When the diesel generator is running, part of the fresh air will be sucked into the combustion chamber, so that it will be evenly mixed with fuel in the combustion chamber to drive the generator to continue to operate.At the same time, a large amount heat of the generated during operation must be dissipated in the computer room in time, which will consume a lot of cool air. Therefore, generator must have a good circulating water cooling or oil cooling structure, and the cooling and ventilation system of the engine room is also very important and indispensable. It is necessary to ensure that there is enough air flowing through the engine room to supplement the consumption and discharge the heat of the generator through the radiator, so keep the temperature in the engine room is as close to the ambient temperature as possible and keep the generator temperature within the normal operating range.