在节能工作中,有形的、数量上的能量损失,往往容易被人们所注意,而无形的、质量上的能量损失,却往往被人们所忽视。因此,加强对节约热能的质量方面宣传是十分必要的。工矿企业中常把高压蒸气,通过阀门节流降压来加热其它原料,是一种无形的、质量上的损失。从数量上看,节流降压前后的蒸气温度和每公斤蒸气所具有的热量都相同,用节流降压前和降压后的蒸气来加热原料,使达到同样效果,所需蒸气量几乎相同,似乎没有什么损失。但从质量上看,节流降压后,蒸气作功本领降低,相应地热能的品位也降低了,造成了质量上的损失。如果要知道热能在质量上的损失量,必须有一个衡量热能质量的量值。这个量值,在热 In energy-saving work, the tangible and quantitative energy loss is often easily noticed by people, but the invisible and qualitative energy loss is often overlooked. Therefore, it is necessary to step up publicity on the quality of heat conservation. Industry and mining enterprises in the high-pressure steam often, through the valve throttling to heat other raw materials, is an invisible, quality loss. In terms of quantity, the vapor temperature before and after throttling and depressurizing is the same as the amount of heat per kilogram of steam, and the same effect can be achieved by using the steam before and after depressurization to heat the raw material to achieve the same effect, The same, it seems that there is no loss. However, from the quality point of view, after throttling and depressurizing, steam work ability to reduce, the corresponding thermal energy level also reduced, resulting in a loss of quality. If you want to know the quality of heat loss, there must be a measure of the quality of thermal energy. This amount, in heat