Abstract

This chapter characterizes the dynamic behavior of a counterflow heat exchanger. It establishes the fact that transient variations will be encountered during operation of heat exchangers. These transient variations set up dynamic changes that alter the thermal performance of the heat exchanger. Hence, it is imperative to characterize the dynamic behavior of the heat exchanger when exposed to these transient variation conditions. Transient effectiveness methodologies comprised of analytical and experimental studies of transient effectiveness models were chosen to investigate the characteristics of a counterflow heat exchanger under mass flow rate and temperature variations of hot fluid flow. Results of both analytical and experimental approaches agree that transient variations in the inlet mass flow rate and temperature of the hot fluid alter both the unsteady and steady-state conditions of the heat exchanger.

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