缓冲水箱容量对低环境温度空气源热泵机组性能的影响
Effect of buffer tank capacity on performance of air-source heat pumps at low ambient temperature
摘要：
在空气源热泵机组性能检测实验室，对2 205、3 675 kW空气源热泵分别采用直供形式、增设100 L缓冲水箱、增设150 L缓冲水箱的性能进行了实验，探究了增设不同容量缓冲水箱及不同运行模式对热水型空气源热泵运行性能的影响。结果表明：在-6 ℃环境温度工况下，3 675 kW机组增设100、150 L缓冲水箱较直供形式，制热量分别下降9.6%、10.2%，COP分别下降9.5%、9.9%；2 205 kW机组增设100 L缓冲水箱后制热量下降6.3%，COP下降7.0%。较连续运行模式，间歇运行模式2在直供、增设100 L水箱、增设150 L水箱3种情况下，机组制热量分别提升2.5%、4.5%、5.0%，COP分别提升1.8%、3.7%、4.5%。
关键词： 空气源热泵；缓冲水箱；容量；低环境温度；间歇运行；制热量；性能系数（COP）
Abstract：
In the performance testing laboratory of air-source heat pump units, the experiments are carried out on the performance of 2 205 kW and 3 675 kW air-source heat pumps with direct supply and 100 L and 150 L buffer tanks respectively to explore the effects of adding different capacity buffer tanks and different operation modes on the operation performance of hot water air-source heat pumps. The results show that when the ambient temperature is -6 ℃, the heating capacity of the 3 675 kW unit adding 100 L and 150 L buffer tank decreases by 9.6% and 10.2% than that of the direct supply, respectively, and the COP decreases by 9.5% and 9.9%, respectively. After the addition of a 100 L buffer tank, the heating capacity of the 2 205 kW unit decreases by 6.3% and COP decreases by 7.0% compared with the direct supply. Compared with the continuous operation mode, the heating capacity of the intermittent operation mode 2 in direct supply, adding 100 L and 150 L buffer tank increases by 2.5%, 4.5% and 5.0%, respectively, and the COP increases by 1.8%, 3.7% and 4.5%, respectively.
Keywords:air-source heat pump; buffer tank; capacity; low ambient temperature; intermittent operation; heating capacity; COP