制冷剂: 是制冷机中的工作流体,它是制冷系 统中为实现制冷循环的工作介质,也 称为制冷工质,或简称工质

(一)课程性质 《家畜繁殖学》是畜牧专业的主要专业基础课。它具有很强的理论性和实践性,与 家畜生殖生理学、家畜产科学、家畜育种学等课程密切相关,通过把这些基础理论与专业 课的有机结合,产生出服务于生产实践的一门新学科。 (二)课程目的和任务 通过本课程的学习,使学生掌握家畜的繁殖生理学的知识,在此基础上了解生殖激 素的种类、性质与机能。并掌握公畜的生理特点与精液的组成等有关内容。通过以 上知识的学习,掌握家畜冷冻精液的制作、胚胎移植技术在现场的应用,以便为生

制冷技术( Refrigerat ion Techno log 是一门研究人工制冷的原理、方法以及如何运用制冷装置获 得低温的科学。 低温是相对于环境温度而言的,从低于环境温度的空间 或物体中吸取热量,并将其转移给环境介质的过程就是制冷 。它是为适应人们对低温的需要而产生和发展起来的

第七章冷藏库 第一节隔热与防潮 第二节冷库热负荷计算 第三节氟制冷系统 第四节氨制冷系统的设计 第五节载冷剂系统设计 第六节装配式冷库 第七节气调冷库 第八节冷库配套设施 第九节冷库的管理

❖干燥机理及生物工业产品干燥的特点 ❖非绝热干燥设备 ❖绝热干燥设备 ❖冷冻干燥及其其他干燥设备

The quality of fresh meat exposed for retail sale is initially judged on its appearance. The presence of exudate or'drip', which accumulates in the container of prepackaged meat or in trays or dishes of unwrapped meat, substantially reduces its sales appeal (Malton and James, 1983). Drip can be referred to by a number of different names including purge loss',press loss'and 'thaw loss'depending on the method of measurement and when it is measured. In general, beef tends to lose proportionately more drip than pork or lamb. Since most of the exudate comes from the cut ends of muscle fibres

The appearance of meat at its point of sale is the most important quality attribute governing its purchase. The ratio of fat to lean and the amount of marbled fat are important appearance factors and another is the colour of the meat. The changes in colour of the muscle and blood pigments (myoglobin and haemoglobin, respectively) determine the attractiveness

The increased application of temperature legislation in many countries. coupled with economic requirements to maximise throughput, minimise weight loss and operate refrigeration systems in the most efficient manner, has created a very large demand for process design data on all aspects of

Thawing has received much less attention in the literature than either chill- ing or freezing. In commercial practice there are relatively few controlled thawing systems. Frozen meat, as supplied to the industry, ranges in size and shape from complete hindquarters of beef to small breasts of lamb, although the major- ity of the material is 'boned-out' and packed in boxes ca. 15 cm thick weigh- ing between 20 and 40kg. Thawing is usually regarded as complete when the centre of the block or joint has

Theoretically, there are clear differences between the environmental con- ditions required for cooling, which is a heat removal/'temperature reduction process, and those required for storage where the aim is to maintain a set product temperature. However, in many air-based systems, cooling and storage take place in the same chamber and even where two separate facil- ities are used, in many cases not all the required heat is removed in the