1. Maximum transmission of heat with radiation

It is obvious that general feeling is not good when the temperature is 24 oC in the room and the walls are 16 oC . It is nicer when the walls are warmer (18 oC) and the air is 22 oC. It can be observed in winter too, when sense of heat is different in the shade and in the sun, although the temperature is the same. When speaking about heating, it originates from the fact that the radiant is a souce of heat. As far as efficiency is concerned we have to mention a small loss of heat after airing the room and the equality of the division of heat. Most of the radiating sources of heat are the radiating panels put on the ceiling. Other types of heating have not got enough warming surface or they cannot warm up the room entirely because of their placing.