. The bias error is responsiblefor the majority of the uncertainty evenwith only a four-point traverse.

As previously mentioned, many of the crossproduct terms must be included in the bias calculationssince the sameequipment was usedto measurea parameter. Becauseof the non-linearity of the final equation, numerical approximationswete usedto determinethe differentials neededfor the propagation procedure.

Please login to your authorized staff account to use this feature. Thus, they apply to any air heater. For the deviation from the design entering air temperature,rclJM,this is: For many of the parametersexamined in this work, the parameterswere a independentand all of the terms in Equation Al were evaluated. An air heater is shown schematicallyin Figure I.

Similarly, for the deviation from the design entering flue gas temperature,the temperature correotion is: CommentsI Basis llmension Width 0. Details of the air heaterperformanceand of the uncertainty analysis can be found in the referencedreports. Repetitive measurementstend to reducethe random error.

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