People who engage in geological exploration often have to live in their fellow villagers' homes, so Su Hao is not unfamiliar with farming affairs. In his impression, in the early years, the southern rural areas burned straw in the fields as fuel. Later, the economy developed, and more and more people could afford coal and even liquefied gas, so the situation of burning straw gradually decreased.

In this home, he clearly saw that Yang Gendi used straw when burning fire. Why did Lu Xiuer even pick up firewood?

Seeing that his son looked confused, Yang Gendi had to explain helplessly: "Of course cooking is to burn grass, but the grass is not enough to burn. The straw collected from the fields is enough to burn for half a year. How can I burn it if I don't pick firewood? All the families in this village are like this. Last year, Xiu'er was bitten by a snake to pick firewood. Don't you remember?"

"Well, it seems like this is happening." Su Hao nodded. In the past, the scholar Su Hao lived in his scriptures all day long. Although he knew about the fact that his sister and fiancée were bitten by a snake, he had no reaction. He only helped several neighbors and sent Lu Xiu'er to nearby Shitan Town to invite the doctor to see it, which saved his life.

"Why don't you go to Wenshu?" Yang Gendi was quite surprised when she saw her son looking around and asking questions. In the past, her son never cared about family affairs. Unless he wanted to find something to eat, he would never step into the kitchen. Why did he suddenly become interested in these things today?

Su Hao smiled at his mother, but didn't explain anything, just said, "Mom, I'll help you burn the fire."

"You can burn the fire?" Yang Gendi's eyes widened. In her memory, her son seemed to have never burned the fire at all. Without her and Lu Xiu'er busy, Su Hao would never take the initiative to say a word to help.

Su Hao walked to the stove, sat on the small stool burning fire, picked up a handful of dried straw, and made it by hand to let the straw spread a little, and then stuffed it into the furnace.

Yang Gendi stood aside and asked in surprise: "Haoer, when did you learn to burn fire?"

"Does it also need to be learned to burn fire?" Su Hao asked back.

In fact, it still requires some skills to burn rural earth stoves. First, the straw cannot be held in a bunch and stuffed into the furnace to burn, because it is not easy to burn thoroughly. Secondly, when stuffing straw into the furnace, you must first stuff it in a little, and then stuff the back into it after it is finished. If you don’t understand these techniques, just stuff the straw into it very stiffly, and the fire in the furnace will be dispersed and may even extinguish the fire.

Su Hao's skills were developed by him after burning fires countless times in a farmhouse in his previous life. How could he explain it to Yang Gendi clearly?

"My son is just smart and can do anything at a glance. When Xiu'er first helped me burn fire, she was not as good as you." Yang Gendi said with relief as she looked at her son's skillful movements.

"Mom, I understand, our stove is not good, this is the reason why our straw is not enough to burn enough." Su Hao sat down to burn the fire, not only to help Yang Gendi do some work. When he was standing there just now, he had already looked at the stove at home. He found that the stove was designed very unreasonable. After trying to burn a few handfuls of straw, he became more confident in his judgment. He knew that this was the main reason why the straw is not enough to burn enough at home.

Yang Gendi disagreed, and said, "Haoer, what were you talking about? This stove was specially invited by your grandfather to make a special cook at Shitan Town when he was alive. In the village, except for the family members, we can count our stoves."

The word doctor is used locally to refer to carpenters. However, if other craftsmen are skilled, people will call him a doctor, but they only need to add a prefix to represent their profession. The mud doctor Yang Gendi mentioned is a relatively famous bricklayer in the town. There are many tricks in making stoves. The stoves made by professional bricklayers are indeed much better than those built by their own casually.

But this eye was rated as the second-ranked stove in the village by Yang Gendi, but in Su Hao's eyes, it was full of flaws.

First of all, the furnace wall of this stove is too thin to play a role in insulation. Only a small part of the heat generated by the combustion of the furnace fuel is absorbed by the pot mounted on it, and most of it is radiated through the furnace wall, which leads to a huge waste of energy.

Secondly, the furnace is designed too small and the position of the flue is also problematic, resulting in poor air circulation in the furnace. In this way, the fuel in the furnace is insufficient, and the furnace is prone to black smoke. These are actually carbon particles that are not fully burned.

