Abstract:
In this research work, heat loss reduction as a result efficiency improved and also energy also save
works have been done on existing electric Mitad by redesigning components of existing system
and experimentally examined the performance .The improvement work mainly focused on major
heat loads and heat loss reduction by thermal and mechanical design alterations .Duly, physical
structure and heat flow of existing system have been modified and some changes have been made.
The Experiment was done by taking sample clay plate with diameter 27cm, thermal conductivity
0.5 W /m.k for both the upper and bottom. To minimize the initial heat up energy and time
reduction before introducing TIM the mass of the clay plate reduced from 1.578 kg to 1.358 kg as
stated the beside other factors existing system takes higher heat due to its mass . Majorly, the heat
load alteration task accomplished by replacement of gypsum insulation with high thermal
conductive graphite plate, with d=25cm, thermal conductivity 125w/ m.k which serves as thermal
interpose material /TIM also serves as heat spreader and enhancer which contributes 11% bottom
loss .Accordingly, it took grand share for efficiency improvement and bottom heat loss reduction
as well as serving as interface material for the clay plates to enable dual mode of operation. On the
other hand, the heat load of existing system identified as aluminum cover whose thermal
conductivity is 205W/m.k replaced by low thermal conductive (0.4w/m.k) bamboo plated cover
and about 17% cover loss reduced. Following to all the changes made and by experimentally
examination on both modified and existing system 55 and 47 % efficiency attained respectively
implies that 8% efficiency improvement. By the modified Injera baking Mitad the product quality
which is Injera being uncompromised from the known taste and preference with average working
temperature 200 and able to bake Injera on both sides.