一种清洁能源与市政热网互补的供热系统设计及模拟研究

北方地区的建筑供暖需求随着城市建筑面积的迅速增长而不断增加,而城市热网改扩建缓慢,供热能力不足,距城区较远的新建及改扩建小区的供暖需求面临挑战,并且供暖带来的高能耗及环境污染问题日益严峻。针对此类问题,提出了将太阳能、空气能与传统市政热网相结合、互为补充的清洁能源与市政热网多能互补的集中供热系统,利用TRNSYS软件建立系统模型,设计系统5种不同的运行模式及相应的运行控制策略,并以石家庄市某新建小区为例进行分析。模拟运行结果表明,在整个供暖季中,运行时间较长的是太阳能辅助双热源(水源)热泵供热模式和双热源(空气源)热泵供热模式,清洁能源的供热比例为82.15%,热泵机组效率高,平均COP为4.06,远高于常规的热泵机组。研究结果可为周边供热能力不足的新建及改扩建小区选择供热系统提供参考。

Design and simulation of a complementary heating system with clean energy and municipal heating network

The demand for building heating in northern China is increasing with the rapid growth of urban construction area. However, the heating demand of new and renovated communities far away from urban areas is facing challenges due to slow reconstruction and expansion of urban heating network and insufficient heating capacity. In addition, the problem of high energy consumption and environmental pollution caused by heating is increasingly serious. To solve those problems, a new multi-energy complementary central heating system is put forward, which combines solar energy and air energy with traditional municipal heat supply network, realizing the multi-energy complement of clean energy and municipal heating network. TRNSYS software is used to establish the system model, five different operation modes and corresponding operation control strategies of the system are established and analyzed, and a new residential district in Shijiazhuang is chosen as an example. The simulation results show that during the heating season, solar assisted double heat source pump(water source) and double heat source pump(air source) have longer running time, the clean energy heating rate is 82.15%, and the average COP of the heat pump units is 4.06, much higher than that of the conventional heat pump units. The research results can be used as a reference for the selection of heating systems for the newly built or renovated residential areas with insufficient heating capacity.