Researches on Heat Flow Meter with Own Intellectual Property

In this paper ,the innovational research is based on widely absorbing patents and applied technique at home and abroad and pointing out the disadvantage and ameliorative method of heat/low meter. According to the principle of therrnopile, and the three - dimensional loop wire laying is substituted by new - style plane wire laying. The construction and manufacture of new - style heat flow meter is declared. The new method will facilitate the manufacture and reduce the cost and the high precision feeler is assured by consistent line length, capacitance, resistance and inductance and the cost of determination in present demarcation will be cheaper than traditional feeler of heat flow meter. The high precision energy saving detection instrument is provided for the field of heat energy.     

Sludge Deposition Analysis and Flow Pattern Test on OxidationDitch Integrated A/A/O Technique

To study the velocity distribution rule, the sludge deposition and the energy-optimized distribution of the oxidation ditch, the experiment was processed in a WWTP with A/A/O Oxidation Ditch technology. The study individually focused on the velocity distribution of curved sections in out-ditch by testing three operation conditions of the Oxidation Ditch. The result shows: firstly, the velocity of the first ditch is too large; easily lead to waste of energy, intermittent on/off submerged flow drivers can optimize the energy distribution of the system. Secondly, in the second ditch, the flow pattern in crook ditches were very complex, there existed high velocity outside and low inside. For such situation, it is easy to cause sludge deposit in the inside of the ditch. Finally, in order to improve the problem of sludge deposition, the measures were put forward as follows: installing off-center training in curved sections of the second ditch, adjusting the position of submerged flow driver.     

Experimental Study of Flow and Heat Transfer in Heat Exchanger with Small Channels

The experimental study of the flow resistance and heat transfer characteristics are conducted for water and ethylene glycol solution (66% Wt) flowing in the heat exchanger with small rectangular microchannels . The heat exchanger having the channels of 0.4 mm in width, 2.0 mm in height, and 20 mm in length is heated by a hearing rod at the bottom surface, the upper and two side surfaces are adiabatic. During experiments, the Reynolds number are ranged from 2 to 2 500. The experimental results show that the flow friction factor decreases and Nusselt number increases with increasing Reynolds number for water and ethylene glycol solution. At a fixed Reynolds number, the Nusselt number for ethylene glycol solution with larger Prandtl number is greater than that for water. Meanwhile, the correlations of flow resistance and heat transfer in the heat exchanger with small channels are obtained for engineering application.     

一种植物茎流传感器及其数据采集系统研究

[目的]植物茎流是研究植物蒸腾规律的重要指标,因而需要准确可靠的茎流测量设备作为支撑。[方法]本文基于热消散原理设计了一种插针式植物茎流传感器和基于MCGS软件的数据采集系统。[结果]通过模拟实验对采集系统进行了标定,测得的茎流速度与实际流速之间的误差低于0.01mm/s,表明茎流测量系统具有较高的精度和稳定性;以杨树为被测样本开展了实际测量实验,结果表明：日出后,随着气温的升高茎流速度开始缓慢上升,中午12:00至15点期间达到峰值并保持较高速率,此后茎流速度缓慢下降,日落后19:00左右开始迅速下降并保持较低茎流速率直至次日。[结论]以上实验结果表明该系统能准确反映植株茎流的日变化规律,且稳定性较好,可为植株耗水性及蒸腾规律的研究提供设备支撑。     

Evaluation of Heat Recovery Unit in Air Conditioning System withSeasonal Temperature Effectiveness

Referring Seasonal Energy Efficiency Ratio（SEER）——a method for seasonal performance evaluation of room air conditioners in GB 7725, the Seasonal Temperature Effectiveness was proposed to evaluate thermal seasonal performance of a heat pipe heat recovery unit based on the annual operation data in a shopping mall. And its calculation formula was deduced thereafter. With the case study, it was indicated that seasonal temperature effectiveness of the unit was 66.08% in the winter and 55.43% in the summer, which meant that the system was efficient.     

