JingHan Heating Course -3 The reason and results of "Heating temperature gradient"

The phenomenon of temperature gradient is caused by the fact that indoor air molecules have thermal energy during the heating process of radiator, the relative density decreases, the unit volume mass becomes lighter, and the "hot air upward floating phenomenon" is generated by the buoyancy effect of the surrounding cold air. It can cause a heating problem in a heating room where the ceiling temperature is high and the floor temperature is low, and the heating is not up to the requirements.

 

A radiator is a device that heats air by natural convection. 

 

More than 60% of the heat of the radiator is generated by air convection, and this convective heat exchange process is the main cause of the "temperature gradient”. In addition, about 35% of the heat is transferred outward by means of radiation, which is accepted by the surrounding objects in the process of radiation. This energy is useful work heating. Another 3% is lost through heat conduction, which also heats the surrounding air, creating a new "temperature gradient" that flows upward.

 

 

The result of heating "temperature gradient"

 

As a result of the "temperature gradient" phenomenon, the new "chimney effect" will be accelerated followed by. The generation of the chimney effect enhances the indoor air convection speed, leading to the hot air will be transferred to the outdoor due to the building "cracks", resulting in more energy waste. The indoor heating temperature is balanced and stable, which will reduce the indoor air convection and reduce the chimney effect in the environment without temperature gradient. 

 

That shows that the heating temperature gradient has an obvious influence on the heating effect of buildings. The temperature of the heating ground area is not up to the standard, and at the same time, the heating energy is wasted.