There are many boiler manufacturers, and the thermal efficiency of boilers varies greatly from manufacturer to manufacturer and boiler brand to boiler brand. There are generally two methods for calculating the thermal efficiency of gas boilers, namely the positive balance method and the reverse balance method, which are specifically introduced as follows:
1. Positive balance method
The method of calculating thermal efficiency by the ratio of the heat used by the boiler to the total heat that the fuel can release is called the positive balance method, also known as the direct measurement method. The calculation formula of positive balance thermal efficiency:
Thermal efficiency = effective utilization of heat/total heat that the fuel can release * 100% = boiler evaporation * (steam enthalpy - feed water enthalpy)/fuel consumption * low calorific value of fuel * 100% In the formula, boiler evaporation - actual measurement, kg/h;
From the above thermal efficiency calculation formula, it can be seen that the positive balance test can only calculate the thermal efficiency of the boiler, but cannot obtain the various heat losses. Therefore, through the positive balance test, we can only understand the size of the boiler's evaporation and the level of thermal efficiency, but cannot find out the cause and propose improvement measures.
2. Counter-balance method
The method of measuring and calculating the heat loss of the boiler to obtain the thermal efficiency is called the counter-balance method, also known as the indirect measurement method. This method is conducive to a comprehensive analysis of the boiler, finding out the various factors that affect the thermal efficiency, and proposing ways to improve the thermal efficiency. Counter-balance thermal efficiency = 100% - the sum of the percentages of various heat losses.
There are many boiler manufacturers, and the thermal efficiency of boilers varies greatly from manufacturer to manufacturer and boiler brand to boiler brand. There are generally two methods for calculating the thermal efficiency of gas boilers, namely the positive balance method and the reverse balance method, which are specifically introduced as follows:
1. Positive balance method
The method of calculating thermal efficiency by the ratio of the heat used by the boiler to the total heat that the fuel can release is called the positive balance method, also known as the direct measurement method. The calculation formula of positive balance thermal efficiency:
Thermal efficiency = effective utilization of heat/total heat that the fuel can release * 100% = boiler evaporation * (steam enthalpy - feed water enthalpy)/fuel consumption * low calorific value of fuel * 100% In the formula, boiler evaporation - actual measurement, kg/h;
From the above thermal efficiency calculation formula, it can be seen that the positive balance test can only calculate the thermal efficiency of the boiler, but cannot obtain the various heat losses. Therefore, through the positive balance test, we can only understand the size of the boiler's evaporation and the level of thermal efficiency, but cannot find out the cause and propose improvement measures.
2. Counter-balance method
The method of measuring and calculating the heat loss of the boiler to obtain the thermal efficiency is called the counter-balance method, also known as the indirect measurement method. This method is conducive to a comprehensive analysis of the boiler, finding out the various factors that affect the thermal efficiency, and proposing ways to improve the thermal efficiency. Counter-balance thermal efficiency = 100% - the sum of the percentages of various heat losses.