Full-Link Energy Efficiency Analysis of Wind Powered Heating System based on Energy Flow Chart

As an active attempt in the transformation of clean energy, wind powered heating system has attracted increasing attention in recent years. However, how to evaluate its energy efficiency has not been discussed in depth. This paper applies energy flow chart to analyze the whole-link energy efficiency considering source-load matching mode meticulously. Firstly, statistics on heat demand and clean electricity supply is analyzed in detail from perspectives including quantity, time, space and trend. Subsequently, a time sequence simulation model with wind power accommodation and efficiency taken into account is established to calculate the energy flow for each link of the system. Indicators are proposed from two aspects of energy and exergy which will be calculated based on the energy flow method. Case study is based on practice data of the Northern Hebei Province. Results show that the matching mode of source and load has an important effect on energy efficiency, for instance, the energy consumption increases 7.78kgce/GJ in the later stage of heating season compared with the medium stage. And if the system is designed reasonablly, wind power-to-heat system could be competitive compared with the traditional coal-fired heating system with less than half energy consumption, nearly twice thermal efficiency, and higher exergetic efficiency.