Cooling of synchronous generators is divided into two types: external cooling and internal cooling.
1. External cooling: including air cooling and hydrogen cooling.
Air Cooling: The cooling medium is air, i.e. air is used to carry away the heat generated due to losses in the generator. This method has a simple structure, but the cooling efficiency is not high. The maximum installed capacity can reach around 100 MW.
Hydrogen cooling: The cooling medium is hydrogen, that is, hydrogen is used to remove heat. High cooling capacity compared to air. The ventilation loss is low, but the structure is complex and requires hydrogen storage equipment. The maximum installed capacity can reach around 200 MW.
2. Refinternal cooling: including internal water cooling of stator, internal hydrogen cooling of rotor, etc.
Internal cooling (direct cooling method): the cooling medium is water, oil or hydrogen, that is, hydrogen, Water or oil passes through the inside of the wire to carry heat away directly from it. the two aforementioned surface cooling methods. The high cooling capacity can reduce the size of the generator, save materials and facilitate the manufacturing of large capacity generators. However, the generator structure is complex, copper loss is large, iron loss and. the mechanical losses are low and the total loss is similar.
Why is the water temperature of the 200 kilowatt diesel generator high?
1. Application of water cooling system
People have started sincelong time to use water. for cooling For hot machines, the heat sink can be used to contact the CPU core when cooling the computer CPU, so that the heat generated by the CPU is transferred to the heat sink through thermal conduction, and then the Fan is used to remove the heat emitted into the air.
However, the specific heat capacity of water is much greater than that of air, so water can be used instead of air as a means of heat dissipation, and water with increased internal energy can be discharged by a water pump to form a water cooling system. In this way, the water temperature will not increase significantly after the heat generated by the CPU is transferred to the water, and the heat dissipation performance is better than the above-mentioned system which uses saymainly air and fans.
The cooling system of heat engines (such as car engines, power plant generators, etc.) also uses water as a coolant, which also takes advantage of the large specific heat capacity of seawater.
2. Application to agricultural production
Rice is a heat-loving crop when growing seedlings in March and April each year, farmers generally use the method of "shallow water and frequent irrigation ". " to prevent freezing., that is, pour water into the rice field overnight in the evening, and then empty the water from the rice field when the sun rises the next day. According to the characteristics of the large specific heat capacity of water, when the temperature drops at night, the temperature of the plants does not change much, which plays a role in maintaining the heat of the plants
3.hot water heating
Radiators and hot water bottles for heating in winter.
4. Use the large specific heat capacity of water to adjust the climate
Impact on temperature: after impounding the Three Gorges Reservoir, the world's largest artificial lake will become an "air" air conditioner ", making the mountain city Chongqing's climate is warm in winter and cool in summer. It is estimated that summer temperatures could drop by 5 degrees Celsius and winter temperatures could rise by 3 to 4 degrees Celsius.
Why do the mountain towns of Chongqing become hot in winter and cool in summer? It turns out that with the creation of reservoirs and the increase of water,The specific heat capacity of water is large? and the temperature changes little when exposed to cold or heat at the same time, so the temperature in summer will not rise higher than in the past and thetemperature in winter will not drop. lower than in the past, keeping the temperature relatively stable, so that the tank becomes a giant “natural air conditioner”.
4. Others
For example, in the hot summer, the ancient royal family used running water to flow from the roof, which played a role in preventing heat stroke and Hawaii's cooling ; is an island at the bottom of the Pacific Ocean, where the climate is pleasant. Besides the attractive scenery, another main reason is that it is warm in winter and cool in summer.
Detailed information:
Distilled water is pure water, artificial water (water obtained by combining hydrogen and oxygen atoms through a chemical reaction). Water is one of the most common substances on earth. It is an important resource for the survival of all life, including inorganics and humans. It is also the most important component of living organisms. Water has played an important role in the evolution of life. It is a non-renewable resource in the narrow sense and a renewable resource in the broad sense.
Pure water can conduct electricity, but very weakly (conductivity can be ignored in daily life), and it is an extremely weak electrolyte. Water in daily life contains more positive and negative ions due to other dissolved electrolytes, and its conductivityspeed is improved.
For humans, water is the most important substance after oxygen. In the adult body, 60 to 70% of its mass is made up of water. The proportion of water in children's bodies is even higher, reaching almost 80%.
If a person does not eat and relies only on nutrients stored in their body or consumes their own tissues, they can live for a month. But it is difficult to go even a week without drinking water. Loss of 10% of water in the body threatens health, and loss of 20% of water endangers life. This shows the importance of water for life.
Water also has the effect of treating common illnesses. For example: a cup of cold boiled water in the morning can treat pimples; drinking water half an hour after a meal can be used to lose weight; the massage effect of hot water is a powerful soothing effect. Taking medication can relieveinsomnia ; drinking large sips of water can relieve constipation; a glass of water before going to bed is good for the heart, when you feel sick you can use salt water; to induce vomiting.
Baidu Encyclopedia: Water
1. Diesel generators use hard water for a long time. used, the water tank generates temperature. Then a large amount of scale will be formed throughout the water tank and water channels, resulting in poor heat dissipation
2. channels of the generator body and cylinder head, causing blockage of water circulation and poor heat dissipation. The generator set burned oil severely, resulting in excessive carbon deposits and poor heat dissipation;
3. Improper operation and use of the dieselgenerator. When starting the diesel generator, you must first use a small or medium throttle to preheat for a while. Do not suddenly increase the throttle or suddenly increase the load, otherwise the diesel generator will run abruptly and increase the temperature. will increase sharply. Or long-term overload operation of the diesel generator will also cause the diesel generator to be too high in temperature.
4. Too late fueling time will cause the diesel generator to overheat; . Putting it into operation at full load immediately after a repair may cause overheating of moving parts or jamming due to too little mounting clearance. A lack of cooling water causes the diesel generator to overheat.