One Dimensional Steady Model for Natural Ventilation of Solar Chimney

Solar chimney is effective to enhance the natural ventilation by heating the air with solar radiation. Based on the research by other authors, a revised mathematical model is proposed. One dimensional heat conduction model is proposed when the thermal resistance of both the glass cover and heat absorbing wall are taken into account. The mean temperatures of the air and heat absorbing wall, the air mass rate and heat collection efficiency in the solar chimney are calculated with the present model. The results of the present model are compared with the related experimental data and reasonable agreement is validated. It is shown that the present revised model is able to predict the temperatures of the air and wall, the air mass rate and heat collection efficiency more preciously than the original model.     

A Theoretical Study on Thermal Dynamics Model and the Dehumidification Capacity of Hybrid Desiccant Cooling System with Condensation Heat Recovery

The structure and energy conservation characteristics of hybrid desiccant cooling system with condensation heat recovery are introduced briefly. Based on the first and second law of thermodynamics, a system thermodynamic model is established and the solution process given in a diagram. The dehumidification capacity is calculated under different exergy efficiency and indoor sensible heat conditions. The calculation results show that the desiccant wheel barely can compensate for the humidity load of outdoor air under with a ventilation rate of providing fresh air once per hour; when the fresh air rate of ventilation is limited to 0.5 times per hour, however, the desiccant wheel possess sufficient capacity under relatively large wheel exergy efficiency and high sensible heat load.     

5HRT—8型果蔬全自动太阳能热泵组合干燥设备研制与试验

为了充分利用太阳能和空气热能,加快新疆果品产后制干加工的发展,研制了一种太阳能与空气源热泵组合干燥设备,该机利用太阳能和空气热能为热源,可完成果品和蔬菜的干燥加工。介绍了该机的工作原理、主要工作部件结构特点,并进行了无核紫葡萄的干燥试验。     

The Influence of Air Inlet on Ventilation Effect in Indoor SubstationTransformer Rooms

Ventilation design is the difficulty of transformer room design. Temperature field and velocity field in a transformer room was simulated by CFD method . By comparing simulation value with the experimental value in related document , the effectiveness of the mathematical model was verified. Based on it, an indoor substation transformer built was taken as the simulation object, then designed and simulated six kinds of ventilation condition by changing the location and area of air inlet, focused on the influence of air inlet on the ventilation effect by comparing the temperature field ,velocity field and temperature characteristic value in different condition. The simulation results show that when air inlet area is fixed, the air inlet should be arranged in the radiator side and its center height should be controlled in the radiator center height or slightly offset position, it should not be higher than the radiator. When the air inlet location is fixed, air inlet area should be increased along the high direction to improve ventilation effect. The conclusions can provide technical support for the ventilation design of transformer room.     

Evaluation and Analysis of Bacteria Pollution in Dwelling Indoor Air

Tests and study were carried out on indoor air bacteria pollution in dwelling house inChongqing city. Based on the data of measured bacteria concentration of the indoor air,the reasons for indoor air pollution were analyzed. Ith was found that the bacteria seriously polluted the indoor air. The main factors influencing the indoor air bacteria pollution are moisture, natural ventilation and lighting conditions. The construction forms and decoration of the dwelling house are the secondary reasons for indoor air bacteria pollution. Measures and suggestions of preventing the indoor air bacteria pollution and improving the indoor air quality and environmental quality were presented.     

Numerical analysis of Natural Ventilation in Built-in Photovoltaic-Trombe Wall

The natural ventilation in a novel built-in photovoltaic-Trombe wall (BiPV-TW) was numerically simulated by CFD method. The effect of solar radiation, channel width and height on the air flow pattern and ventilation rate was analyzed. Results show that the solar radiation, channel width and height influenced the ventilation rate remarkably. As the solar radiation and BiPV-TW height increased,the ventilation rate increased. As the channel width increasing from 0.1 m to 0.4 m, the ventilation rate monotonously increased. However, when the channel width exceeded 0.5 m, the reverse flow was formed in the top zone and the ventilation rate decreased. A maximum air volume flow rate was achieved when the channel width was approximately equal to 0.4 m in a 3 m height model. The channel width was the dominant factor that influenced the flow pattern in the channel. When the channel width was smaller than 0.4 m, the airflow was thermally stratified laminar flow. When the channel width exceeded 0.5 m, thermally stratified flow disappeared due to the reverse flow formed in the top zone and the laminar flow became turbulent.     

