Applied Mechanics and Materials Vols. 291-294

Abstract: The direct contact heat transfer technique gives better heat transfer rates. In this paper, the operation of a simple system was simulated under different operating conditions. During the charging mode of the operation, refrigerant R134a is injected into water stored in an evaporator to exchange directly heat with the water and form clathrates. Later, the clathrate is used to cool water which is used for air-conditioning purposes. Direct contact charging and/or discharging eliminate the necessity of a heat exchanger inside the storage tank and leads to an effective heat transfer method. The results indicate that the performance of the system depends on the refrigerant type, compressor speed and the mass flow rate of the refrigerant.

Abstract: By modeling for the energy conservation and pollutants emission reduction of subway, the paper takes the subway as an electricity-replacing-oil strategy .Compared with the road oil consumption transportation, subway proves to be efficient in energy saving and environmental protection. It also has a large potential in further improvement.

Abstract: Reasonable choice of light sources was the key to achieve energy-saving of tunnel lighting. Performance comparisons of light sources were completed, tunnel model was designed with lighting software-DIAlux based on characteristics and design demands of tunnel lighting. Simulation experiments for HPS (high pressure sodium) and LED (light-emitting diode) were made in the tunnel model, lighting effects of HPS and LED in each zone of the tunnel were analyzed, the results show that LED has higher lighting efficiency and can save more 40% power energy than HPS under the same lighting condition and the same road surface average-luminance, and LED has better road surface lighting effects and better color rendering than HPS.

Abstract: This paper analyzed the moderating effect of COP’s identity and COP’s competition between network structure of COP and energy-saving technology innovation. The empirical analysis illustrates that the relationship between the COP’s relation strength and energy-saving technology innovation is fully mediated by COP’s identity and COP’s competition, and the relationship between the COP’s status disparity and energy-saving technology innovation is partly mediated by COP’s identity and COP’s competition.

Abstract: In order to save energy and decrease the damage of cashmere in dyeing processing, adding low-temperature dyeing auxiliary for cashmere dyeing is introduced in this paper. Some processing factors such as pH value, dyeing temperature and concentration of two different low-temperature dyeing auxiliaries are studied. The results show that the low-temperature auxiliary addition strategy successfully improved the mechanical properties of dyed cashmere, compared with the traditional cashmere dyeing method. The optimized conditions are shown as follows: 7g/L of low-temperature dyeing auxiliaries A (LTD-A) or 10g/L of low-temperature dyeing auxiliaries B (LTD-B), pH at 4, first dyeing for 15 min at 40 oC and then dyeing for 60 min at 80 oC.

Abstract: According to requirement of the energy conservation of the distribution system, this paper analyses the principle of D-STATCOM reducing Loss and saving energy in distribution system, from the point of reactive power compensation and harmonic filtering in this article from no point of view. Based on instantaneous reactive power theory, a control strategy for the D-STATCOM voltage bridge circuit designed, to use D-STATCOM the purpose to improve the distribution network power factor. The effectiveness and good operating performance of the device and control strategy are certified by simulation with PSCAD/ EMTDC, filtering out the harmonics and compensating reactive power, so as to achieve the purpose of energy conservation Loss Reduction.

Abstract: Abnormalities are caused by incorrect or inappropriate behaviors or appliance malfunctions. They may lead to electricity waste and safety hazards. This paper describes a novel appliance management system for detecting abnormal power consumption in convenience stores based on power meters. Our system detects abnormal power consumption through historical behavior models. Generalized extreme studentized deviate (GESD) and regression methods are applied to build behavior models. The behavior based abnormal detection methods can assist in preventing these waste and safety problems and improve the appliance management to achieve power saving.

Abstract: The present work describes the upgrade of one type seawater reverse osmosis (SWRO) unit by Work-Exchanger Energy-Recovery (WEER) system to increace the product flowrate. Before the upgrade, the unit operated at a capacity of 120t/d, and a specific electricity of 7.4kWh/m3. Tests conducted on the unit after the upgrade, when the plant operated at essentially the same pressure conditions, the capacity increase to 150t/d, and a 67.6% reduction in specific electricity to 2.4kWh/m3. This confirmed that the reduction in specific electricity was due to the WEER system. The operating experience with the plant of the first month is presented.

Abstract: This paper makes comprehensive analysis on energy saving factors of ventilation and air conditioning system in the underground engineering mainly from five aspects ,such as the overall scheme, cold - heat system, air system, water system and operation management . And based on this, furthermore, each energy saving factor is quantified , the energy efficiency evaluation indexes of each subsystem is studied .So that it provides a concrete and feasible evaluation index and its basic calculation method for energy-saving evaluation, diagnosis of energy saving and energy saving reconstruction work.

Abstract: Pipeline transportation is a substance conveying process that makes crude oil flowing from first station to ultimate station and at the same time takes a certain amount of driving energy for cost. Based on related theories of engineering fluid mechanics, mathematics analytic formula of driving exergy in oil pipeline transportation is deduced by micro-element analysis. We can get the conclusion that driving exergy loss has a positive correlation with diameter and throughput, and also a contrary trend with insulation thickness and outbound temperature by analyzing the influence on driving exergy loss from operation parameters in pipeline process,. This research can provide theoretical guidance for energy consumption classification, and further more, the technical support for energy consumption in pipeline system.