ASME PTC 30 1991 R2016
$98.04
ASME PTC 30 – 1991: Air Cooled Heat Exchangers (ACHE) – Reapproved 2016
| Published By | Publication Date | Number of Pages |
| ASME | 1991 | 100 |
This Code provides uniform methods and procedures for testing the thermodynamic and fluid mechanical performance of air cooled heat exchangers, and for calculating adjustments to the test results to design conditions for comparison with the guarantee. The scope of this Code covers, but is not limited to, the testing of mechanical draft heat exchangers, of both the forced draft and induced draft types, natural draft heat exchangers, and fan assisted natural draft heat exchangers. From a heat transfer surface standpoint, this Code covers all tube bundle orientations, including: vertical, horizontal, and slanted conduit heat exchangers. Both bare surfaces and finned surfaces are included as conduit type heat exchanger components. While conventional round tubes with circular fins are assumed in this Code, the procedures can be modified by mutual agreement to apply to other surface configurations. While the cooling fluid is restricted to atmospheric air, the tube-side fluid can be any chemical element, compound or mixture, in single phase flow, liquid or gas, or in two phase flow. This Code is written under the assumption that the Air Cooled Heat Exchanger (ACHE) may be tested as having a discrete process stream or that only one process fluid stream is being investigated. In other cases, modifications must be made to the procedures presented. Such modifications shall be agreed by the parties to the test. The scope of this Code also includes, directly or by reference, recommended methods for obtaining data, measurements, observations, and samples to determine the following: (a) Physical Dimensions (b) Air Flow Rate (c) Air-Side Pressure Differential (d) Fan Driver Power (e) Sound Level (f) Atmospheric Pressure (g) Environmental Effects (h) Wind Velocity (i) Air Temperatures (j) Entering Air Temperature (k) Exit Air Temperature (l) Process Fluid Temperatures (m) Process Fluid Pressures (n) Process Fluid Flow Rate (o) Composition of Process Fluid (p) Percent capability (q) Process Fluid Pressure Drop. Publisher: ASME
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 7 | Committee Roster |
| 9 | CONTENTS |
| 13 | 0 INTRODUCTION |
| 15 | 1Object And Scope 1.1 Object 1.2 Scope 1.3 Uncertainty |
| 17 | 2 Definitionsand Description of Terms 2.1 Terms |
| 20 | 2.2 Letter Symbols |
| 23 | 3 Guiding Principles 3.1 General 3.2 Agreements Prior to Test 3.3 Selection of Personnel 3.4 Pre-Test Uncertainty Analysis 3.5 Arrangement of Test Apparatus |
| 24 | 3.6 Methods of Operation During Testing 3.7 Provisions for Equipment Inspection 3.8 Calibration of Instruments 3.9 Preliminary Testing |
| 25 | 3.10 Conduct of Test 3.11 Permissible and Nonpermissible Adjustments to Test Procedures 3.12 Duration of Test 3.13 Number of Test Readings 3.14 Permissible Limits of Test Parameters |
| 26 | 3.15 Degree of Constancy of Test Conditions 3.16 Causes for Rejection of Test Readings or Results 3.17 Post-testuncertainty Analysis |
| 27 | 4 Instruments and Methods of Measurement 4.1 GENERAL 4.2 Measurement of Physical Dimensions 4.3 Fan Measurements 4.4 Measurement of Air Flow |
| 28 | Figures 4.1 Location of Air Velocity and Temperature Measurement Points Across Fan Ring |