Plan Design Strategy for Isolated House Based on Predominance Score

Plan design of residential building is usually based on intuition,so there are often shortcomings in room orientation,natural lighting,ventilation and energy saving,causing some problems in its function.A concept of Predominance Score is suggested for different locations of the building according to the room orientation,natural lighting,ventilation and energy saving.Based on the low-density characteristics of isolated house,the suggested Predominance Score(PS) is assigned to each specific zone based on room orientation,amount of natural lighting sources and number of inner walls etc.Then,the plan design is carried out according to the order of PS.This strategy will help architects to make decision on technical analysis rather than on intuition.A case study shows the validation of the suggested strategy.     

不同中心集风管形式对浅圆仓降温通风效果的模拟研究

在CFD数值模拟技术的基础上，对浅圆仓不同中心集风管形式下的径向通风降温数值模拟结果分析，并进行对比以评判优劣。研究的粮食种类为大豆，数值模拟了四种变径形式的中心集风管顶部，或开孔或不流通，共八种情况的通风条件下，粮堆内部温度分布和气流组织情况，将八种情况下的数值模拟结果对比，分析其通风均匀性和通风降温速率。研究发现，集风管高度与粮面平齐且上粗下细时有较为明显的优越性，通风均匀性较好。研究结果对浅圆仓仓储大豆通风降温方式的选择提供了理论依据。     

Ventilation regulating methods adapting by climate for residential housing

To study the climatic control strategies of the residential building indoor acceptable thermal environment, firstly, based on adaptive model, integrated indoor activities, clothes and spot investigation on air velocity of residential building, this paper calculates an acceptable temperature range. Secondly, through state-space techniques, common passive regulating technologies in residential building have been simulated, including different ventilation rates and divided-period setting ventilation effect on indoor temperature. Meanwhile, monthly regulating methods for ventilation have been proposed. Thirdly, through ventilation technology, effective regulating zone of outdoor climate parameters have been analyzed, which is combined with hythergraph of outdoor temperature, humidity, solar radiation and air velocity. Taking the characteristics of the human thermal comfort adaptability into consideration, the energy-saving potential of the study results is also analyzed.     

Rent Revenue Analysis of Domestic "House Bank"

House Bank" is a new mode of house tenancy, in which the rent income in free-rent period is the primary revenue source. The rent income in free-rent period mainly depends on values of house rent and free-rent period and leasing house quantity. In this paper, the rule of in-and-out house quantity variation in a given period is analyzed. It demonstrates that the probability of in-and out quantity of house in a period meets the four characters of Poisson distribution and consequently this probability meets the Poisson distribution. Based on the characters of Poisson distribution, in this paper, the rent revenue of "House Bank" is analyzed and the way to find reasonable free-rent period is discussed.     

主动式冷梁热工性能仿真模型及实验验证

以无限空间射流理论和表冷器换热理论为基础,对主动式冷梁的工作原理进行了分析。在假设条件下,建立了诱导送风模型和干工况表冷器换热模型。结合这两种模型,最终建立了主动式冷梁工作模型。在设定的5种静压箱静压值下,对主动式冷梁样品的一次风量、二次风量、水侧换热量等热工参数进行测试。选取诱导比和制冷量两个表征冷梁性能的参数作为标准,对模型理论值与样品实际值进行了一致性与差异性分析,验证了所构建的主动式冷梁模型。     

葡萄贮藏保鲜库管理关键技术

贮藏库管理技术在葡萄果实贮藏中起着极其重要的作用.介绍了葡萄贮藏库管理中的消毒灭菌、入贮预冷、包装箱码垛、贮藏温湿度、通风换气和葡萄进出库等各环节的关键技术要点,为葡萄贮藏生产管理提供参考借鉴.     

DESIGN OF THE VENTILATION SYSTEM WITH FANS SPACED IN SERIES

A method for designing the auxiliary ventilation system for long drivages with multiple fans spaced in series in long duels is proposed based on the criterion that no recirculation takes place between the air flowing in the duct line and the surrounding air, A recurrence method is also given to calculat the leakage and the resistance lose of the duct taking into account of the relationship among the pressure, resistance and the leakage of the duct. The calculating results show that the present method is belter than the other methods.     

