Question

what is the direction of heat transfer?

Answer 1

The direction of heat flow in a small element within a solid only depends on the temperature of its neighboring elements. Heat within the solid will flow from hot to cold.  It will cheerfully flow downward if it is cooler down there. 

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Answer 2

The answer to the above-given question is:

• Although heat is a scalar quantity with no inherent direction, its flow profile may be predicted by determining a critical property called a temperature gradient.
• The temperature gradient is the rate of change in temperature per unit linear space.
• As a result, heat is transferred over a positive temperature gradient.
• When the temperature gradient is zero, there is no net heat flow, which is known as thermal equilibrium.