| 29 | 4.5 Measurement Of Air-Side Pressure Differential Tables 4.1 Recommended Minimum Number of Air Velocity Measurement Points for Fan Ring Traverse |
| 30 | 4.6 Measurement of Fan Driver Power 4.2 Typical Velocity Distribution Across Fan Stack |
| 31 | 4.7 Measurement of Sound Level 4.8 Measurement of Atmospheric Pressure 4.9 Measurement of Environmental Effects 4.10 Measurement of Wind Velocity 4.11 Measurement of Air Temperatures |
| 32 | 4.12 Measurement of Ambientand Entering Air Temperatures 4.13 Measurement of Exit Air Temperature 4.14 Measurement of Process Fluid Temperatures 4.15 Measurement of Process Fluid Pressures |
| 33 | 4.16 Measurement of Process Fluid Flow Rate 4.17 Measurement of composition of Process Fluid |
| 35 | 5 Computation of Results 5.1 General 5.2 Review of Test Data and Test Conditions 5.3 Reduction of Test Data |
| 36 | 5.4 Determination of Material and Heat Balances |
| 37 | 5.5 Computation of Effective Mean Temperature Difference 5.6 Computation of Overall Heat Transfer Coefficient |
| 38 | 5.7 Determination of Air-Side Pressure Losses 5.8 Determination of Process Fluid Pressure Losses |
| 40 | 5.9 Adjustments of Test Data to Design Conditions |
| 43 | 5.1 Values of Ftr for EQ. (5.38) |
| 45 | 5.1 MeanTemperature Difference Relationships – Crossflow Unit – 1 Tube Row, Unmixed |
| 46 | 5.2 Mean Temperature Difference Relationships Crossflow Unit – 2 Tube Rows, 1 Pass, Unmixed |
| 47 | 5.3 Mean Temperature Difference Relationships Crossflow Unit – 3 Tube Rows, 1 Pass, Unmixed |
| 48 | 5.4 Mean Temperature Difference Relationships Crossflow Unit – 4 Tube Rows, 1 Pass, Unmixed |
| 49 | 5.5 Mean Temperature Difference Relationships Crossflow Unit – 2 Tube Rows, 2 Passes, Unmixed Between Passes |
| 50 | 5.6 Mean Temperature Difference Relationships Crossflow Unit – 3 Tube Rows, 3 Passes,Unmixed Between Passes |
| 51 | 5.7 Mean Temperature Difference Relationships Crossflow Unit – 4 Tube Rows, 4 Passes, Unmixed Between Passes |
| 52 | 5.8 Mean Temperature Difference Relationships Crossflow Unit – 4 Tube Rows in 2 Passes, 2 Tube Rows Per Pass, Mixed at t |
| 53 | 5.9 Schematic Of Process Fluid Piping |
| 54 | 5.10 Fin Efficiency of Several Types of Straight Fins |
| 55 | 5.11 Efficiency Curves for Four Types of Spine Fins |
| 56 | 5.12 Efficiency of Annular Fins of Constant Thickness |
| 57 | 5.13 Efficiency of Annular Fins With Constant Metal Area for Heatflow |
| 59 | 6 Report of Results 6.1 Composition of Report |
| 60 | 6.2 Report Data |
| 61 | Appendices A – Testing Guidelines |
| 63 | B – Example |
| 69 | C – Example Uncertainty Analysis |
| 72 | Tables C.1a Sensitivity Factors for Uncertainty Analysis |
| 73 | C.1b Sensitivity Factors for Uncertainty Analysis |
| 74 | C.2 Error Estimate Values for Capability |
| 75 | C.3 Error Estimate Values for Capability |
| 76 | C.4 Two-tailed STUDENT-t Table for The 95 Percent Confidence Level |
| 77 | D – Special Considerations for Computation and Adjustment of Results |
| 78 | Figures D.1 Moody-darcy Friction Factor Chart for Flow Through Plain Tubes |
| 81 | D.2a Chart for Calculating In-Tube Heat Transfer Coefficients for Water |
| 82 | D.2b Correction Factor To Fig. D.2a For Other Tube Diameters |
| 84 | D.3 Two-phase Flow Friction Pressure Drop Correction Factor |
| 85 | D.4 B A Function for wm for Thechaddock Method |
| 86 | D.5 Colburn Correlation for Condensation on a Vertical Surface – No Vapor Shear |
| 89 | E – Fouling |
| 91 | F – Recirculation of Air |
| 93 | G – References |
