New performance-evaluation analyses on heat transfer surfaces by single-blow technique

Abstract

This paper presents a method which can consider the space dependence of the heat transfer coefficient of heat exchanger units or surfaces in evaluating heat transfer performance of a system by a single-blow technique. The performance-evaluation analysis is conducted in the Laplace transformed domain. Cubic spline polynomials are employed to fit the measured inlet and exit fluid temperatures. Also the conventional analysis method is improved through a modified mathematical modelling for a better accuracy. The methods are applied to evaluate the heat transfer performance in stationary and rotating parallel-disk assemblies.