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Author of several well-received Process Engineering Guides in Heat Transfer, Peter Hills brings more than 25 years of experience in a variety of thermal applications. The book provides a practical insight into the design, operations, specification, and purchasing of heat transfer equipment. The engineer is led through logical understanding of all processes involved and taught to distinguish the practical applications from the computer codes. Covers a wide and detailed variety of process and power equipment.
340 pages, © 2005
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Table of contents: |
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CHAPTER 8 - AIR COOLED HEAT EXCHANGERS |
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8.2 DESCRIPTION AND TERMINOLOGY |
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8.3 SUITABILITY FOR AIR COOLING |
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| 8.3.1 Options Available for Cooling |
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| 8.3.1.2 Direct contact cooling |
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| 8.3.1.3 Use of raw water on a ‘once through’ basis |
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| 8.3.1.4 Indirect cooling with a secondary coolant |
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| 8.3.1.5 Cooling water from an evaporative cooling tower |
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| 8.3.1.6 Cooling water from a dry cooling tower |
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| 8.3.1.7 Cooling water from an air cooled heat exchanger |
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| 8.3.1.8 Direct cooling in an air cooled heat exchanger |
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| 8.3.2 Choice of Cooling System |
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| 8.3.2.2 Process considerations |
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| 8.3.2.6 Ambient conditions |
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8.4 SPECIFICATION OF AN AIR COOLED HEAT EXCHANGER |
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| 8.4.2 Thermal Duty and Design Margins |
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| 8.4.3 Process Pressure Drop |
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| 8.4.4 Design Ambient Conditions |
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| 8.4.4.1 Dry bulb air temperature |
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| 8.4.5 Process Physical Properties |
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| 8.4.6 Mechanical Design Constraints |
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| 8.4.6.1 Standard specifications |
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| 8.4.6.2 Materials of construction |
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| 8.4.6.4 Tubing dimensions |
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| 8.4.6.5 Temperature limitations |
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| 8.4.6.6 Airside design clearances |
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| 8.4.6.8 Fan characteristics |
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| 8.4.9 Economic Factors in Design |
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| 8.5.1 Control of the Process Fluid |
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| 8.5.2 Control of the Air Flowrate |
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| 8.5.2.1 Changing motor speeds |
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| 8.5.2.2 Changing fan blade pitch angle |
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| 8.5.3 Control of Air Temperature |
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| 8.5.4 Effect of Weather on ACHE Control |
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| 8.5.6 Natural Convection Performance |
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| 8.6.1 Assessment of Whether Relief is Necessary |
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| 8.6.2 Estimation of Heat Input |
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| 8.6.3 Estimation of the Potential Required Relief Rate |
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| 8.6.4 If necessary consider means of reducing the heat input |
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| 8.7.2 Manual Checking of Designs |
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| 8.7.2.1 Mean temperature difference |
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| 8.7.2.2 Heat transfer rate |
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| 8.7.2.3 Process pressure drop |
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| 8.7.3 Computer Assessment |
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| 8.7.3.2 Process flow distribution |
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| 8.7.3.3 Air flow distribution |
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8.8 FOULING AND CORROSION |
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| 8.8.2.2 Protective coatings |
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| 8.8.2.3 Sacrificial tubes |
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| 8.9.2 Preparation for Performance Measurements |
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| 8.9.4 Process Flow Distribution |
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| 8.9.5 Air Side Measurements |
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| 8.9.5.3 Pressure measurements |
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| 8.10.2 Methods of Cleaning |
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| 8.10.4 Preferred Contractors |
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8.11 MECHANICAL MAINTENANCE |
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APPENDIX A8 - Preliminary Estimation of ACHE Size and Cost |
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| A8.1.1 Linear Heat Release Curves |
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| A8.1.2 Non-linear Heat Release Curves |
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| A8.1.3 Correction Factors |
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| A8.2 Limitations and Accuracy |
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SYMBOLS USED IN CHAPTER 8 |
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