Heat source for electric convection heater - uses diffuser formed from slotted strip cut along its length to permit alternate segments to be bent in opposite directions

摘要

The heat source for an electric convection heater has an enclosed electric resistance (1) and a diffuser (2) giving augmentation of the surface area exchanging heat with the air. The diffuser (2) starts as flat strip, then has slots machined at intervals along its length to further increase the available heat transfer area. The diffuser is then fitted to the resistance. The slotted diffuser strip is then cut between groups of slots to permit alternate groups of slots to be bent in opposite directions away from the vertical so as to span the greater part of the width of the convection heater enclosure, with the relative dimensions chosed to ensure mixing of hot and cold air in the region of the diffuser.