Question

Why use parafin oil of thermocouple heating?

Answer 1

The physical and thermal properties of paraffinic oil were investigated at 250–360°C to determine its suitability for use as a heat-transfer fluid. Thermal stability test was conducted at 360°C for a period of 480 hr in a stainless steel high-pressure autoclave. The paraffinic oil offered sufficient thermal stability for a period of about 300 hr and then became unstable resulting in thermal break down or cracking of the oil. Degradation of the oil led to the formation of gases, liquid components, and solid coke of about 5 wt.% of the starting material. The distillation test performed on the liquid components showed that the composition varied from light naphtha to heavy bituminous material.

Hope this helps you. .
@KHUSHALI. .

Answer 2

Paraffin was used as phase change material and water was used as heat transfer fluid ... by researchers, sensible heat storage materials such as rocks, oil etc. were used.