三种空调用制冷机的火用经济性分析与比较
Exergy economy analysis and comparison of three kinds of refrigerating machines used in air conditioning systems
摘要：
利用火用成本方程，建立了制冷机火用经济性分析的模型，并结合北京地区旅馆类建筑空调系统的实例，分析比较了蒸气压缩离心式、双效溴化锂吸收式、直燃溴化锂吸收式三种不同制冷机的火用经济性。分析结果表明，从有效能的利用和经济性角度考虑，虽然溴化锂吸收式制冷机不省能，但经济性较好。其中存在价格因素，在现行价格体系下，单位燃料动力的火用成本，煤炭是电力的1/10。这也说明当前我国的能源价格不合理，特别是电力价格相对于煤炭价格过高。
Abstract：
Using the exergy cost equation, establishes a model of exergy economy analysis for refrigerating machines. Combined with an air conditioning system of a hotel in Beijing area, compares the exergy economy among the vapor compression refrigerating machine, double-effect lithium-bromide absorption-type refrigerating machine and direct-fired lithium-bromide absorption-type refrigerating machine. The results show that the economy of lithium-bromide absorption-type refrigerating machine is better though it can not save energy. There being price factor, in current pricing structure, exergy cost of unit fuel power for coal is one-tenth that of electric power, which indicates that present energy price in China is irrational, especially the price of electric power is over high compared with that of coal.
Keywords:refrigerating machine, exergy economy, exergy efficiency, exergy cost