冷热电联产系统新评价准则研究

A Study of New Evaluation Criteria for Combined Cooling-heating-power Cogeneration Systems

从冷热电联产系统能量梯级利用的本质特征提出了能量梯级利用率的评价准则。该准则由发电、制冷与供热的能量利用率分别乘以不同的权重系数后累加得到。先确定比较的基准点,然后采用层次分析的方法得出基准点各能量利用率的权重系数。对基准点权重系数根据冷热产品温度及环境温度进行修正可得到其它情况的权重系数值。结合实际的联产系统算例,给出了这种评价准则的使用方法,并与原有的评价准则进行分析对比。结果表明,该评价准则具有合理性,可作为冷热电联产系统评价比较的实用方法。

From the intrinsic characteristics of energy stepped utilization of a cooling-heating-power cogeneration system,presented were the criteria for evaluating energy stepped utilization rates.The criteria were obtained by accumulative adding of energy utilization rates of power generation,refrigeration and heat supply,multiplied by various weighting coefficients respectively.The reference point for comparison was first determined and then a layer-by-layer analytic method was adopted to obtain the weighting coefficients for various energy utilization rates at the reference point.Then,the weighting coefficients at the reference point were corrected by using the temperature of the cold and hot product and the ambient temperature to obtain the weighting coefficients under other circumstances.In conjuction with a calculation case of a practical cogeneration system,the method for using the evaluation criteria was given,and an analysis and comparison with the original evaluation criteria were performed.The research results show that the evaluation criteria under discussion feature rationality,thus adequately serving as a practical method for evaluating and comparing combined cooling-heating-power cogeneration systems.