基于热网驱动的综合能源新型空气源高温热水机组性能研究

Study on the performance of new air-source high-temperature hot water units driven by heat supply network in integrated energy systems

常规电动热泵应用于寒冷地区能效较低,且溴化锂吸收式热泵机组的蒸发极限运行温度为5℃,因此基于吸收式循环的空气源热泵在我国东北地区零下气温环境中无法工作。提出一种将压缩式循环与吸收式循环进行耦合的创新型低环温空气源热泵,旨在综合能源系统中利用城市热网驱动高效制取高温热水,解决了电动热泵在低温环境中性能差及电费成本高的技术难题。首先分析耦合热泵机组的运行原理,其次对提出的新型热泵机组进行仿真模拟。通过模拟计算得出双相变换热器蒸发温度、热水出口温度、环境温度以及水蒸气压缩机压比对热泵制热性能的影响规律。通过对4种不同工况的理论计算和分析以及与压缩式热泵的对比,验证了所提出新型低温空气源热泵系统具有良好的性能优势和工业应用推广价值。

Conventional electric heat pumps are of low energy efficiency in cold regions.Since the lowest operation temperature of lithium bromide absorption heat pumps is 5℃,they cannot work in sub-zero areas of Northeast China.By coupling compression cycle with absorption cycle,a new low-temperature air-source heat pump is proposed.The pump driven by the municipal heat network in an integrated energy system can produce domestic hot water effectively and solve the problems of conventional pumps'poor performance in cold areas and high electricity cost.The operation principle of the coupled heat pump unit is analyzed,and the proposed new heat pump unit is simulated.The effect of the evaporation temperature of a dual-phase heat exchanger,hot water outlet temperature,ambient temperature and steam compressor pressure ratio on the heating performance of the heat pump is obtained through simulation calculations.Through theoretical calculation and comparative analysis on the compression heat pump and the proposed new low-temperature air-source heat pump under four different working conditions,the high performance and industrial value of the latter pump is verified.