To improve the heating efficiency, make a groove with insulation and place the object to be heated inside the groove.
This figure shows the case where the object to be heated is small and equal to or smaller than the condensing diameter (width) of the halogen heater.
Make a groove in a simple way and place the object to be heated inside the groove.
The heating target of groove heating is heated with three elements.
1. Direct heating from heat source
2. Reflective heating from the wall,
3. Radiant heating which is heated by the reflected light and radiated from there
Preventing adverse effects of updraft
In open heating, the air around the object to be heated is also heated and thermally expanded and lightened, so an updraft is generated.
Air at normal temperature and normal pressure flows into the space that has become lean and low pressure due to the updraft.
This inflowing air is not good for heating work because it contacts and cools the heating object.
Groove heating does not generate a flow of cooling air, creating an effective heating environment.
Verification of rereflection heating method-Difference between flat surface heating and groove heating
If inert gas is flowed into the groove, oxidation-free or low-oxidation processing can be performed.
Covering the top of the groove with quartz glass will make it more perfect.
Comparison of open irradiation and groove heating
Taking HPH-60/f30/36v-450w with a focal length of 30 mm with a Φ60 condenser mirror as an example,
As the rated focal diameter is φ8, it is suitable for groove heating.
The time to reach 800℃ can be reached within 20 seconds with groove heating but not with 40 seconds with open heating.
Elongation at high temperature area is different when retroreflective heating light is used.
Related page:
6-4.Re-reflective heating method – Frame heating 
6-5.Re-reflective heating method – Dome heating 
6-6.Re-reflective heating method – Box heating 
6-2.Re-reflective heating method – Large condense mirror 
6-1.About Re-reflective Heating Method 
Verification of rereflection heating method-Difference between flat surface heating and groove heating 
2-4.Focal Length and Focal Diameter of Halogen Point Heater 
5-4.Proper use of near-infrared heating and far-infrared heating