It depends on what you do with it. Coal with great value, high heat, fire resistance and high temperature. Although 5000 kcal coal is not as high as 7000 kcal coal, the price is favorable. It depends on your actual needs, such as whether you use it for boiler combustion or collective hot water supply, so you don't need 7000 yuan, which is a waste. If it is used for steelmaking, it is necessary to make good use of coal, so it is necessary to combine your own needs and actually buy it.
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According to the heat calculation formula: q = g c (TG-th), it can be known that when the heating system provides the same heat q to the heat users, the temperature difference between supply and return water Δ t = TG-th is directly proportional to the circulating water quantity g.
In other words, if the temperature difference between the supply and return water of the system is large, the circulating water will be small and the power consumption of the pump will be greatly reduced. From the following example, we can see the relationship between temperature difference and power consumption.
In the process of human life activities, all life activities need energy, such as the synthetic reaction of material metabolism, muscle contraction, gland secretion and so on. And these energies mainly come from food. Nutrients contained in animal and plant foods can be divided into five categories: carbohydrates, lipids, protein, minerals and vitamins, and water is six categories. Among them, carbohydrate, fat (fat can also store calories) and protein can release energy through oxidation in the body. These three are collectively referred to as "productivity nutrients" or "heat sources".
Low calorie food:
1, Apple100g /52 kcal
Apple is the slimming fruit that most people will choose, because it is rich in pectin, which can help gastrointestinal peristalsis and eliminate toxins in the body. Best of all, it can also reduce heat absorption. Plus apples contain a lot of potassium, which can prevent leg edema.
2. Banana100g/125 kcal
Bananas are essential for many fruit diet meals, because bananas are rich in fiber, vitamin A, potassium and pectin, so they can effectively regulate the intestines and help defecate. Bananas also have the effect of removing water, which is not only the best slimming fruit, but also a beauty product, which will moisturize the skin after eating. But bananas are high in calories, and if you eat too much, you will get fat.
3. Grapefruit100g /28 kcal
Europeans and Americans like to eat acidic fruits such as grapefruit to keep fit, because acidic fruits can promote intestinal digestion. Grapefruit is rich in vitamin C, which can eliminate fatigue and make skin beautiful!
4. Pineapple100g /32 kcal
Pineapple is also an acidic fruit, which can help the whole intestine and digestion. Plus pineapple is rich in enzymes, which can decompose toxins and promote drainage, so it is also a fruit that people who want to be thin can eat in moderation. But it's best not to eat pineapple before meals, because it will hurt your stomach, so you must eat something to pad your stomach before meals, so _, although delicious, you can't eat too much.
5. Honey100g /32 1 kcal
Compared with fruit, honey has higher calories, but why do some people say that honey can lose weight? Eating honey has the function of treating and preventing constipation, relaxing bowels and preventing obesity to some extent. Isn't the cause of obesity the accumulation of fat in the body? Many obese people are caused by constipation, so eating honey or drinking honey helps to lose weight. According to Shennong's Classic of Materia Medica, the effect of honey is "long and determined, light and healthy, not old and prolonged". The combination of Homo sapiens here is to lose weight. Not only can you lose weight, but you can also have a healthy body and live longer.