Operational Parameters of Hybrid Radiant Cooling Floor and Displacement Ventilation Air Conditioning System

The simulation model of hybrid radiant cooling floor and displacement ventilation air conditioning system was built and analyzed by software EnergyPlus. By comparing the simulation results and experimental data, it is shown that the simulated indoor air temperature and cooling capacity provided by radiant floor was ±7% deviated from the experimental data. Based on the model, with the change of supply air parameters or supply water parameters, the cooling capacity provided by radiant floor and displacement ventilation, surface temperature of radiant floor, indoor air average temperature, AUST temperature were obtained. Combined with the indoor thermal comfort model, when indoor thermal comfort index PMV varied between -0.5 and 0.5, the recommended supply air and supply water parameters were obtained to provide reference for engineering design and application.     

辅材参数对酯类香料在卷烟中转移行为的研究

为研究卷烟辅材参数对酯类香料在卷烟中转移行为,采用同时蒸馏萃取及气相色谱仪对酯类香料进行分析,通过改变辅材参数研究酯类香料在烟丝及烟气中分布影响。结果表明,①影响酯类散失率各因素的主次关系为接装纸打孔排数>接装纸打孔个数>成形纸透气度>接装纸打孔距离>接装纸透气度;②影响酯类香料转移率各因素的主次关系为接装纸打孔排数>接装纸透气度>成形纸透气度>接装纸打孔距离>接装纸打孔个数;③综合酯类物质在卷烟中分布情况,接装纸打孔排数2排,接装纸透气度200 CU,接装纸打孔个数8个,成型纸透气度6 000 CU,接装纸打孔距离18 mm,为外加酯类香料卷烟最佳辅材工艺参数。     

Improvement upon the Formulas for Solar Position in Analysis of Sunlight Distribution in Buildings

The application of existing formulas to determine solar altitude and azimuth angles is inconvenient and inadequate. To improve the existing formulas, a new timing system named the Radiation Calendar was established. In this system the angles' ranges were redefined, making the angles calculated from the improved formulas single valued and varying with hour angle. Representative curves of solar altitude and azimuth angles varying with hour angle were plotted. The mathematical distinctions of these curves astronomically and geographically describe some rules of solar position varying with time, which proves the validity and generality of the improved formulas. The results calculated using the improved formulas show simply and clearly the daily and annual variation of solar altitude and azimuth angles, which are valuable in the work of sunlight distribution analysis related to the design of buildings, air conditioning systems and structures.     

Experimental Study of a Passive Dehumidifying Solar House

On the basis of saving energy, protecting environment, strategy and efficiency, in this paper, the advantage of passive dehumidifying solar house over other traditional dehumidifying systems are expounded. The high humid environment affects not only the thermal comfortableness of indoor people, but also the indoor sanitary condition, human health, indoors electrical equipment and life span of the furniture. This paper presents a passive dehumidifying solar house, the dehumidifying body can be regenerating evaporation by solar energy; new dehumidifying equipment is designed to reduce relative humidity. It is proved that the new dehumidifying body has a very good dehumidifying effect. It will be widely used in some districts.     

The Passive Dehumidifying Solar House

This paper presents a passive dehumidifying solar houase(PDSH),with combination of the Trombe wall and the dehumidifying air layer.For the envelopment of PDSH a porous slab with salt soluiton is inserted into the air layer of Trombe wall.This slab can absorb moisture at inner side and release moisture at outer side.The PDSH wall can dehumidify the room during the outer air layer open in summer and have heatstoring during the outer air layer shut in winter.It is an important character for the Trombe wall.So,the PDSH wall can be applied to insulation and heatstore,or dehumidifying and cooling.Therefore,the PDSH wall can be adopted everywhere in the world.     

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.     

ON THE RELATION BETWEEN THE ROTATION RATE AND NOISE LEVEL FOR BKY63-11 MINE AXIAL AUXILIARY FAN

The noise of mine axial auxiliary fan is comprised of many noise sources. In this paper, a synthetic analysis mode between the speed of revolution and A-weight noise level for BKY63-11 mine axial auxiliary fan is presented and is proved to tally with the actual situation by test.Meanwhile, the maine noise source of axial auxiliary fan is analysed.