冻牛分割肉快速预冷的探讨

屠宰后的牛肉胴体经过分割加工,其肉块的中心温度一般在29℃左右,这样的温度正是酶和微生物繁殖的有利条件。因此,为减弱酶的活性,延缓肉的僵直期和微生物在肉体表面的扩展繁殖,必须使肉温在一定的温度范围内迅速下降,将酶和微生物的活力在极短的时间内减弱到最低限度。为此,分割后的牛肉块必须立即送到预冷间进行预冷排酸,待肉块中心温度降至7℃以下后再进行包装冷冻。经过这样预冷的肉块,其肉的色泽和成熟程度都能达到较好的效果。

关于烤鳗车间空调设计探索

本文针对烤鳗生产线上空调设计提出一些具体问题进行探讨，提出一些建议，可供设计时参考。

洋葱贮运保鲜技术

洋葱也叫圆葱、葱头、玉葱,原产中亚(伊朗、阿富汗)和西亚(地中海沿岸),属于百合科葱属,为二年生草本植物.食用部分是肥大的鳞茎,含有较多的蛋白质、糖类、维生素以及多种矿物质,具有特殊的辛辣味.不同的洋葱品种其耐贮运性差异较大.……

用冷却猪分割肉生产火腿肠与罐头之优点

1993年以来,在冻猪分割肉生产旺季,我们根据客户需求,有效地探索出了对生产火腿肠与罐头的厂家供冷却猪分割肉的新路子。条件是在4小时内把进预冷间的猪分割肉冷却,使肉中心温度达0℃～4℃,保证冷却均匀,装在带有无毒塑膜方底袋的塑料周转箱内。用冷藏车在10个小时内运到生产厂家,立即投入火腿肠及罐头生产。其优点如下。

Prediction Model for Cooling of an Electrical Unit with Time-Dependent Heat Generation

The satisfactory performance of electrical equipments depends on their operating temperature. In order to maintain these devices within the safe temperature limits, an effective cooling is needed. High heat transfer rate of compact in size and reliable operation are the challenges of a thermal design engineer of electronic equipment. Then, it has been simulated the transient a three-dimensional model to study the heating phenomenon with two assumption values of heat generation. To control for the working of this equipment, cooling process was modeled by choosing one from different cooling technique. Constant low speed fan at one direction of air flow was used for cooling to predict the reducing of heating temperature through working of this equipment. Numerical Solution of finite difference time domain method （FDTD） has been utilized to simulate the temporal and spatial temperature profiles through two processes, which would minimize the solution errors.