Why fireplaces were used in European castles and palaces, not stoves

Everyone is familiar with the images and photographs of European palaces and castles, where a fireplace was always located as a source of heat in large halls:

Winters are short and warm in Europe. And heat sources are needed for a short time. But why exactly a fireplace and not a stove (heat accumulator). After all, the fireplace burned out and that's it, it became cold again. It is more of a decorative structure in our time (a beautiful kind of fire). But it's not that simple.

The stove can maintain a comfortable temperature after heating in a limited space. She has the power to give off heat. And for such large rooms you need several stoves. But what about fireplaces, are they really more effective? The fact is that the stove, as a heat accumulator, heats the room with convection heat and a little radiation, and the fireplace - almost completely with IR radiation. The higher the combustion temperature (~ 600-1200 gr. on fire) - the more powerful the flow of IR heat. Those. fireplaces had a bonfire effect, heating objects in the area of ​​radiation from the fire.

But I do not rule out that air registers from the fireplace are laid inside the stone or brickwork of palaces and castles. For example, as a modern fireplace heating scheme:

And while someone was sitting in the hall, other rooms of the palace were heated with warm air. I have not seen any reports of studies of the walls of palaces and castles. Although, I came across photographs with voids in the walls of palaces of the 18-19 centuries, built in Russia, which were used in the air heating system.

There is one more question: the fireplace is burnt out, it's time to go to bed. What to do, constantly get up and put firewood on (assuming that there were air ducts in the sleeping quarters)? It was much colder in the sleeping places. Sometimes a sleeping place was arranged immediately in a hall with a fireplace. And they did this:

The wealthy had four-poster beds. At night, the curtains of dense fabric were lowered and the temperature rose inside from the breath and body heat. If two people - the air warmed up even faster. Those. this is a purely practical purpose, not a decoration.

Another medieval tradition that persisted even in the middle of the 19th century. - this is a sleeping place in the closet:

This was done to better retain heat from the body and breathing. Localized space, almost all the heat from the body and breath remained inside. Yes, the CO2 content increased and it became more difficult to breathe. Perhaps it was a matter of habit.

I have come across information that with an increase in the concentration of CO2 in the air, the level of oxygen assimilation by the blood also increases. Such a paradox. It turns out that red blood cells assimilate only 30% of oxygen under normal conditions from the inhaled air.

Many athletes use hypoxic masks to train the body. But it is possible that they themselves do not know that thanks to such masks the level of oxygen assimilation increases and metabolic processes, strength and endurance increase.

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Photos are taken from open sources, from Yandex. Pictures

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