太阳能辅助地源热泵供热运行特性研究

Study on Operation Characteristics of Solar Assisted Ground Source Heat Pump for Heat-supply

介绍了太阳能辅助地源热泵,对其各装置性能进行了研究。分析了地下埋管换热器进出口水温及有、无蓄热水箱对太阳能辅助地源热泵性能的影响。太阳能辅助地源热泵制热性能系数随地下埋管换热器进口水温的升高呈下降趋势,随其出口水温的升高呈上升趋势。随地下埋管换热器出口水温升高,蒸发器传热量增大。当太阳能辅助地源热泵中无蓄热水箱时太阳能集热器的瞬时集热效率高于有蓄热水箱时的瞬时集热效率。就总体效果而言,有蓄热水箱要优于无蓄热水箱,这样可使地源热泵运行更加稳定。

The solar assisted ground source heat pump is introduced, and the performance of its different units is studied. The influence of the water temperature at inlet and outlet of underground pipe heat exchanger and the presence or absence of water tank for thermal storage on the performance of solar assisted ground source heat pump is analyzed. The heating performance coefficient of solar assisted ground source heat pump decreases with increasing water temperature at inlet of underground pipe heat exchanger, and increases with increasing water temperature at outlet of underground pipe heat exchanger. The heat transfer capacity of evaporator rises, as the water temperature at outlet of underground pipe heat exchanger increases. The instantaneous heat collection efficiency of solar heat collector in the absence of water tank for thermal storage in the solar assisted ground source heat pump is higher than that in the presence of water tank with thermal storage. In term of total effect, the presence of water tank for thermal storage is better than the absence of water tank for thermal storage, which makes the operation of ground source heat pump more stable.