The electric heat storage system has a fast response speed and high adjustment precision, and is an excellent peak-load regulation resource for the power system. This paper explains the basic types and working principles of electric heat storage systems, and summarizes the basic methods and compensation standards for electric heat storage facilities participating in the auxiliary service market. Through the case of a 10MW electric heat storage system in Northeast China, the paper analyzes the profitability of the electricity supply with or without capacity fee, government subsidies and bilateral transactions with the new energy station. The results show that under the current market and price mechanism, electric heat storage facilities participating in the ancillary services are less economical and less motivated, consistent with the actual situation.
•Three kinds of corrugated tubes are investigated experimentally and numerically.•The corrugated tubes can increase heat transfer performance by 50%.•The corrugated tubes is compared with plain tubes under three constraints. In this work, experimental and numerical study was performed to determine the heat transfer and pressure drop characteristics of corrugated tubes. Measurement and simulation are conducted for three kinds of corrugated tubes. The corresponding plain tubes were simulated at the same time. In the numerical simulation the flow is modeled as being axisymmetric and fully elliptic by using body-fitted finite volume method and the Low-Rek-ε turbulent model. The uniform heat flux boundary condition is specified to simulate the electrical heat using in the experiments. The heat transfer performance of the corrugated tubes is compared with plain tubes under three constraints (identical mass flow rate, identical pumping power and identical pressure drop). The experimental results and numerical results are in good agreement. It was found that the corrugated tubes have a good synergy than plain tubes and an appreciable increase in heat transfer performance. The corrugated tube possesses a large market potential.
Along with the fast growth of power demand, power bases' constructions also progress at fast pace. Based on real projects, this paper calculates, analyzes and compares two power bases' transmission solutions in the areas of external construction conditions, generation price, retail price and power transmission approaches, etc. Then it points out respective advantages of these two bases in the areas of external resource condition, electric technology level and pricing, etc. All the findings and conclusions mentioned in this paper can be treated as solid foundations for decision maker when they need to make decisions in projects of constructing power bases