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本文针对普通空气源热泵系统在冬季使用时存在的制热量衰减、室外机易结霜等问题,提出了以地道风作为空气源热泵低位热源的方案。首先,利用CFD模拟软件对冬季地道内空气与土壤的换热过程进行了数值计算,并从理论上证明了基于地道风的空气源热泵系统在冬季运行时不存在结霜问题。而后,对基于地道风的空气源热泵机组进行了冬季性能测试。结果表明,与普通空气源热泵系统相比,基于地道风的空气源热泵系统在冬季运行时的制热量和性能系数都有显著的提高,且室外空气温度越低,增幅越明显,尤其在温度极低的情况下,系统的应用优势更加显著。
In this paper, aiming at the problems such as declining heating capacity and easy frosting of outdoor unit when using common air source heat pump system in winter, this paper puts forward the scheme of using the local wind as the low heat source of air source heat pump. Firstly, CFD simulation software was used to calculate the air and soil heat transfer processes in winter tunnels. It is theoretically proved that the air source heat pump system based on tunnel air has no frost during winter operation. Afterwards, the winter performance test was conducted on the air source heat pump unit based on the authentic wind. The results show that compared with common air source heat pump system, the air source heat pump system based on tunnel air has a significant increase in heating capacity and coefficient of performance when operating in winter, and the lower the outdoor air temperature is, the more obvious the increase is, especially at the temperature Under very low circumstances, the application of the system is more significant.