空气源热泵用于低温热水地板辐射供暖系统的模拟研究

Simulation Research on Low Temperature Hot Water Floor Radiant Heating System with Air Source Heat Pump

低温热水地板辐射供暖具有舒适、节能和节省空间等优势。空气源热泵以其高效、稳定及其与前者的良好匹配性被认为是低温热水地板辐射供暖系统的理想热源。空气源热泵与地板辐射供暖系统相结合能充分利用围护结构及地板各构造层等蓄热体的蓄热特性,减小环境温度变化对空气源热泵制热性能的影响。本文利用TRNSYS和EES软件建立某高层建筑以空气源热泵为热源的低温热水地板辐射供暖系统的瞬态仿真模型,模拟结果与文献报道的实验数据取得了较好的一致性。基于地板辐射供暖系统的蓄热特性,本文提出电力负荷波峰波谷分时段运行控制策略,可避开空气源热泵运行的不利工况以提高制热效率。针对波峰波谷分时段运行及全波谷运行这两种模式,比较供暖房间温度及运行费用的模拟结果表明,波峰波谷分时段运行模式优于全波谷运行模式。

Low temperature hot water floor radiant heating has advantages of being comfortable and saving energy and space. The air source heat pump is believed to be an ideal heat source of the low temperature hot water floor radiant heating system because of its high-efficiency, stability and good matching with the floor radiant heating system. The combination of air source heat pump and floor radiant heating system may make full use of the heat storage capacity of the enclosure and each structural layer of the floor, which reduces the influence of environment temperature changes on the heating performance of the air source heat pump. In this paper, a transient simulation model of low temperature hot water floor radiant heating system with an air source heat pump for a high-rise building was developed by using TRNSYS and EES software, and it has a good agreement with the reported experimental data. Peak and off-peak intermittent running control strategy was presented here based on the heat storage properties, which can improve the heating efficiency through avoiding bad working conditions of the air source heat pump. By comparing the heating room temperature and operation cost of two kinds of operation modes, i.e., peak and off-peak intermittent operation and off-peak running, the former is better than the latter.