Papers by Keyword: Saving Energy

Abstract: Technologies that take advantage of alternative sources, such as Michell-Banki turbines, can improve electric power conditions in rural or non-interconnected areas with low environmental impact, but they need to be further studied to better understand their phenomenology and ways to increase their performance. The numerical evaluation of rotors under specific operating conditions results in efficiency curves for the evaluated prototypes such that devices that take full advantage of the flow conditions of a given location are proposed. Considering the above, the main objective of this work was to design the rotor and the injector of a Michell-Banki turbine and to evaluate it numerically for the conditions of 0.24 m³/s and 18 m of head available at a point with potential energy use in the irrigation district Canal Iguá in Huila - Colombia. The design was made following OLADE recommendations, and the simulations were made utilizing computational fluid dynamics, the k- ω turbulence model was used and the torque was monitored, then the GCI and TCI were calculated to establish the numerical uncertainty of the results. Finally, the numerical curves of efficiency versus rotor speed were created. Both the design and simulation results show that the design is feasible for the operating conditions and meets the expectations of serving for the installation of a 20 kW micro-hydroelectric power plant at the site, but the design predicted an atypically high 86.3% efficiency, while the simulation reported an atypically low 51.8%, being 78% the average reported according to OLADE.

Abstract: In the countries with tropical climates such as Malaysia, humidity and hot weather are well-regarded; this weather can affect the heat conditions and indoor room. The effects of the poor thermal condition are non-conducive human activities and a comfortable environment in the room. They improved the tilt angle for roof building or house design with insulation to achieve comfort and reduce the indoor temperature. Thermal insulation is one of the methods to reduce heat transmission through the room by applying proper material and installation. The main objective of this study is to test Glasswool insulation in different orientations of the roof for Malaysian houses. The insulation material has been tested by airflow simulation using SolidWorks software which applies to the rooftop on the east and west orientations, where the indoor temperature of the house has been reduced from (29°C - 27°C East and 30°C - 28°C West) without considering any air movement. The simulation result shows the temperature reduction before and after applying the insulation corresponds, while the reduction is 2°C temperature (7.4% reduction) at both orientations. The significant reduction helped the occupants to reach their comfort zone and save the cost of the electrical bill.

Abstract: The process of multi-back after blending water from one station is used in a block of Daqing oilfield, for saving energy, reducing consumption and easy to manage. For this block’s water blending system, research on its blending parameters optimization is carried on. According to the block’s characteristic of the process, the characteristic of energy cost minimum as objective function, setting up the multi-back after blending water from one station system’s parameter optimization mathematical model[1]. The model belongs to nonlinear programming problems with constraints, the mixed penalty function method and the improved conjugate direction method are used to solve the model, the optimum water blending temperature is determined by optimization calculating as 62.1°C and quantity of blending water a year is 1.13×105 t . By doing so, running costs saved 220,000 yuan per year to achieve the goal of saving energy and reducing consumption.

Abstract: The air-conditioning load is directly related to energy consumption of the car. Based on the characteristics and sources of the air-conditioning load of the car driven in four typical cities, this paper gives an analysis on the air-conditioning load using the steady-state heat transfer calculation method. The result indicates the regionalism design on the air-conditioning system for car is feasible and beneficial to save energy.

Abstract: The thesis describes the loss model of distribution network and gives the transformer loss model and line loss model, Then it proposes some loss reduction measures at the stage of planning and design as well as operation and maintenance. Finally, according to the main problems about the loss reduction measures in China, it puts forward some countermeasures to reduce line loss . Distribution network as part of the end for power configuration which is directly connected with the users of demand side. The loss of distribution network has been high because of feeder radius, complex voltage grade and a large number of devices on the network. The line loss of distribution network represents a major component of the line loss in the whole power system, the line loss of 10kv and below distribution network accounts for about 78% in it according to statistical analysis[1-2]. So, under the current energy shortage situation, there is a great economic and social significance to adopt the reasonable measures to save energy and decrease loss in distribution network.

Abstract: In order to reduce operating temperature of deep mine, took shallow rock layer low temperature effect of mine as natural energy (cold) source in the spring and summer, used shallow abandoned waste roadway as cooling space to carry out research on deep cooling ventilation. Built model of heat and moisture exchange between inlet airflow and low temperature rock layer, carried out numerical simulation for inlet airflow cooling process of specific test mine. At the same time, inlet airflow cooling results of the experimental mine was gotten through testing and verifying. Results show: using this natural energy (cold)source that shallow rock layer low temperature effect of metal mine and abandoned resource of roadway, shaft, slop etc. cooling the inlet airflow instead of artificial refrigeration to auxiliary mine deep cooling in the spring and summer have practical saving energy significance and better applied prospect.

Abstract: s: Polymer mixing is the key process of rubber products manufacturing, and mixer is the core equipment in polymer mixing process. By analysis of the effective factors on mixer mixing temperature, this paper study realization method of temperature control system. A polymer temperature control system using tandem mixing technology is designed to improve the mixing efficiency and the quality.

Abstract: A new mechanism of saving energy and reducing pollution is brought forward by analyzing water characters in high temperature condition and all factors which bring saving energy and reducing pollution in the combustion process of emulsification oil. The theory shows that the reason of saving energy and reducing pollution is that emulsification oil can reduce surplus air ratio effectively in the combustion process. These reasons include that of improving the burning flame temperature, avoiding the local super-high temperature, decreasing the amount of NOX and the conversion of SO2 oxidize to SO3, strengthening the burning and heat transmission and reducing the soot of the flue gas.By this new theory, the reasons of saving energy and reducing pollution in the combustion process of emulsification gasoline, emulsification diesel oil, emulsification heavy oil and other slurry fuel of W/O or O/W can be well explained. At the same time, the new mechanism was well validated in the combustion process of hard asphalt water slurry.

Abstract: To assess some technologies which are more appropriate for the development of the iron and steel industry in China, a model was developed based on the Long range Energy Alternatives Planning System (LEAP) to assess the energy saving and CO2 reduction potentials from 2010 to 2040. The results show that the top three saving energy potentials is non-blast furnace iron-making accounted for 6.85%, device enlargement for 5.85%, advanced blast furnace for 4.84%, and also show that the top three CO2 reduction potentials is device enlargement accounted for 11.7%, non-blast furnace iron-making for 6.21%, advanced coke and blast furnace 5.52%. In the Mitigation scenario, it can reduce 28% of the initial energy demand and 35.2% of CO2 emissions. It can provide a method and data for search energy saving and CO2 reduction potentials in iron and steel industry by LEAP model.

Abstract: This article analyzes the problem in application the solar system was used in residential building, puts forward the requirements to use energy and choose the setting of the solar energy collector from two aspects of building and drainage design respectively. In addition, the article explicates andthe solar energy collector and building integrated design and the development of solar energy collector. At last, the article puts forward some Suggestions on the improvement and development of residential solar hot water system and the design of the hot water supply bath solution of practice to make solar energy and low power assisted by night combining.