The CO₂ air source heat pump (ASHP) has been widely used for space heating and domestic hot water because of its energy saving, high efficiency and environmental protection. However, when used for space heating, the high return water temperature causes higher throttle loss, which results in the energy efficiency of the system obviously decreasing. To solve this problem, a CO₂ ASHP integrated with thermal energy storage (TES) is proposed in this paper. A simulation model of the system was established by TRNSYS software, and the operating characters of the studied system were investigated under the typical daily operating conditions. Additionally, its performance was compared with the benchmark system. This research shows that the average unit COP of the studied system was increased by 14.1 % compared with the benchmark system. It indicates that TES is beneficial for promoting CO₂ heat pump application in cold areas.

CO ₂空气源热泵（ASHP）节能，高效，环保，已被广泛用于空间供暖和生活热水。但是，当用于空间供暖时，较高的回水温度会导致较高的节流损失，从而导致系统的能源效率明显下降。为了解决这个问题，CO ₂本文提出了集成有热能存储（TES）的ASHP。利用TRNSYS软件建立了系统的仿真模型，研究了该系统在典型的日常运行条件下的运行特性。此外，将其性能与基准系统进行了比较。这项研究表明，与基准系统相比，所研究系统的平均单位COP增加了14.1％。这表明TES有利于促进寒冷地区CO ₂热泵的应用。