Heat is useful as It IS our main heat source keeps us warm and help us in our daily lifes. Solar Panels are used to trap Heat
That would be "heat", except that sometimes heat can be quite useful.
what is the differnence between gross calorific value and useful heat value
They both burn easily with lots of heat.
They both burn easily with lots of heat.
Infrared is heat and during the day other objects are hot besides bodies
That would be "heat", except that sometimes heat can be quite useful.
It is useful to heat materials when attempting to change their physical properties, such as melting or shaping. However, it may not be useful to heat materials that are sensitive to heat and may degrade or become damaged, or when temperature control is crucial for the material's stability.
what is the differnence between gross calorific value and useful heat value
Yes - with certain limitations. You can convert part of the heat - not all of the heat - into useful work, if there is a heat difference. The remainder of the heat (from the hot container) gets passed to the cold container. You CANNOT convert ALL the heat into useful work, nor can you convert heat into useful work if there is no heat difference. All this would contradict the Second Law of Thermodynamics, and it is very unlikely that this law will ever be violated.
When you want heat and grip.
When coal is burnt, the energy lost in the form of heat and pollutants such as carbon dioxide and ash is considered as not useful energy. This includes waste heat that is not converted into useful work or electricity.
heat
heat energy
Heat conduction and heat tolerance.
The useful energy that comes out of a light bulb is primarily in the form of light and heat. The electrical energy is converted into light energy that illuminates the surroundings and heat energy that warms up the light bulb and its surroundings.
No, heat energy is not always useful. In some situations, like in the case of unwanted heat in electronics causing overheating, heat energy can be detrimental. However, in many cases, heat energy is harnessed for various purposes such as cooking, heating buildings, and generating electricity.
By burning it, which produces heat