When the cold winter comes, the outside drips into ice, people can keep warm in a variety of ways, we can wear down jackets, use heating and air conditioning to keep warm, in the era of no electricity and heat technology, how did the ancients come to keep warm from the cold?
In ancient times, people had different ways of heating, and burning wood for heating was a primitive and direct and effective method. In ancient times, tinder was kept for cooking, cooking delicious food, and keeping warm from the cold.
Later, people used braziers for heating, some relied on stove ash for heating, and some families would use clay pots to hold flames for heating. Later, this method evolved into a fire pond, also known as a fire kang. In the north, people usually have ondols in their homes, which are equipped with holes inside, and the air in the channels is heated by the heat generated by combustion.
Some people use a copper hand stove or foot stove for heating, a small stove with a delicate and varied shape, in which you can place charcoal or ashes with residual heat, and you can add a cover.
Some can even put a hand stove inside their sleeves to warm their hands, which is also called a "hand warmer" or "fire cage". In the imperial court, copper smokers, which were elaborate vessels made of clay or copper and iron, were used for indoor heating. The heating of the palace is to build the walls of the palace into a hollow "sandwich wall", commonly known as the "wall of fire". It makes the whole palace feel warm like spring.
Nowadays, in the winter in the north of our country, due to the unusually cold temperature, we all need to rely on heating for heating. In a heated room, the location of the heating is under the window, the cold air mainly enters the room through the window crack, the radiator is installed under the window, the cold air is heated immediately after entering, it is transformed into hot air and rises, and then the heat is spread along the ceiling, making the room quickly warm.
If the radiator is installed away from the window, the cold air will enter the room directly and cause the room to get colder and take longer to warm up.
Although the heating in the north is called "heating", it does not work on the inner part of the gas, but hot water that has been softened. The circulating medium in this heating system can be said to be the "porter" of heat, transferring the heat from the heat source to the home.
District heating people take advantage of the high specific heat capacity of water to achieve heat transfer, such as water and kerosene, assuming that their temperature is raised from normal temperature to 25. Although they heat up at the same temperature, in order to reach 25 , the water needs to absorb more heat during heating.
But when transmitted to a user's home far from the heat source, the advantages of water are obvious, with its ability to release twice as much heat as kerosene, and water can be seen as a substance capable of carrying more heat.
Water can be used not only to heat objects but also to lower the temperature of objects. For example, the engine is cooled by a water cooling system, and a coolant pipe is set up outside the cylinder of the engine, and water is used as the heat transfer medium to take away the heat of the high-temperature parts.
Due to the large specific heat capacity of water, it is able to absorb more heat than other media, ensuring the stable operation of the engine for a long time. Whether it is using water to heat the environment or using water to reduce the ambient temperature, it is the high specific heat capacity of water that is used.
Under the same heating or cooling conditions, the temperature change of water is more stable, such as the sand and sea water on the beach receive the same amount of sunlight during the day, and the temperature of the sea rises relatively less when the same heat is absorbed.
At the same time, the temperature of the surrounding air does not drop too much, and the temperature changes less in a day, because the specific heat capacity of the sea water is larger, the temperature changes relatively slowly, and it feels cooler, while the sand becomes hot and unbearable, so it can be said that the water is like a thermostat that can keep the temperature fluctuations on the seaside within a small range.
In the inland areas, the temperature varies greatly, with the inland areas being hotter in summer than the coastal areas and the inland areas being colder than the coastal areas in the winter. Especially in the desert, due to the small specific heat capacity of the sand, when absorbing or releasing the same heat, the temperature change will be very obvious, and the temperature change in the day is very drastic, and there will be a situation of "wearing a cotton jacket in the morning and yarn in the afternoon".