Energy Policy and Sustainability: A Case Study Applying Energy Management Contract in China

This article states the energy policies, especially Energy Management Control (EMC), and relative measurements in recent ten years in China. In order to identify the effectiveness of these energy policies in the industrial sector in China, a project using EMC on a circulation cool water system was described as well as its energy-conserving results. The results indicated that the pump head was higher than what the system needed, namely electric energy would be wasted since the output of pumps cannot match pipe resistance pressure, also, based on the test data, the system water flow was larger than the design parameter, the main reason, besides the pump head, was that the pumps cannot be adjusted effectively so that technical personnel can only meet the needs through different combination pumps, nevertheless, by this method it was impossible to adjust water flow accurately. Furthermore, the water chilling units were influenced by scaling because of the quality of circulating water, thus their resistance pressure was increased greatly. Additionally, the cooling capacity of cooling tower was also decreased and some components need to be replaced. According to problem diagnosis, corresponding measures, such as changing pumps, adopting frequency control and water treatment, were performed, and annual power consumption was reduced from 1970000 kWh to 960000 kWh while annual power rate was reduced from 1190000 yuan to 580000 yuan. The results of the present work implied that EMC can accelerate the implementation of energy conservation projects, therefore, this system is quite feasible and its development is prospective in China.