Pressure Drop and Evaporative Heat Transfer Characteristics of Air-water Bubbling Flow

A new kind of evaporative heat transfer experiment for the cooling process of condensers is conducted. The test coil is immersed in an air-water bubbling layer. The air-water two-phase flow passes through the heating tubes of the coil. Due to the motion of the air bubbles in the water, a thin water film forms on the surface of the heating tubes. As the air bubbles passing by the tubes the water is evaporated into the air. The tubes of coil reject heat to the water film, and the evaporation of the water film then rejects heat to the air bubble stream. This heat transfer mode significantly increases the heat transfer coefficient between tubes and air. The consumption of the power of a water pump can be decreased. Moreover, the airflow rate required is less than that of an air-cooled condenser.The pressure drop of air through air-water bubbling layer and the heat transfer between the tubes and water are experimentally investigated in the paper. The results show that the factors affecting the pressure drop and the heat transfer coefficient involve the pore geometry of sieve plate, the height of the air-water bubbling layer, the air flow rate through the sieve plate and the heat flux of tubes. The heat transfer coefficient between tube and water is two times larger than that of falling film of water on the outer surface of tube.     

热泵技术在温室中的应用

为了探究热泵技术在农业领域可持续发展的应用前景,通过对热泵的发展概况、工作原理以及在各种温室上的应用展开分析探讨。综述了国内近20年的热泵在温室上的应用,研究表明：热泵在温室的应用上存在着一定的地域局限性和环境局限性,而复合型热泵可以通过相互间的取长补短打破这一局限性。因此今后需要将复合型热泵作为重点研究对象,促使热泵在温室上应用更为广泛。热泵系统作为一种节能、高效、环保的新型节能技术,受到大众的青睐,在农业领域的可持续发展有较好的应用前景。     

Experiment and Simulation on Heat Transfer Efficiency of Double pipe Heat Exchanger for River Water source Heat Pump

The river water source heat pump system is an important technique to utilize renewable energy in Chongqing and heat exchanger can influence overall energy efficiency of system obviously. A test was carried out to study the heat transfer efficiency of double pipe heat exchanger with semicircular reentrant tube. It was found that the heat transfer efficiency would increase while curvature of semicircular reentrant tube rose. And when the ratio of R to r was five, heat transfer efficiency for semicircular reentrant tube would be increased 2.5% than that of straight double pipe heat exchanger. Flow, temperature field and heat transfer process of semicircular reentrant tube were simulated with computational fluid dynamics(CFD) tool to study the heat transfer mechanism. The modified RNG κ ε Turbulence Model was adopted to ensure the accuracy of simulation analysis under the situation of rotary flow and great curvature. Thus, it was indicated that there was obvious secondary flow vertex in reentrant tube. And disturbance of vertex on boundary layer was the main reason for which heat transfer efficiency of double pipe heat exchanger would increase as curvature of semi toroidal reentrant tube rose. Based on the experiment and simulation, the recommended curvature for reentrant tube was proposed with the consideration of sediment in river water and heat transfer efficiency of heat exchanger.     

Study on Application of Interrelated Controlling Method for Thermal Environment and Energy Saving in Buildings--Application in Determining the Control Indexes for Heat Insulation and Energy Saving of Enclosure in Bu ildings

In this paper according to the relationships between indoor-outdoor climate parameters, indoor thermal environment parameter and heat insulation parameters of enclosure, the control condition of indoor thermal environment and the control parameters of heat insulation-energy saving are advanced. Prescribing a quality limit for the parameters, the control indexes for the heat insulation energy saving of the enclosure are given.     

