October 2022

Heat Transfer

Air-cooled heat exchanger under natural convection

Determining whether or not to operate an air-cooled heat exchanger (ACHE) under natural convection is a challenge due to the limited information available for simulations of an ACHE under operation without fans.

Pramanik, R., Contributing Consultant

Determining whether or not to operate an air-cooled heat exchanger (ACHE) under natural convection is a challenge due to the limited information available for simulations of an ACHE under operation without fans. However, to manage fan failure cases under emergency conditions—i.e., bringing the ACHEs onstream from standby condition to meet emergency cooling requirements with none of the fans operating—sometimes the use of the natural convection option becomes unavoidable. This article, with the help of case studies, will evaluate the pros and cons of both options (operating an ACHE with fans running on emergency power, and in natural convection without fans operating) to meet emergency duty c

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