Advanced Materials Research Vols. 860-863

Abstract: In order to determine the energy saving effect of the pump system after the energy saving technical reconstruction project implementation, this paper mainly researches on how to measure and verify the pump system energy saving after the energy saving technical reconstruction project implementation for AC drive (drag) centrifugal, mixed flow, axial flow, vortex pumps and reciprocating pumps. This paper also puts forward the related definitions, boundaries, methods, technical requirements of measurement and verification, etc.

Abstract: Vertical U-tube ground heat exchanger (GHE) is a key component in geothermal energy utilization systems like ground source heat pump (GSHP). This paper used a two-dimensional transient mathematical model for predicting the heat extraction rate of a vertical U-tube GHE, which also took into account the temperature distribution under the ground. Furthermore the modelling predictions were validated using experimental data. The experimental validation on the model was performed in a GSHP system with a double U-tube GHE, which was of 55m depth. For temperature distribution under the ground, the absolute error and relative error between experiment and simulation are within 0.62°C and 3.71 %. Simulation results agreed well with the experimental results that validate the feasibility of the mathematical model.

Abstract: Various pollutants emitted by coal-fired boilers are one of the main culprits of fog and haze forming in recent years especially in the north of China. The paper analyzes the fuel-switching project for district heating and main pollutant reductions, emission reductions of atmospheric particulate matter are calculated by materials accounting method. The economic, environmental and social benefits are also calculated according to pollutant reductions. It is shown that clean energy can be used for district heating. The project provides the theoretical basis for coal fired to gas fired reforming for district heating in the north area and has a guiding role for the other areas of China.

Abstract: This design develop the equipment of centralized heat supply system heating according to need, energy-saving emission reduction technology in the end of indoor.The intelligent control, remote control technology that applied to the indoor heating system, developed with the realization of wireless remote control by mobile phone short message; along with the change of environment temperature and sunshine environment and intelligent control of heat supply; intelligent temperature control, real-time temperature storage, query and other functions of the controller.By controlling the switch on the intelligent control valve, which can be heating, reducing waste according to the actual situation of different users, to achieve the purpose of energy saving.

Abstract: This paper describes in detail the current situation of reclaimed water energy utilization in Beijing. There are three key facters have been intruduced in the dividing suitable areas of reclaimed water heat energy in Beijing, which are taking distance, heat transportation distance of reclaimed water and adaptability of heat pump system and building. The research will provides the scientific reference for the users and other related departments of application of reclaimed water source heat pump system, which will be helpful in popularizing the GSHP and giving full play to environmental protection and energy saving advantages of reclaimed water heat energy.

Abstract: This paper concerns the utilization parameters of reclaimed water, and evaluates the heat resource potential and suitable development area of reclaimed water. The heat energy from reclaimed water resources is expected to reach 1027 MW in 2020. The building area that is suitable for adopting reclaimed water heat pump system is about 1.4×10⁸m². The potential of utilization and development space are huge. There is more than 30% savings of operating cost by using reclaimed water heat energy for buildings with contrast to traditional supply mode, and can reduce more than 70% of the exhaust heat at the same time. The economic and environmental benefit are great.

Abstract: Comparing with the common jet refrigeration system, a central air conditioner combined with solar ejector refrigeration system was proposed. The system characteristic was presented. It can improve the coefficient of the single solar system and solve operation problem for day-and-night, and can reduce the energy consumption of central air conditioner. A reasonable ejector to match with the central air conditioning is a main component in the system. The ejector in the solar refrigeration system is preliminary analyzed by the pneumatic function method. It will provide the important reference to improving the conditioner performance and system efficiency on air conditioning energy saving.

Abstract: Non condensable gas (air) accumulating in the condenser will reduce heat transfer coefficient of condense and vacuum value, Reducing of condenser vacuum value will lower turbine efficiency. Chilled water spraying is adopted to cool down the steam before it is extracted through extraction opening in condenser so as to enhance extraction effect of vacuum pump. This paper gives analysis on chilled water spraying through extraction opening. Mathematic model of selected controlling volume near extraction opening is given. Maximum amount of spraying and its relationship with vacuum value and increment of extraction rate are also proposed.

Abstract: The research on the resource utilization, environmental protection and the sustainable development problem has already become an important subject. To analyze the industrial sustainable development of characteristics of high energy consumption in Beijing, Huairou and Shijingshan districts of sustainable development test zone is selected as the main object. Research on the typical industrial enterprises of test zone, the characteristic of energy use of high energy consumption industrial enterprises is analyzed. The result shows that the Huairou and Shijingshan districts take the same feature of high concentration of energy consumption. In addition, to make a further research on waste heat recovery and water recycling and other energy saving programs implemented by typical enterprises, the technical and economic analysis is also contained. Continue to thoroughly explore the potential to make a foundation for industrial energy work of sustainable development test zone in the "Twelfth Five-Year" period.

Abstract: To promote the development of energy-saving dispatch under the pressure of energy saving and environmental protection, this paper proposes an energy-saving dispatch method based on considering demand response, which establishes a bi-level optimization model based on the optimal allocation plan of thermal units and interruptible loads, and solve the problem with improved NSGA-II and sensitivity analysis between unit interrupt capacity and thermal unit output. The case study shows that this model can decrease the pollutants at both generation side and demand side significantly with guaranteeing the economic of power grid operation. The model can also give the dispatch schedule of thermal units and interruptible loads accurately and thus has some use value.