What plays a more significant role - the heat capacity of the furnace or the heat capacity of the walls?
Many opponents of frame houses believe that frame walls do not have a heat capacity, and therefore it is not comfortable to live in them. Some even argue that you can not turn off the heating in a frame house as it quickly cools down.
Based on our primitive knowledge of physical laws and life experience, we know that if we want to quickly cool a hot water bottle, we will put it in the refrigerator, not in the steam bath. If we're going to cool the tea in a thermos, the fridge will not help us until we open this thermos. The frame house can be compared with a thermos, and buildings made of brick or timber with a glass or plastic bottle. Does heat capacity play any role in this case? Even though the bottle is heated (it has accumulated heat), the water or tea in it will still cool quickly, even if it has a large heat capacity and the tea in a thermos is not. Let's talk some more ...
Imagine the stove on which you are cooking, and the pan is a house with massive heat-resistant walls. The water in the pan is the air that gives us a feeling of warmth in the home. The included stove first heats the pot, and it heats the water. Heat always goes from hot to cold. For the water to heat up, a particular time is needed, say 5 minutes.
Now, imagine that you did not put the pot on the stove but hung it at the height of one meter. How long will the water in the pan heat up? Probably a very long time, or never at all. But the pan is made of very heat-resistant metal, then why doesn't the water heat up? After all, the temperature of the plate is more than 200 ° C. The temperature of the walls of your furnace is much lower; otherwise, you would not be able to touch it. Then what is the difference between your heat-resistant walls or not?
In this situation, only the heat capacity of the furnace itself is essential, and in which house it is installed does not play a role. A warmer on the lower back will help if you are lying under a blanket (frame house) and not in knightly armor (as the home built of heat-intensive but "cold" materials).
Now, suppose your walls have really warmed above the air temperature in the room. On the street, there is frost and walls made of logs or bricks. So where will the heat go - to or from home? Remember, the above says: "Heat always goes from hot to cold." Your walls will give off heat to where it is colder and not to the house.
You will heat the street (helping global warming and energy consumption). But do not worry about this, since your walls will never heat up more than the air in the room, being at a considerable distance from the stove.
Based on Newton's cooling law, the cooling rate depends on the temperature difference and the thermal conductivity.
k is the coefficient of thermal conductivity;
T is the temperature.
Brick has a higher thermal conductivity than wood, and it has higher than any modern insulation.
Conclusion: "The heat capacity of the inner part of the wall will not bring any benefit!"
The role of the wall heat capacity when it heated by the sun
In a cold climate in winter, the sun does not warm too much, so winters are cold. But still ... The wall on the south side will heat up in short daylight hours. What then? If the walls are not insulated, such as in a log house, then the south wall accumulates a little heat. Immediately when the temperature rises, the wall begins to give off heat. Question - where? Outside, for example, -10 ° C, inside + 20 ° C. The heat will go in both directions if the wall heats up more than 20 °, but even then, more heat will go where it is colder, that is, outside. It should be borne in mind that the larger the surface area, the faster it cools. The external wall area is always larger than the internal because the house's perimeter is larger. Therefore, you should not expect that the winter sun will help reduce heating bills. If insulation is installed in the wall, the wall's heat capacity is not needed. The insulation simply does not allow heat to penetrate the house.
Conclusion: in a cold climate, the heat capacity of the walls does not play any role. Massive walls are a waste of money, and the only excuse for this can be the desire to build a house for their great-great-grandchildren, although whether they will need it, it is another article's topic.
When are heat-intensive walls needed? Indeed, sellers of aerated concrete blocks, bricks of various types, and lovers of log houses and timber houses shout about this heat capacity from all sides. They definitely heard some ringing ...
Good heat-resistant walls behave in a climate with strong temperature fluctuations during one day — it is boiling during the day and cool at night. This climate is often found in deserts or in highlands. In deserts, people often build houses from various adobe (a mixture of clay, sand, and plant mass). In the mountains, they are usually made from stone. And here and there, it is local natural cheap material. In the afternoon, the sun heats the house, the house protects the indoor air from direct heating by the sun; therefore, it is more relaxed than outdoors (although it is still hot at 40 ° C). By evening, everything was heated - both the earth and the air and walls of the house. Inside the house, the temperature is lower; remember - "From hot to cold!" Therefore, at night, the walls give off heat to the inside of the room, heating the surrounding air (and not allowing residents to relax).
If nights are cool and days are hot, then heat capacity is functional. In a cold climate, it does not play any role.
EPLAN.HOUSE
