Recently, LEWCO, Inc. delivered a 500°F enhanced duty electric walk-in oven to a world-class manufacturer of vacuum insulation panels. The application for this oven is drying compressed insulation sheets at a maximum temperature of 500°F.
The enhanced duty drying oven features a top-mounted electric heater box. A high-efficiency circulation fan delivers horizontal airflow providing uniform heat throughout the workspace. A small exhaust fan is included to discharge the moisture laden air and pull in fresh make-up air. Zero speed switches on the fans eliminates nuisance shutdowns common with differential pressure switches. A custom multi-level cart was also included for the operator to roll the parts in and out of the oven with ease. The cart was designed with enough space between the shelves to allow proper airflow for drying.
The customer required the oven to meet strict temperature uniformity requirements of +/- 10°F at an operating temperature of 500°F. A 9-pt. temperature uniformity was conducted, the results exceeded customer specifications.
Oven controls included a Eurotherm temperature controller with a redundant high-limit controller providing precise temperature control and over-temperature protection. A batch timer was included with an audible alarm to indicate a batch has finished. This system provides a simple yet reliable operating platform for the customer’s application.