Detection and Diagnosis on Plate Heat Exchanger of an Air Conditioning System of a Theatre in Chongqing

A detection and diagnosis has been performed on the bad effect of the central air conditioning system of a theater,and the site test on the actual operating conditions of the plate heat exchanger has also been proceeded. In this paper, based on the correction of the measured heat transfer obtained by actual measurement,the specified logarithmic mean temperature difference heat transfer rate and the specified flow heat transfer has been obtained. By using the specified heat transfer rate as a comparison and regarded as a basis of judging of the performance of plate heat exchanger. Finally, the corresponding recommendations about the actual operation of plate heat exchanger and the steps of the performance diagnostic has been put forward in this article.     

Study on Heat Insulation and Use of Passive Evaporated Roof

According to different construction ways and materials, three kinds of roof, that is ,passive evaporated roof with freedom water surface , water stored roof by means of pore material and hygroscopic roof,are introduced in this paper . Meanwhile the theory of heat insulation and energy efficiency on passive evaporation roofs and suitable weather and places to be used are also discussed .The results show that all kinds of passive evaporated roofs have high efficiency in heat insulation because of water's high specific heat and large quantity of absorbed latent heat,and that they can be adopted according to the practical local weather ,natural resource and economical development.     

Analysis of the Temperature Limit of Dynamic Water Intake of Open loop Surface Water Source Heat Pump Systems

Energy consumption of water intake is one of the key factors for energy saving in the application of the open loop surface water heat pump system. An energy efficiency ratio coupling model for open loop surface water source heat pump systems was established on the basis of the energy consumption model for the water intake and the heat pump units. According to energy saving rate and regulation of energy consumption of water intake, dynamic temperature limits of water intake in different water supply temperature of cooling tower and different pump head were proposed so as to find a calculation method of temperature limits of water intake of open loop surface water heat pumps. Moreover, the energy saving rate of surface water source heat pump systems compared with traditional air conditioning systems under various condition was also calculated.     

隧道式干燥机节能研究现状及展望

介绍隧道式干燥机的节能研究现状。研究将各种节能措施与隧道式干燥机有机结合起来,对不同物料的最佳干燥工艺,以达到最大程度节能降耗的目的。     

安徽农村土地流转状况及探索

近年来，随着中国农业和农村经济的发展，特别是农业产业化经营的兴起和农村劳动力转移的推进，被誉为“第三次土地革命”的土地使用权流转速度明显加快，规模不断扩大，形式多种多样，这是对家庭承包责任制的有益补充和完善，也是中国农业迈向现代化的必由之路。不同的地区有不同的土地流转方式，各地正积极探索土地使用的有效形式，加速土地流转。加入WTO以后，伴随对世贸组织承诺的逐步兑现，中国农业必然要面临由封闭保护转向与他国农业自由竞争的局面。在安徽省出现的土地流转问题对于面临一系列矛盾的农业正是一种积极的探索。通过安徽省调查资料结合全国其他主要土地改革区域的经验及问题利用有关理论观点分析了农村土地流转出现的新情况,对土地流转中出现的问题提出了自己的看法和建议。     

Green Thought on the Energy Saving of Air Conditioning

This paper points out the problems in air conditioning and the urgent need in energy saving. By observations and analyses, it shows that the idea of making use of natural resources to improve the indoor air may date back to ancient times. This paper also examines the feasibility of taking advantage of dry or wet bulb temperature, solar energy, underground rock etc. to regulate the room temperature. Finally, it concludes that the above mentioned old idea has such characteristics as energy saving, low cost and less pollution. Therefore, it is a good green plan in energy saving air conditioning.     

冷藏库的节能途径

介绍了冷库的现实作用和功能特点,论述了冷库的节能方法,对我国冷库的设计与运行管理具有重要的意义。     

Research on Adaptive Control of the Feeding System of WEDM Machine Based on Identifying Machining Status

With rapid development of the civil\institutional\commercial central air conditioning system,the energy consumption problem becomes serious.From the view point of operation and management,this paper provides some measures to save energy through choosing suitable cooling and heating equipments,air handling units,terminal units or designing a better water system.