基于热指标修正的供热系统调控能力与节能空间综合分析方法

Comprehensive Method for Analyzing Regulation Capacity and Energy-saving Space of Central Heating System Based on Index Correction

实现按需供热是供热系统节能的根本途径。目前,集中供热系统大多以面积热指标估算整网热负荷,然而由于用户类型的多样以及近年建筑围护结构保温性能的提升,系统的实际热负荷往往有所降低。本文提出了供热强度与需热强度的概念,用以修正系统所用的设计热指标,进而建立了一套供热系统调控能力评价与节能空间预测的综合分析方法。在某1200万m^(2)的集中供热系统中进行了方法应用,发现该系统当前所用的设计热指标42 W/m^(2)偏大,建议的修正值为35.4 W/m^(2);该系统具有较好的调控能力,在室外温度低于12℃时即可稳定的按需供热,且供需偏差与室外温度正相关;在不同的设计热指标修正值下,该系统存在0.0377~0.1190 GJ/m^(2)的节能空间,相应的节能率为11.17%~35.27%。

Realizing on-demand heating is the fundamental way to save energy in the heating system.At present,most central heating systems estimate the heat load of the network based on the area heat index.However,due to the diversity of user types and the improvement of the thermal insulation performance of building envelopes in recent years,the actual heat load of the system is often reduced.In this paper,the concepts of heat supply intensity and heat demand intensity were proposed to modify the design heat index used in the system,and establish a comprehensive analysis method of heating system regulation ability evaluation and energy-saving space prediction.The method was applied in a 12 million m^(2)central heating system.It is found that the design heat index of 42 W/m^(2)used is too large,the suggested correction value is 35.4 W/m^(2).The system has a sound regulation ability.When the outdoor temperature is lower than 12℃,it can supply heat on demand steadily,and the deviation between supply and demand is positively correlated with the outdoor temperature.Under different design heating index correction values,the system has an energy-saving space of 0.0377~0.1190 GJ/m^(2),and the corresponding energy-saving rate is 11.17%~35.27%.