Explore professional insights, case studies, and maintenance tips from our engineering team specializing in diesel generator radiator and cooling system design.

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  Industry News

  Sep 18,2025

  Temperature rise requirements and cooling methods for diesel generator sets

  As an emergency power source, diesel generator sets need to operate continuously for extended periods. Given such a heavy load, the temperature of the generator sets becomes a challenge. To maintain good uninterrupted operation, it is necessary to keep the temperature of the generator sets within an acceptable range. This requires everyone to understand the temperature rise requirements and cooling methods.1: Temperature rise requirementsBased on the different insulation levels of diesel generators, their temperature rise requirements vary. Generally, when a generator is in operation, the temperature of its stator winding, excitation winding, iron core, collector ring, etc. is about 80 degrees Celsius. If it exceeds 80 degrees Celsius, it is considered to have an excessively high temperature rise.II: Cooling methodGenerators of different types and capacities have varying cooling methods. However, the cooling mediums commonly used are air, hydrogen, and water. Taking the turbo-synchronous generator as an example, its cooling system is enclosed, and the cooling medium is recycled.(1) Air coolingAir cooling is achieved by using fans to blow cold air onto the ends of the generator windings, as well as the stator and rotor of the generator set, to dissipate heat. After absorbing heat, the cold air turns into hot air, which initially converges between the stator and rotor before being discharged through the air ducts of the iron core and then cooled by the cooler. The cooled air is then blown back into the generator by the fan for internal circulation and heat dissipation. Medium and small-sized synchronous generators generally adopt air cooling.(2) Hydrogen coolingHydrogen cooling utilizes hydrogen as the cooling medium, and hydrogen has better heat dissipation performance than air. For example, most turbo-generators are cooled using hydrogen.(3) Water coolingThe water cooling system employs a dual internal water cooling approach for both the stator and rotor. The external water system of the stator water system flows through water pipes to the inlet rings mounted on the stator frames, and then through insulation tubes to each coil, where it absorbs heat. Afterwards, it flows through insulation water pipes to the outlet rings mounted on the machine base, and is then discharged into the external water system of the generator for cooling. The cooling process of the rotor water system begins with water entering the inlet support mounted on the shaft end of the exciter side, then flowing into the central hole of the rotating shaft, and then flowing through several radial holes to the water collection tank, and then through insulation tubes to each coil. After absorbing heat, the cold water flows through insulation tubes into the water outlet tank, and then through the drainage holes on the outer edge of the water outlet tank to the water outlet support, and is led out by the main water outlet pipe. Since the heat dissipation performance of water is much higher than that of air and hydrogen, newly built large generator sets generally adopt water cooling methods.
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  Industry News

  Sep 18,2025

  How does high temperature in summer cool down the generator

  The cooling of generators becomes particularly crucial during summer. Over time, machines not only generate heat internally but also absorb heat from the surrounding air. Failure to cool them down promptly can potentially lead to machine malfunctions. Below are several points regarding how to dissipate heat from generators in high summer temperatures:First, the temperature of the usage environmentTo ensure the normal operation of the generator set, a good ventilation environment is required. In particular, it is necessary to ensure that the exhaust and smoke evacuation of the water tank are in good condition. At the same time, the floor of the engine room should be kept clean and the ventilation of the engine room should be good. Furthermore, if the generator is used outdoors, it should be placed in a shady area as much as possible. If this is not possible, a wooden board can be placed on top of the generator to prevent direct sunlight exposure. It is also important to note that when placing the wooden board, avoid covering the exhaust vent to ensure smooth exhaust.II. Keep the cooling system clean and the coolant sufficientKeeping the cooling system clean can effectively improve the heat dissipation efficiency of the generator set and provide a good operating environment for the generator set. Let's take the radiator as an example. If the exterior of the radiator is stained with dirt, oil, or if the cooling fins are deformed due to collision, the heat dissipation effect of the generator set will be affected. If such conditions are found during use, they should be cleaned or repaired in a timely manner.When the generator set is in a dry and cold state, the coolant level should be between the high and low marks on the water tank, neither too high nor too low, otherwise it will affect the cooling effect of the generator set.III. Avoid overload operation of generator setsIf the generator set operates at overload for an extended period, it can lead to a reduced cooling effect of the coolant, resulting in excessively high temperatures within the generator set and affecting its normal use.
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  Company News

  Sep 18,2025

  Why can't the coolant temperature of a diesel generator be too low?

  In practical use, there is a misconception that the lower the coolant temperature of a diesel generator, the better. In fact, we have clear requirements for the use of diesel engine coolant temperature. Some operators like to adjust the coolant temperature to be very low. Some are close to the lower limit of coolant temperature, and some are below it. They believe that if the coolant temperature is low, the water pump will not experience cavitation, the coolant will not be interrupted, and there will be a safety factor during use. In fact, as long as the coolant temperature does not exceed 95°C, cavitation will not occur, and the coolant will not be interrupted. Conversely, if the coolant temperature is too low, it will cause great harm to the diesel engine.1. As the viscosity of the engine oil in the lubrication system increases, the operational resistance of the parts increases, leading to poor lubrication and increased wear between parts. For example, when the coolant temperature is 30℃, compared to a coolant temperature of 80-90℃, the wear on the cylinder liner, piston, and piston ring will increase by about 5 times.2. Low coolant temperature, deteriorated combustion conditions in the diesel engine cylinder, poor fuel atomization, prolonged post-combustion period, rough diesel engine operation, etc., exacerbate the damage to components such as crankshaft bearings and piston rings, reducing both power performance and fuel economy.3. The water vapor produced after combustion tends to condense on the cylinder wall, causing metal corrosion.4. Unburned diesel can dilute engine oil, leading to poor lubrication.5. Incomplete combustion of fuel can form gummy substances, causing the piston ring to get stuck in the piston ring groove, the valve to get stuck, and a decrease in cylinder pressure at the end of compression.6. As heat loss increases, diesel engine power decreases and fuel consumption increases.7. Poor fuel atomization leads to incomplete combustion, reduced power output, and increased fuel consumption. If the coolant temperature is 40℃, the fuel consumption of the diesel engine will be about 10% higher than at 80℃. Therefore, a lower coolant temperature for the diesel engine is not necessarily better. It is generally controlled between 80-95℃.
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  Company News

  Sep 18,2025

  How to improve the heat dissipation of a diesel generator?

  If the power of the generator set is relatively high, it is recommended to install a cooling tower to enhance the cooling effect through cooling water circulation. Ensure that the air in the generator set room is unobstructed, install a ventilation fan to increase air convection. Enhance the air cooling effect of the diesel generator set by adding fans to blow directly onto the generator. Try to control the generator and avoid overload operation.Check whether the cooling system of the generator set is normal, such as whether the cooling water circuit is unblocked and whether the radiator is dissipating heat smoothly.Generally, the Weichuang radiator can fully meet the cooling needs of the corresponding diesel generator set. Try to identify the cause of excessive heat, as this will better protect the diesel generator.