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三、换热设备的精细(火用)分析计算换热设备的简化(火用)分析计算,方法简单,便于采用,只要能满足简化条件,计算误差可达到工程要求。但要指出,简化计算只是给出了换热过程中由于温差传热引起的(火用)损,而由其它不可逆因子引起的(火用)损则一概被忽略。然而,在有些换热设备中,如列管式、套管式、蛇管式等管式换热器,螺旋板式、翅片板式等板式换热器,其它一些(火用)损常常是不能忽略的,若仍然采用前述简化计算方法,便不能满足工程设计、试验校核等
Third, the exergy equipment (exergy) analysis and calculation of heat exchanger equipment simplified (exergy) analysis and calculation, the method is simple, easy to use, as long as to meet the simplified conditions, the calculation error can meet the engineering requirements. However, it should be pointed out that the simplification of the calculation gives only the (exergy) loss due to temperature difference heat transfer during the heat exchange and the exergy loss due to other irreversible factors is ignored. However, some exergy loss often can not be neglected in some heat exchangers, such as tube type, sleeve type, snake type tube heat exchangers, spiral plate type, fin plate type plate type heat exchangers, etc. , If still using the aforementioned simplified calculation method, it can not meet the engineering design, test and verification