供热空调系统效率计算方法

为了明确供热空调系统的能质利用情况,基于单耗分析理论和方法对供热空调系统的分析进行了进一步的研究和探讨。讨论了几种典型供热空调系统形式(锅炉供热、电热供热、热泵空调、吸收式冷热水机组)的效率计算方法,并总结出效率通式。为表征系统整个运行期的平均效率,提出了两种使供热空调系统的分析方法更为全面的方法(供热/冷量加权温度法和燃料加权法),并结合示例全面分析了基于热力学第一定律的一次能源利用率和基于热力学第二定律的效率,从而更为全面地了解各系统在全工况下的能源(质)利用情况。

The Calculation of Exergy Coefficient for Heating & Air Conditioning System

To further understand the energy quality utilization of air conditioning and heating system,the exergy analysis based on specific consumption analysis was studied.The exergy coefficient computational methods of some typical air conditioning and heating systems(boiling heating,electric heating,heat hump,absorption unit) were studied,and the general formula of exergy coefficient was summarized.To express mean exergy coefficient of the whole season,two mean exergy coefficient computational methods for air conditioning and heating system were proposed: heat weighted temperature method and fuel weighted method,and so the exergy analysis for air conditioning and heating system was improved.By taking the heating in Beijing as an example,the First & Second Law of Thermodynamics based coefficients of typical air conditioning and heating systems were developed,and from these numerical values,the energy(quality) utilization of air conditioning and heating systems in different loads was fully obtained.