为了研究闭式热源塔冬季无霜工况下传热过程，利用有限差分法建立了闭式热源塔冬季无霜工况下动态传热传质模型。将实验数据对比数值计算结果对比，验证了模型的有效性。误差分析结果表明：溶液出口温度的均方根误差为0.201°C。通过实验与模拟分析了闭式热源塔在机组变负荷运行时的动态换热特性，结果表明：当热泵机组变工况运行时，闭式热源塔作为取热装置可为机组蒸发器提供温度相对稳定的热源；此外，相比传统空气源热泵，闭式热源塔在低温高湿环境下的结霜风险更小，节能潜力更大。

In order to investigate the heat transfer process in closed heat source tower under the non-frosting condition, the finite difference method was adopted to develop the dynamic heat and mass transfer model. Comparing the calculated results with the experimental findings, the root mean square error of the outlet solution temperature is 0.201 °C. Through experiments and simulations, dynamic performance of the closed heat source tower during variable load operation are analyzed, results show that the closed heat source tower, as a heat source, can provide solution with relatively constant temperature for heat pump when working condition changed, in addition, compared with traditional air source heat pumps, the closed heat tower has lower frost risk in the low temperature and high humidity environment.