Abstract

The production of heat exchanger coils involves the brazing of return tubes and hairpins to complete the refrigeration circuit. The knowledge of the temperature distribution within an autobrazer is essential for the control of process variables such as burner alignment, gas/flux mixture and conveyor speed. This paper presents the design of a mobile temperature monitor system to measure temperature distributions for the proces s control of an autobrazer. The physical characteristics of the monitoring system in the area of temperature transducer locations simulate closely the actual characteristics of the brazing process. By comparing a measured temperature distribution with a known optimal distribution, the process variables can be adjusted either manually or automatically to affect the process for maximum brazing efficiency. Presently, process variables are adjusted manually and often these adjustments are not repeatable, resulting in high percentage of production coil rejects and subsequent rework.

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