Abstract：

Under the dual-carbon background, the distributed energy conversion system has been gradually applied in the field of central heating because of its significant advantages in low carbon and environmental protection. This paper puts forward the unit energy consumption evaluation method for the key units in the distributed energy conversion system, such as heat pump, solar collector, plate heat exchanger and fuel cell, and carries on the thermodynamic modeling of each unit through EES software to quantitatively evaluate the economy of different units under different working conditions, and then puts forward the construction method of distributed energy conversion system to obtain the process economy optimization. On this basis, the optimization process is built. Taking a residential area in Beijing as an example, the heating season performance of the system is analysed. Finally the economy and carbon emission reduction analysis are carried out. The results show that when the outdoor temperature changes in the range of -10 ℃ to 5 ℃, the COP of the new distributed energy conversion system is 2.69 to 4.43, the efficiency of the solar collector is 45.19% to 61.87%, and the daily power generation of fuel cell is 8 047.4 kWh to 32 228.0 kWh. Compared with conventional thermal power stations, the operating cost saving rate of the new distributed energy conversion system is 32.66% to 53.92%, and the carbon emission reduction rate is 69.07% to 73.29%.

Keywords:distributed energy conversion system; construction method; economy; carbon emission reduction; heating; heat pump; solar collector; fuel cell