Transcription of TheBasicsof AIR-COOLEDHEATEXCHANGERS - Chart …
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TheBasicsof AIR-COOLEDHEATEXCHANGERS - Chart …
The Basics of AIR-COOLED HEAT EXCHANGERS. HUDSON. Products Corporation A Subsidiary of Hudson Products Holdings, Inc. CONTENTS. Page FOREWORD ..i NOMENCLATURE ..ii I. DESCRIPTION OF AIR-COOLED HEAT EXCHANGERS ..1. Components ..1. Tube Bundle ..1. Axial Flow Fans ..5. Plenum ..6. Mechanical Equipment ..6. Structure ..6. Comparison of Induced and Forced Units ..7. Induced Draft ..7. Forced Draft ..7. II. THERMAL DESIGN ..8. Typical Heat Transfer Case I ..13. Application of Design Method ..19. Sample Problem ..20. Fan Selection Horsepower Requirements ..21. III. PERFORMANCE CONTROL OF ACHEs ..21. Varying Air Flow ..23. Extreme Case Controls ..23. Internal Recirculation ..23. External Recirculation ..23. Co-current Flow ..23. Auxiliary Heating Coils Steam or Glycol.
LMTD = log mean temperature difference °F M=mass flow rate lb/hr mw = minimum wall thickness in n=tubes per row, per foot of exchanger width l/ft N=rows of tubes in direction of air flow Dimensionless NRe = Reynolds Number Dimensionless Ntu = number of heat transfer units Dimensionless OD = outside diameter of tube ft
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