【Daily Discussion】Utilities - HVAC - 20200917

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.

The percentage of the heat effectively utilized by a boiler per unit of time, relative to the total heat input to the boiler, or the percentage of effectively utilized heat per kilogram of fuel or per standard cubic meter of fuel, is known as the boiler’s thermal efficiency. 1. Positive balance method: The formula for calculating the thermal efficiency using the positive balance approach is as follows: Thermal efficiency = Useful heat energy utilized / Total heat energy released by the fuel * 100% = Boiler evaporation rate * (Steam enthalpy – Feedwater enthalpy) / Fuel consumption * Lower heating value of the fuel * 100%. Here, the boiler evaporation rate is determined through actual measurement, in kg/h ； Steam enthalpy – obtained from the enthalpy-entropy chart, kJ/kg ； Feedwater enthalpy – obtained from the enthalpy-entropy diagram, kJ/kg ； Fuel consumption — measured actually, kg/h ； Lower heating value of fuel — actually measured, kJ/kg. 2. Counterbalance method: The counterbalance thermal efficiency can be calculated using the following formula. Thermal efficiency = 100% – the sum of the percentages of various heat losses = 100% – q2 – q3 – q4 – q5 – q6, where q2 represents the heat loss due to exhaust gases, in % ； q3——Heat loss due to incomplete combustion of gas, % ； q4 – Heat loss due to incomplete combustion of solids, %; q5 – Heat loss through heat dissipation, % ； q6 —— Physical heat loss of ash, %.

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.

It is directly obtained from the definition of boiler thermal efficiency, which is the ratio of the heat effectively utilized by the boiler to the heat supplied by the boiler. The formula is: η=Q1/Q2×100%. The method used by site administrators is called the positive balance method.