Modeling of transient characteristics of an air source heat pump with vapor injection during reverse-cycle defrosting.
Modeling of transient characteristics of an air source heat pump with vapor injection during reverse-cycle defrosting.
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DOI：
10.1016/j.ijrefrig.2017.12.017
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发表时间：
2018-04
期刊：
影响因子：
--
通讯作者：
Hongtao Qiao;V. Aute;R. Radermacher
中科院分区：
文献类型：
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作者：
Hongtao Qiao;V. Aute;R. Radermacher
深入的文献综述表明，由于空气源热泵的物理基础复杂，计算细节繁多，目前对其除霜动力学的建模研究还很少。为了弥补这一研究空白，本文首先提出了一个五级热气除霜模型，并将其融入到分布参数热交换模型中，并结合乔等人提出的一个详细的霜层生长模型。(2017年)。然后提出了数值处理来平滑不同除霜阶段之间的不连续过渡，从而显著地提高了数值稳健性。所开发的模型和乔等人所描述的组件模型。(2015A)建立了空气源闪蒸水箱蒸汽喷射(FTVI)热泵系统模型。对反循环除霜过程中系统的瞬时流动和换热现象进行了动态模拟。提供了所产生的物理过程的详细描述。模拟结果表明，融霜所需能量占制冷剂总供能的17.7%，与已发表的典型除霜效率实验数据一致。
A thorough literature review indicates that there is a dearth of modeling studies on the defrosting dynamics of air source heat pumps (ASHPs) due to the complex underlying physics and numerous computation details. In an effort to bridge the research gap, this paper first presents a five-stage hot-gas defrost model which is incorporated into a distributed-parameter heat exchange model integrated with a detailed frost growth model proposed in Qiao et al. (2017). Numerical treatments are then proposed to smooth the discontinuous transition between different defrosting stages, resulting in a significant improvement in numerical robustness. The developed models and the component models described in Qiao et al. (2015a) are applied to construct the system model of an air source flash tank vapor injection (FTVI) heat pump. A dynamic simulation is conducted to explore the transient fluid flow and heat transfer phenomena of the system during the reverse-cycle defrosting (RCD). A detailed description of the resulting physical processes is provided. The simulation results indicate that the energy used to melt the frost accounts for 17.7% of the total energy supply from the refrigerant flow, which is consistent with published experimental data for the efficiency of a typical defrosting process.