Analysis on cooling load on hot mine

Air stream of hot mines is taken as research object, and energy balance equation is established. Cooling load expressions under five different conditions are derived through strict theoretical derivation, i.e. unsteady multi-stream, steady flow, steady flow ignoring kinetic energy change, steady flow ignoring potential energy change and steady flow ignoring fan power change. Then the enthalpy variable expression of the subsurface moist air and heat calculating process of surrounding rock are deduced. Finally, Yong Chuan coal mine illustrates and summarizes the process of calculation cooling load quantitatively. It is conducive to scientificly manage hot mine and design mine ventilation.     

谷物冷却机环流冷却技术在浅圆仓中的应用研究

本文探讨增加一系列风管和控制机构使浅圆仓冷却通风形成环流状态,通过对谷物冷却作业过程中粮堆热交换后所排出空气进行回收并重复利用,达到节省能源,提高谷物冷却机作业能力和效率的目的,并对该套装置潜在的效益和在低温储粮中的作用进行了评估.     

白煮整鸡的真空冷却工艺研究

研究真空冷却工艺(VC)对白煮整鸡鸡肉品质的影响,并与传统风冷(BC)比较,对其冷却速率、质量损失、细菌总数、色泽及质构进行研究。结果表明,真空冷却速度明显快于风冷,提高冷却速度在4倍以上,但其质量损失增加了3%以上。与风冷相比,真空冷却产品的红度值、剪切力增加,真空冷却可降低产品初始细菌总数,并减缓样品贮藏过程中微生物的增长速度。     

二段冷却与一段冷却对冷却肉损耗的影响

通过对应用一段冷却和二段冷却方法的冷却肉的冷却温度、损耗的测定和比较,得出二段冷却的冷却肉温度下降较快和肉质损耗低的结论。     

国内外冰温保鲜技术研究与应用

综述了冰温保鲜技术产生、发展以及在果蔬、水产品和畜禽肉类产品中的应用现状。     

湿热地区毛细管地板供冷末端性能实测分析

选取重庆某住宅卧室进行实测分析，在供水温度为20、18、16℃，室外天气为晴天、多云、阴天（雨）工况下，研究毛细管地板供冷房间温度、地板供冷量、地板结露特征。供水温度为20、18、16℃时，室内最高温度27.6℃，最大供冷量分别为23、33、32 W/m²。开始结露时间为10：30-14：50之间，其中80%区域开始结露的时段为11：00-13：00之间，室内气流涡旋区最早出现结露。供水温度为18℃时，除湿能明显改变地板结露现象；供水温度为16℃时，除湿能改变大部分地板结露现象，室内气流涡旋区仍为结露区，但结露时间延后1 h以上。地板结露区域与室内气流组织有关，毛细管铺设位置应避开房间气流漩涡区。     

间接冷却系统在葡萄酒发酵及后续冷处理中的设计与应用概述

葡萄酒通过浸渍发酵及后处理工艺进行酿造,低温处理是增加葡萄酒稳定性与品质改良的主要途径。本文介绍了以乙二醇为载冷剂的间接冷却系统的组成、特点、控温工序中的工艺和设备技术参数,概述该系统在酿制优质葡萄酒的控温环节包括葡萄汁澄清、发酵以及后续冷处理工序中的应用,并通过乙二醇间接冷却系统的工艺设计实例和运行效果,说明间接冷却系统在葡萄酒酿制生产中具有良好的推广应用前景。     

THE WAYS FOR IMPROVING INDOOR ENVIRONMENT AND AIR-CONDITIONING SYSTEMS IN DANCLING HALLS

Since 1988, air temperature, humidity, air quality, noise level and intensity of illumination in lots of dancing halls in China have been investigated and tested. This paper introduces the present situation of indoor environment and air conditioning systems in dancing halls of China. The design indexes of cooling load for room and ontside air are recommended. The reasons for indoor environment deterioration have been found out. From the actual situation of China, the ways for imoroving indoor environment and approach of energy conservation in air conditioning systems are explored.     

Heat Transfer Characteristics of a New Ceiling Radiant Cooling Panel with Uniform Temperature Distribution in the Surface

A new ceiling radiant cooling panel(CRCP) with a uniform temperature distribution in the surface was introduced, by analyzing the physical structure and heat transfer mechanism of CRCP. A mathematical model of the radiant heat transfer process was established, through which the cooling capacity of CRCP was calculated using MATLAB. Compared with the results of thermal performance test, the mathematical model was reasonable with a maximum error less than 6%. According to the results of model and experiment, in the constant flow condition, due to the air in the sandwich structure, cooling capacity of CRCP decreases as the temperature drops. Limited by the chilled water temperature, the temperature of CRCP usually is in range of 18~20 ℃. Based on the experimental ,the distribution of relative humidity and the temperature in the room and cold load undertaken by convection and radiation respectively in the room were also studied, aiming at providing some relevant basis for the application of CRCP system.     

