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A semi-experimental method for evaluating frosting performance of air source heat pumps

机译：一种评估空气源热泵磨砂性能的半实验方法

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摘要

Frosting has always been a crucial problem for air source heat pumps (ASHPs) operated in heating mode. Quantitative evaluation of frosting is of vital importance to the development of technologies against frosting. Although frosting maps have been developed in many studies, they are specific for unique systems. To evaluate the frosting performance of arbitrary system, a semi-experimental method, to depict frosting evaluation plot, was proposed in the present study. In the frosting evaluation plot, frosting region was clarified, and the frosting driving forces with the effect air temperature and relative humidity (RH) were evaluated, through theoretical calculation of Gibbs free energy change. After that, experiments were conducted to verify the frosting evaluation plot, and the results demonstrated the present method was feasible. In some experimental cases, the inlet segment of the heat exchanger escaped from frosting but the outlet segment frosted. As implementation of the semi-experimental method, the methodology was utilized to clarify the air temperature and RH ranges causing uneven frosting. In addition, the frosting evaluation plot with impact of air velocity was drawn. The results suggested that, increased air velocity restrained frosting, and reduced the chance of uneven frosting.(c) 2021 Elsevier Ltd. All rights reserved.
机译：糖霜始终是在加热模式下操作的空气源热泵（ASHP）的关键问题。结霜的定量评估对于对糖霜的技术的发展至关重要。虽然在许多研究中已经开发了糖霜地图，但它们特定于独特的系统。为了评估任意系统的结霜性能，在本研究中提出了一种描述糖霜评价图的半实验方法。在结霜评估图中，通过吉布斯自由能量变化的理论计算，评估了冻结区域，并评估了具有效果空气温度和相对湿度（RH）的糖霜驱动力。之后，进行实验以验证结霜评价图，结果证明了本方法是可行的。在一些实验情况下，热交换器的入口区段从磨砂脱落，但出口段磨砂。作为半实验方法的实施方式，使用方法来阐明气温和RH范围，导致冻结不均匀。另外，绘制了具有空气速度影响的结霜评估图。结果表明，增加的空气速度受到束缚，并降低了冻结了不均匀的机会。（c）2021 elestvier有限公司保留所有权利。

著录项

  • 来源
    《Renewable energy》 |2021年第8期|913-925|共13页
  • 作者

    Pu Jihong; Shen Chao; Zhang Chunxiao; Liu Xingjiang;

  • 作者单位

    Harbin Inst Technol Key Lab Cold Reg Urban & Rural Human Settlement E Minist Ind & Informat Technol Sch Architecture Harbin 150090 Peoples R China;

    Harbin Inst Technol Key Lab Cold Reg Urban & Rural Human Settlement E Minist Ind & Informat Technol Sch Architecture Harbin 150090 Peoples R China;

    Harbin Inst Technol Key Lab Cold Reg Urban & Rural Human Settlement E Minist Ind & Informat Technol Sch Architecture Harbin 150090 Peoples R China;

    Harbin Inst Technol Key Lab Cold Reg Urban & Rural Human Settlement E Minist Ind & Informat Technol Sch Architecture Harbin 150090 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Frosting evaluation plot; Frosting driving force; Uneven frosting; Air velocity;

    机译：结霜评价情节;糖霜驱动力;不均匀的糖霜;空气速度;

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