Advanced Materials Research Vols. 805-806

Abstract: In this study, the feasible distributed energy resource (DER) systems for the public building complexes have been examined for a major city within each of the five major climate zones in China, using economic performance as the sole criterion to be maximized. The results indicate that the hot summer and cold winter area is recognized to be the most suitable district to introduce DER (mainly gas engine and gas turbine units among various alternatives) systems from both economic and environmental viewpoints; while the DER systems are not popular in the mild climate zone.

Abstract: Solving efficiency of CCHP (Combined-Cooling, Heating and Power) system operation optimization by Linear programming (LP) is very important. The graphic solution is introduced to improve the solving efficiency, and the result of numeric study shows that the calculation efficiency is increased by 53.2 times faster than conventional loop method. Comparison study on several schemes for hotel, office building and shopping mall with different PGU capacity (PGU_cap) was taken, with the increasing of PGUcap, annual energy charge (AEC) decreases and pay back period (PBP) gets longer. Hotel has the shortest pay-back period (PBP) in the three buildings. Finally, the influence of gas price on system economic in the three buildings was analyzed.

Abstract: To recycle the waste heat in the exhaust gas of marine diesel engine, a new drying room heated by marine diesel engine exhaust gas is introduced. The drying room`s structure, working principle and the main design parameters calculating methods is designed. Comparing to the traditional heating methods, this kind of drying room make full use of the heat energy and will acquire huge economic benefits.

Abstract: In order to address the problems of the current air separation process such as the complex process, large equipment, cumbersome operation and high operating costs, a novel air separation process cooled by LNG cold energy was proposed in this paper, which is based on high-efficiency heat exchanger network and chemical packing separation technology. Utilization of high-efficiency heat exchanger network widened the operating temperature range of LNG cold energy from-140°C~ -70°C to-160°C~10°C and air separation pressure was also reduced from 0.5MPa to about 0.35MPa due to the chemical packing separation technology, thereby greatly improved the energy efficiency. An air separation process was designed with gasification scale of LNG at 3000m³/h, which could produce air separation product of 4.7t/h. Energy conservation reached 3228.9kWh, which meant the annual benefit was up to 23.248 million Yuan. With characteristics of miniature, skid-mounted and open-stop feature, the process can realize the full utilization of LNG cold energy in LNG satellite station in remote areas.

Abstract: This study presented the energy performance evaluation of a ground-water heat pump (GWHP) system based on actual operational data. The GWHP system was installed for apartment buildings in Wuhan, China. During one year, various operating parameters of the GWHP system were monitored and the coefficient of performance (COP) of system was determined based on the measurement. The energy consumption of the GWHP system is more than twice the average value of split air conditioner on residential application, because of continuously operating of the GWHP system and frugally intermittence operating of split air conditioner. The GWHP system is more economical than other central system. The energy savings rate of the GWHP system was 41.5% for the heating season comparing with boiler and 42% for the cooling season comparing with air source heat pump.

Abstract: Economic and technical analysis of substituting GSHP for conventional air-conditioning system (combined by cold central air-conditioner and electric coal-fired boiler) was carried out. Firstly, a brief introduction was made on types, characteristics and application scope of heat pump technology. Secondly, initial investment and operating costs was estimated, respectively. At last, carbon dioxide emission reduction was calculated. The results show that, compared to conventional air conditioner, heat pump has better economics and energy saving benefits.

Abstract: Ground source heat pump system (GSHPS) takes the advantage of shallow geothermal energy, and it can not only provides heat apply but also provide cold making power in a high efficiency and energy saving way. The GSHPS is a low carbon technology and has applied into use. But in China it is a new technology and lack of application. The paper describes the theory of GSHPS, the advantages of GSHPS, the using feasibility of GSHPS and its limitations. Compared with traditional systems, in consideration of system running conditions, energy consumption and the level of environment pollution, the GSHPS can be more efficient and less ecological disruption. And with the developing of the GSHPS technology, it can have a considerable prospect.

Abstract: Energy consumption of Shanghai oil gas Ltd is discussed. According to energy distribution, some problems and weaker are found. Some potential about saving energy are found and some analysis is done. The measures about saving energy are put forward and energy consumer and production cost will be reduced. At the same time, Energy supervision is enhanced by government. Energy is used in reason and environment is protected.

Abstract: Amount of water content in fresh air phenomena direct heat affect to be changed fresh air to hot air state for reducing refined sugar moisture during drying and conditioning process. A change relative humidity of air results in a significant variation of heat transfer rate. Therefore, in this research energy reduction of refined sugar drying and conditioning process study of these phenomena was conducted both experimentally and theoretically. Several experiments was performed employing a rotary dryer and a conditioning silo. In each experiment one of the air moisture content was changed and the resulting consumption of steam changed on the process was measured. The objective of this research was to reduce exhaust steam to heated up fresh air to hot air by installing dehumidifier. Evaluation of these results showed that the low humidity of fresh air are well suited for applied of refined sugar drying process, giving the perfect performance in which quality of refined sugar impacted can be eliminated and reduction of energy can thereby improve, with the aim of enhancing energy saving.

Abstract: Heat recovery of low pressure steam in steam condenser of thermal power plant was attractive because of its great economy and environmental value. This paper reported the experimental investigation results on the application of a heat pump water heater (HPWH) using low pressure steam in steam condenser as heat source. The working principles and features of the prototype heat pump were introduced. The effects of various parameters, including water flow rate and inlet temperature of heat pump condenser were investigated. Influence of vacuum pump on HPWH was also discussed. Results show that performance of HPWH is governed strongly by the change of water flow rate and inlet water temperature of heat pump condenser and vacuum pump. Maximum outlet water temperature of the test HPWH is 65°C and the maximum coefficient of performance (COP) is 4.5.