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Main Performance Index of Generator Set Diesel Engine and Gasoline Engine

Apr. 22, 2022

Today, we will briefly introduce the main performance indicators of diesel engines and gasoline engines for generator sets.


Power: The mechanical work done by the internal combustion engine per unit time, the unit is kW. Power is divided into indicated power and effective power. Generally speaking, the internal combustion engine power refers to the effective power, which represents the net power output by the internal combustion engine from the crankshaft. In order to keep the internal combustion engine running lastingly and reliably, the national standard stipulates the power of the internal combustion engine as follows:


genset generator


15 minutes of power. The maximum available power that allows the engine to run continuously for 15 minutes. This is a power index specified to meet mechanical requirements with good overload and acceleration performance in a short period of time.

1 hour power. The maximum effective power that allows the internal combustion engine to run continuously for 1 hour. This is a power index specified in order to meet the mechanical requirements of having a certain power reserve to meet the sudden load.

12 hours power. The maximum effective power that allows the internal combustion engine to run continuously for 12 hours. This is a power index specified to meet the mechanical requirements of continuous operation within 12 hours. Generally, the 12-hour power is also called the rated power, and the power of the internal combustion engine usually refers to this power.


Permanent power: The maximum effective power that allows the generator set's internal combustion engine to run continuously for a long time. This is a power index specified to meet the mechanical requirements of long-term continuous operation. Usually the permanent power is 90% of the power for 12 hours. Each internal combustion engine has two kinds of power and its corresponding speed marked on the nameplate according to the purpose and characteristics.


Thermal efficiency: The percentage of thermal energy that can be produced by the fuel consumed in relation to the available power. It indicates the degree of effective utilization of fuel. Generally, the thermal efficiency of diesel and gasoline engines is 20% to 40%.


Mechanical efficiency: The ratio of the effective power of an internal combustion engine to the indicated power. It represents the power loss of each system inside the internal combustion engine, represented by η. Generally, the mechanical efficiency of diesel engine and gasoline engine is in the following range: 0.78~0.85 for non-supercharged type, and 0.80~0.92 for supercharged type.


Fuel consumption rate: the amount of fuel consumed by unit power in unit time, expressed as ge, it is an important and commonly used indicator to measure the economy of internal combustion engines, usually the fuel quality (g) consumed by 1kW power in 1 hour. )To represent. Generally, the fuel consumption rate of gasoline engine is 270~475g/kW·h, and the fuel consumption rate of diesel engine is 215~340g/kW·ho. Torque: The torque that the internal combustion engine can drive the working machine can produce, expressed by M. It expresses the strength with which the working machine produces the rotational force.


Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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