控释肥包衣剂的制备及理化性质研究

为了获得控释肥包衣剂的制备条件、探明其理化性质,以2种树脂为成膜材料,探讨了成膜材料复合比、成膜材料用量、增塑剂用量、乳化剂用量等单因素对控释肥包衣剂制备效果的影响,运用正交实验L9(34)确定了控释肥包衣剂制备的最佳条件;并对其pH、粘度、成膜时间、成膜性、衣膜水溶性、包衣均匀度、包衣脱落率等理化性质进行了测定。结果表明,控释肥包衣剂的最佳制备条件：树脂JZ与BZ复合比1:1.5,成膜材料用量12%,增塑剂用量0.8%,乳化剂用量1.0%,色素用量0.08%,乙酸乙酯用量86.12%。理化性质测定结果显示：pH 5.21,粘度为21.1 MPa/s,成膜性良好,衣膜不溶于水,成膜时间为6 min,包衣均匀度95%,包衣脱落率<8%,表明所制备的控释肥包衣剂理化性质良好。     

COOLING LUBRICATION FOR FRICTIONCLUTCH

This paper introduces the principle of a cooling lubrieator with simple structureand low price for the frictionclutch.The lubricator is practical and efficient obviously.Based on theexperiment,a synthetical effect of cooling lubrieation with the oil-rain as its rnain part is presented,and the principle of oil-rain cooling lubrication is also studied in this paper.     

Sharing Rate of Cooling Load of Radiant Terminal Device and Air Supply Terminal Device in Residential Buildings——From the Perspective of Thermal Comfort and Indoor Air Quality

Taking residential buildings as the study objects, for three different residential load types such as low load, medium load, and high load type, indoor thermal environments of different load sharing-rates are simulated, respectively. Indoor thermal comfort and indoor air quality of different load sharing-rates are also analyzed and evaluated. And the appropriate range of cooling load sharing-rates are given from the view of both occupants thermal comfort and occupants health. When ωc (the sensible heat load sharing rate of the radiant terminal device) <0.7, the human thermal index in work region can be controlled within the range of thermal comfort standard. From the point of avoiding local discomfort, ωc is suggested to take 04~1. As regard to indoor air quality, for the constant air volume mode, ωc is suggested to take 0.5~0.9 under low and middle load conditions, and ωc is suggested to take 0.35~0.6 under high load conditions. For the variable air volume mode, the smaller the value of ωc is, the better indoor air quality is.     

Expression of dormancy in a spring wheat cross grown in field and controlled environment conditions

Pre-harvest sprouting resistance in white-seeded wheat, Triticum aestivum L. is a genetically complex trait that varies with environmental conditions. Such variation causes difficulty in phenotypic characterization of populations to study inheritance or develop suitable DNA markers. To minimize random environmental effects, we evaluated controlled environments to measure dormancy. A population of 380 doubled haploid lines, AC Karma/SC8021V2, was evaluated in the glasshouse where the developing grains would not be exposed to moisture and greater consistency in temperature could be achieved. AC Karma is sprouting susceptible and SC8021-V2 is sprouting resistant. The population plus eight checks were seeded in early spring so the plants would reach physiological maturity under long days, requiring less supplemental light, and when the external temperature would be low enough that it would not cause difficulty in cooling the glasshouse. An alpha-lattice in a randomized complete block design with three replications was used. The blocks were arranged to minimize the environmental sources of variability in the glasshouse within each block. A sub-set of this population was tested in six field environments. Dormancy was characterized by germination of seed harvested near physiological maturity, from which a germination resistance index was calculated. The dormancy expressed in the glasshouse was significantly correlated with five of six field environments and highly significant in two of these. There was significant bidirectional transgressive segregation in both field and glasshouse environments. We are currently repeating this glasshouse experiment to confirm the results.     

粮食气调储藏技术的优势及应用前景

主要叙述了气调储藏技术的原理、方法、应用于粮食存储的优势,以及我国粮食气调储藏技术研究应用情况、存在不足和今后发展前景,旨在促进这一绿色储粮保鲜技术得到不断完善和更好地推广应用。     

节能空调模式在粮仓中的应用初探

分析了粮食储藏的环境要求,提出了冰蓄冷空调技术、地源热泵技术、太阳能制冷技术、蒸发冷却技术等在粮仓中应用的可行性,并结合相关系统图或原理图,在省电、节能的背景下,指出了粮食储藏技术今后的发展方向。     

谷物冷却器低温储粮试验报告

利用集制冷和通风于一体的谷物冷却器对砖筒仓和钢板仓储藏的小麦、玉 米和稻谷进行冷却通风度夏试验。结果表明：对于高大、密闭条件好的筒仓,经一次冷却 通风后即可使储粮安全过夏。可达到延缓储粮品质陈化、控制虫霉危害的目的。同时,可 比人工倒仓节约大笔费用和人力,收到了良好的社会效益和可观的经济效益。     

谷物冷却技术处理立筒仓存粮发热问题研究

利用谷物冷却技术解决立筒仓存粮发热问题,通过对多个立筒仓发热玉米的降温处理,证明该方法具有良好降温效果和显著经济效益。     

小麦降温保水通风试验

选取两栋条件相同的高大平房仓,分别采用离心风机和轴流风机在冬季对库存小麦进行降温通风试验,并对通风前后的粮食温度、水分变化情况进行比较,同时分析两种通风方式的经济效益。通过试验研究得出,冬季在我国北方地区,可适时利用轴流风机对储存粮食进行降温保水通风,既可减少因通风所产生的粮食水分损耗,提高经济效益,又可以达到较理想的降温目的。