People who are engaged in geological exploration often have to stay in the homes of fellow villagers, so Su Hao is no stranger to farming. In his impression, in the early years, the southern countryside burned straw from the fields as fuel, but later with the economic development, more and more people could afford to buy coal and even liquefied gas, and the situation of burning straw gradually decreased.

In this current home, he clearly saw that Yang Gendi also used straw when he lit the fire, why did Lu Xiuer still go to pick firewood?

Yang Gendi saw her son's confused look, so she had to explain helplessly: "Of course, cooking is to burn grass, but how can the grass be burned." The straw recovered from the field is enough to burn for half a year, so how can it be enough not to pick firewood to burn? Every family in this village is like this. Last year, Xiu'er was bitten by a snake in order to pick firewood, don't you remember? ”

"Well, it seems like that." Su Hao nodded. In the past, Su Hao, the talented showman, lived in his own scriptures all day long, and although he knew about his sister and fiancée being bitten by a snake, he didn't react. It was a few neighbors who helped to send Lu Xiuer to the nearby Shitan Town to ask the doctor to see her, which saved her life.

"Why don't you go to Wen Shu?" Yang Gendi was quite surprised to see her son looking around, asking long and short questions. In the past, my son never cared about things at home, and he would never set foot in the kitchen unless he was looking for something to eat. Why did he suddenly become interested in these things today?

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

"Will you make a fire?" Yang Gendi's eyes widened, in her memory, her son didn't seem to have burned the fire once, and no matter how busy she and Lu Xiu'er were, Su Hao would never take the initiative to say a word of help.

Su Hao walked to the stove, sat on the small bench where the fire was burning, picked up a handful of dry straw, broke it with his hands, let the straw spread out a little, and then stuffed it into the hearth.

Yang Gendi stood aside and asked in surprise, "Hao'er, when did you learn to make fire?" ”

"Burn the fire...... Do you need to learn it too? Su Hao asked rhetorically.

In fact, burning an earthen stove in the countryside still requires some skills. First of all, the straw should not be stuffed into the hearth in a bundle to burn, because it will not be easy to burn through. Secondly, when stuffing straw into the hearth, you should stuff it in a little first, and then stuff the back into it when the front is finished. If you don't know these skills, just stuff the straw into it very stiffly, and the fire in the hearth will be stirred up, and it may even be extinguished.

Su Hao's set of skills was practiced by him in his previous life after helping others burn fires in the farmhouse, how could he explain it clearly to Yang Gendi?

"My son is just smart, and he can see everything. When Xiu'er first helped me light the fire, she didn't burn as well as you. Yang Gendi looked at her son's skillful movements and said with relief.

"Mom, I understand, this stove in our house is not good, this is the reason why our straw is not enough to burn." Su Hao sat down to light the fire, but he didn't just want to help Yang Gendi do some work. When he stood there just now, he had already looked at the stove at home, and he found that the stove was very unreasonably designed, and after trying to burn a few handfuls of straw, he was more convinced of his judgment, and he knew that this was the main reason why the straw at home was not enough to burn.

Yang Gendi was very unimpressed, she said: "Hao'er, what are you talking about? This stove was specially invited by Dr. Mud from Shitan Town when your grandfather was alive, and the stove in the whole village, except for the Chang's family, is as good as our family. ”

The word doctor, in the local area, is used to refer to carpenters. But other craftsmen, if they are more skilled, people will also call him a doctor, but they must be preceded by a prefix that represents the profession. Yang Gendi said that the mud doctor is a more famous mason in the town, and there are many ways to make stoves, and the stoves made by professional masons are indeed much better than those built casually at home.

But this stove, which was evaluated by Yang Gendi as the second in the village, was full of flaws in Su Hao's eyes.

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

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

In addition, a large stove will also lead to heat loss; The chimney on the roof is certainly not high enough to have the effect of inhalation, which is one of the reasons why the air in the furnace is not circulated.

Su Hao can see these problems, not without reason, in his previous life, he had been exposed to a design called "saving firewood stove", and these are the main points of the above.

Speaking of provincial firewood stoves, this is actually a great achievement of the Ministry of Agriculture of the Republic. In the 80s of the 20th century, the Ministry of Agriculture launched a project to promote provincial firewood stoves, which funded 100 counties every year for up to 10 years, and promoted provincial firewood stoves in rural areas, and this project covered a total of 1,000 counties across the country in 10 years.

Most of the stoves used in rural China for thousands of years have defects such as Su Hao's stoves, resulting in extremely low thermal efficiency, with an average of less than 10%, which is the main reason why there is not enough fuel in many parts of rural China. Developed by a series of experts, the firewood saving stove promoted by the Ministry of Agriculture is simple in structure and requires little additional input, 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 do not need to cut down firewood, which is of great benefit to soil and water conservation in rural areas.

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

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 the technicians who promoted the provincial firewood stove, and now when he looked at his own stove, he naturally understood the problem.

Regarding this knowledge, Su Hao naturally couldn't explain it to Yang Gendi, with his understanding of Yang Gendi, he knew that if he proposed to give the family a new stove, Yang Gendi would definitely resolutely oppose it. There is not only a distrust of his technology, but also an element of feeling sorry for him and not being willing to let him work.

Thinking about this, Su Hao didn't say anything anymore, he was lighting the fire while chatting with Yang Gendi for some idle days, the mother and son were talking and laughing, but they were also happy.

Lu Xiu'er came back from picking up firewood, and Yang Gendi had already prepared the rice, served it in three large bowls, and put it on the table of the eight immortals in the hall, a family of three, one bowl per person. As for the next dish, it is a small plate of bean dumplings and two pieces of moldy tofu.

"Eat quickly, didn't you say you're hungry?" Yang Gendi looked at Su Hao and said.

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

At night, he ate porridge with green vegetables, Su Hao's bowl was thick rice grains, while Yang Gendi and Lu Xiuer's bowls were mostly vegetable leaves, and only a few grains of rice could be seen sporadically. In fact, in the past, it was like this when eating at home, and in the eyes of that talented Su Hao, this is a matter of course, and it is not worth worrying about at all. But now this Su Hao can't accept this kind of care for himself at all, he is a big man who eats thick, and his mother and sister eat thin, can this still be called a person?

"Hao'er, you have to study, spend your brains, you have to eat a little more, Xiu'er and I have to eat less, it's okay." Yang Gendi explained.

"You just eat, when is this not the case?" Lu Xiu'er also said sourly.

Su Hao picked up the bowl, and without saying anything, he dialed one-third of the rice in his bowl to Yang Gendi's bowl, and another third to Lu Xiu'er's bowl. Yang Gendi and Lu Xiu'er were stunned by his actions, and it took a long time before Yang Gendi said, "Hao'er, you ......"

"Mom, you and Xiu'er are working in the field, and they consume a lot, so they should be full. In the future, we will eat as a family, and we will be full together if we are full, and we will be hungry together. Su Hao said.

"Silly boy." Yang Gendi didn't know whether to be happy or sad, she had the heart to dial back the rice that Su Hao had just allocated to herself, but the determined look in Su Hao's eyes made her hesitate.

"Mom, my son was ignorant in the past, and he was lazy to do it, which made you and Xiu'er suffer. Don't worry, from now on, I will be reborn, I swear, within a month, I will let you eat and drink spicy food, and I will never let you go hungry for another day! Su Hao solemnly promised to his mother.