D12 Electric Heating and Radiant Glass Panel

Topic

An electric heating panel—including a glass radiant panel—converts virtually all the electrical energy it consumes into heat, with no significant loss during the process. This clearly distinguishes it from the heat pump described in the energy and efficiency module, which transfers multiple units of heat for every unit of electricity consumed; an electric panel, by contrast, delivers at most the same amount of heat as the electricity it consumes—never more.

Its distinctive advantage lies not in conversion efficiency, but in the way it delivers heat: the panel's surface reaches a temperature considerably higher than that of the ambient air. At this temperature, it emits a significant portion of its heat as direct infrared radiation toward people and surrounding surfaces—much like the sun, which heats directly without needing to warm the intervening air first. This radiant heat allows people to feel comfortable even when the ambient air is cooler than usual, as the "operative temperature" (a concept introduced in the thermal comfort module) compensates for the air temperature difference through the radiant heat received directly.

Due to its simplicity and rapid response, this type of heating is particularly well-suited for spaces used intermittently, such as bathrooms. However, for the continuous heating of an entire space, a heat pump is generally more efficient in terms of total electricity consumption.

Thus, this module—which began by explaining how electricity is converted into heat without loss or gain—concludes by showing that the choice between an electric panel and a heat pump depends not on which converts electricity more efficiently, but on whether the space is used intermittently or continuously.

ID:4042