摘要
针对空气源热泵热水器运行工况随着加热水温的变化而变化,系统稳定性较难确定,在整个运行过程中存在能效比C_(COP)变化区间较大的问题。采用力控组态软件为数据采集系统,设计并搭建了一套空气源热泵热水器试验台。通过研究系统在变工况下运行时各个参数的变化趋势,分析影响系统稳定性的因素以期改进优化。试验结果表明:在初始条件不变的情况下,随着加热水温的上升,系统的瞬时能效比C_(COPins)不断减小,在加热后期过热度接近0℃时减小幅度加剧。整个运行过程过热度都在不断减小,0℃时压缩机进入吸气带液状态,吸气带液一定程度上改善了压缩机的工作性能,但长时间的吸气带液使蒸发器侧换热一直不充分,反而使系统的运行性能进一步恶化。通过研究系统整个非稳定运行中的变化过程,表明过热度是影响系统效率的主要因素。
Aiming at operating condition of the air source heat pump water heater changing with the change of heating water temperature, poor system stability and the variation range of coefficient of performance too large during the operation. Adopted force control configuration software as the data acquisition system to design and build the air source heat pump water heater test rig. By studying the change trend of each parameter when the system was running under variable operating conditions, analyzed the influence factors of system stability to improve optimization of system performance. The test results show that, under the condition of the same initial eondition, the instantaneous energy efficiency ratio of the system decreases with the increase of the circulating hot water temperature. The rate of decrease of instantaneous energy efficiency ratio increases when the degree of superheat is close to 0 ℃ in the latter stage of heating. The degree of superheat decreases during the operation. The compressor enters the gas-liquid two-phase region when the degree of superheat is 0 ℃. It can improve the working performance of the compressor in a certain extent, but heat transfer of the evaporator side is not inadequate when the gas-liquid two-phase area last for a long time. The running performance of the system is further deteriorated. Superheat is the main factor affecting the efficiency of system from the study of whole instability process.
出处
《轻工机械》
CAS
2017年第3期14-19,共6页
Light Industry Machinery
基金
上海动力工程多相流动与传热重点实验室项目(13DZ2260900)
关键词
空气源热泵热水器
力控组态软件
能效比
瞬时能效比
air source heat pump water heater
force control configuration software
COP （coefficient of performance）
instantaneous energy efficiency ratio
