To analyze the real heating energy consumption of cogeneration units

a reference unit method for energy consumption analysis is developed

which is based on the comparison with condensing power unit with the same power generation. The reference unit method is compared with heat and exergy methods

and the quantitative differences of heating energy consumption rates among these methods are obtained. Moreover

with the reference unit method

the influence of the driving mode of circulating water pump in heat supply network on the heating energy consumption of the unit is analyzed. The results show that

when the heat load or electric load is fixed

the heating coal consumption rate calculated by the heat method is larger than that calculated by the reference unit method

the heating coal consumption rate calculated by the exergy method is close to that calculated by the reference unit method

and the difference varies from –1.61 kg/GJ to 4.21 kg/GJ. When the coal and electricity consumption for heating is evaluated

the total coal consumption of the cogeneration unit with steam circulating water pump in heat supply network is 0.23～0.32 t/h lower than that of the cogeneration unit with electric-drive pump

and the coal consumption rate of the cogeneration unit with steam-drive circulating water pump in heat supply network is lower than that of electric pump heating unit.