Display Warming Cabinet
Our client had been using multiple rubber heaters to heat large shelves in a display warming cabinet. They needed to cost reduce this product and needed to achieve more even temperatures across the shelf surfaces.
Project and Challenges
A good deal of heat was being lost through the cabinet walls and this was the reason for the uneven shelf temperatures. Our client was assembling for heaters to each shelf in order to heat the large area.
Since the product needed to be such a small size, there was very little room for the heater. A space of 1.8" (46mm) x 7.5" (190mm) x .8" (20mm) is all that was available for a heater in the most desired product configuration. To accomodate 1400 watts @ 240 volts and squeeze in safety devices would be difficult - especially with adequate electrical spacings for CE approval.
Solutions and Their Impact
Tutco-Farnam designed a larger single-piece mica surface heater. The heater is the full size of the shelf. Our inherent heater cost is 55% less than what had been used.
The single-piece construction generated additional savings for our client since they no longer need to assemble, clamp, and wire four separate heaters.
By studying the application more carefully, we were able to profile a heat pattern which concentrates more circuit in the areas where the greatest heat loss occur. The greatest heat loss areas are the corners where structural supports conduct heat away. The edges also see heat loss. We concentrated on 70% of the circuits in these areas and have been able to improve the temperature differential from +/- 23 degrees to +/- 7 degrees.
See more custom examples like this one on the Custom Mica Surface Heaters page.
Learn more about Surface Heaters in the Engineer Talk article by Jerry Sain, Surface Heaters - an Overview.