Also, too large the stove mouth can also lead to heat loss; the chimney on the roof is definitely not high enough, and it cannot have the effect of inhalation, which is one of the reasons why the air in the furnace does not circulate.

Su Hao can see that these problems are not without reasons. In his previous life, he once came into contact with a design called "Free Firewood Stove", and the above are the key points.

Speaking of provincial firewood stoves, this is actually a great achievement of the Ministry of Agriculture of the Republic. In the 1980s, the Ministry of Agriculture launched a project to promote provincial firewood stoves. Over the past 10 years, it sponsored 100 counties every year and promoted provincial firewood stoves in rural areas. In 10 years, this project covered a total of 1,000 counties across the country.

Most of the stoves used in rural China for thousands of years have defects such as Su Hao's stove, which leads to extremely low thermal efficiency of the stove, with an average of less than 10%, which is also the main reason why the fuel is not enough in many rural areas of China. The firewood-saving stove promoted by the Ministry of Agriculture was jointly developed by a series of experts. It has a simple structure and requires almost no additional investment, but it can increase the thermal efficiency of the stove to more than 25%.

Farmers can save more than 60% of straw by using firewood stoves, and basically no longer have to cut firewood, which is of great benefit to rural soil and water conservation.

Not only that, due to the improvement of thermal efficiency, greenhouse gas emissions have been greatly reduced. In later generations, the United Nations once studied China's experience in promoting provincial firewood stoves and regarded it as a very great undertaking.

Su Hao was a person who liked to learn new things in his previous life. When he was in the countryside, he had learned relevant knowledge from technicians who promoted provincial firewood stoves. Now, when he looked at his own stove, he naturally understood the problem.

Su Hao naturally could not explain this knowledge to Yang Gendi. With his understanding of Yang Gendi, he knew that if he proposed to give him a new stove at home, Yang Gendi would definitely oppose it. This included distrust of his skills, feeling sorry for him and not willing to let him work.

After thinking through this, Su Hao stopped talking. While burning the fire, he chatted with Yang Gendi about some leisure time. The mother and son were talking and laughing, and they were happy.

When Lu Xiu'er picked up the firewood, Yang Gendi had already prepared the rice, served it in three large sea bowls, and placed it on the Eight Immortals table in the main hall, a family of three, each with a bowl. As for the dishes to serve, there were a small plate of bean stew and two pieces of moldy tofu.

"Eat quickly, didn't you say you were hungry?" Yang Gendi said to Su Hao.

"Why is your porridge like this?" Su Hao looked at his bowl, then at the bowls of Yang Gendi and Lu Xiuer, his eyes felt a little astringent.

I ate the porridge of vegetables at night. Su Hao's bowl was thick rice grains, while Yang Gendi and Lu Xiu'er's bowls were mostly vegetable leaves, and a few grains of rice could be seen sporadically. In fact, in the past, this was the case at home. In the eyes of the scholar Su Hao, this was a matter of course and was not worth mentioning at all. But now Su Hao cannot accept this kind of care for him. He is a big man who eats thick food, and his mother and sister who eats thin food. Can this still be called a human?

"Hao'er, you have to study and spend your brains. You have to eat a little bit more. Xiu'er and I are fine." Yang Gendi explained.

"Just eat it, it's not like this one day?" Lu Xiuer also said sourly.

Su Hao picked up the bowl, and without saying anything, he transferred one-third of the rice grains from his bowl into Yang Gendi's bowl, and another one-third into Lu Xiu'er's bowl. Yang Gendi and Lu Xiu'er were both shocked by his actions. After a long time, Yang Gendi said, "Haoer, you..."

"Mom, you and Xiu'er are doing things in the fields, which cost a lot of money and should be full. In the future, our family will have enough food, and if you want to be full, they will be full together, and if you want to be hungry, they will be hungry together." Su Hao said.

"Silly boy." Yang Gendi didn't know whether she should be happy or sad. She wanted to turn back the rice grain that Su Hao had just handed over to her, but the firm look in Su Hao's eyes made her hesitate.

"Mom, my son used to be ignorant and lazy, which made you and Xiu'er suffer. Don't worry, from now on, I will be reborn. I swear that within a month, I will definitely let you eat something delicious and drink something spicy, and I will never let you be hungry for another day!" Su Hao solemnly promised to his mother.

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Chapter completed!