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一、何谓人工制冷与制冷装置?人工制冷的温度范围一般如何划分?冷和热的概念是相对的。通常我们所说的冷,在制冷技术中,是指低于周围介质(水或空气)温度的状况。从日常生活知道,二种不同温度的物体相接触,就会发生传热,并且热量总是从温度较高的物体传给温度较低的物体,直至两物体的温度相等,其传热才停止。热量决不会自发地从温度较低的物体传向温度较高的物体,这是自然界的客观规律。例如,一杯高于周围空气温度的热水放在桌子上,热水的温度就会逐渐下降,一直
First, what is meant by artificial refrigeration and refrigeration device? Artificial cooling temperature range is generally divided? The concept of cold and heat is relative. Generally, what we mean by cold, in refrigeration technology, is the temperature below the ambient medium (water or air). It is known from everyday life that heat transfer occurs when two objects of different temperatures come in contact with each other, and the heat is always transmitted from the object at the higher temperature to the object at a lower temperature until the temperature of the two objects is equalized and the heat transfer stops . It is an objective law in nature that heat will never be spontaneously transmitted from lower temperature objects to objects of higher temperature. For example, if a cup of hot water above the ambient air temperature is placed on the table, the hot water temperature will gradually decrease