吸收式热泵温升的研究

Study on Temperature Rise of Absorption Heat Pump

利用ECSS软件分别对H2O-LiBr第一类吸收式热泵和NH3-H2O第二类吸收式热泵进行了模拟计算,并且探讨了吸收剂浓度和蒸发压力对系统温升和制热温度的影响。结果表明:H2O-LiBr第一类吸收式热泵在冷凝压力和蒸发压力不变的情况下,吸收剂浓度从58%增加到64%,温升从38.7℃增加到39.7℃;NH3-H2O第二类吸收式热泵驱动热源温度为85℃,蒸发压力为1000 kPa,吸收剂浓度从50%增加到80%,温升从19℃增加到46℃。可见增加吸收剂浓度有助于系统温升的提高。同样的思路对蒸发压力进行研究,得出结论:随着蒸发压力的提高,第一类吸收式热泵温升降低,第二类吸收式热泵温升提高。

Type I H2O-LiBr absorption heat pump and type II NH3-H2O absorption heat pump were respectively simulated using ECSS, and the eft^cts of absorbent concentration and evaporation pressure on the system temperature, rise and the beating temperature were discussed. The results showed that in the case of stable condensing and evaporating pressures for the type I H2O-LiBr absorption heat pump, the absorbent concentration increased from 58% to 64%, the temperature rise c.hanged from 38.7 ℃ to 39.7 ℃. For the type II NH3-H2O absorption heat pump, when the temperature of driving heat source was 85 ℃ and the evaporation pressure was 1 000 kPa, the absorbent concentration increased to 80% from 50% and the temperature increased to 46 ℃ from 19 ℃. Thus, the absorbent concentration increasing was benefit to the improvement of system temperature. Evaporating pressure was studied in the same way and the conclusion as follows, with the evaporation pressure increasing, the temperature of type 1 absorption heat pump reduced, and the temperature of type II absorption heat pump improved.