利用室内显热预热室外空气的空气源热泵抑霜性能

IF 1.5 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Peng Wei, Zhiwei Wang, Hengli Feng, Sheng Wang, Jufang Fan
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引用次数: 0

摘要

在冬季供暖模式下,当空气源热泵(ASHP)室外换热器的表面温度低于0°C和环境露点温度时,其表面会结霜。这可以降低ASHP单元的性能系数(COP)和加热能力。使用两个大小、方向和结构相同的房间对一种新型ASHP进行了检查。为了测试新型系统的防冻性能,在测试平台室中放置了两个尺寸和规格相同的ASHP,但其中一个包括显热预热装置。通过比较和分析两种ASHP机组的COP、热损失和霜重等现场实测参数,评价了新型ASHP在重、中、轻度霜冻地区的抑霜性能。结果表明,当空气条件为−3.9°C和98.7%(中度霜冻地区)以及3.2°C和96.7%(重度霜冻地区)时,新型ASHP的性能显著提高。与传统ASHP相比,结霜时间从25分钟增加到38.5分钟,除霜热损失减少31.6%–43.7%,霜重减少11.8%–17.4%,COP增加7.4%–13.1%。在低温温和霜冻地区,当气温为−11.8°C,相对湿度为88.8%时,新型ASHP的抑霜效果较差。实际应用受气候影响,ASHP的运行性能会有所不同。不同的ASHP可以用来适应不同地区的天气。新型ASHP在温和气候和霜冻严重地区可以显著抑制霜冻,提高机组的供暖性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Frost suppression performance of an air source heat pump using sensible heat from indoor air to preheat outdoor air
Frost forms on the surfaces of air source heat pump (ASHP) outdoor heat exchangers under heating mode in winter, when the surface temperature of the heat exchanger is lower than both 0°C and the ambient dew point temperature. This can reduce the coefficient of performance (COP) and heating capacity of the ASHP unit. A novel ASHP was examined using two rooms with the same size, orientation, and structure. To test the frost suppression performance of the novel system, two ASHPs of the same size and specifications, but one including a sensible-heat preheating device, were placed in the test platform rooms. By comparing and analyzing field-measured parameters such as COP, heat loss, and frost weight of the two ASHP units, the frost suppression performance of the novel ASHP was evaluated in severe, moderate, and mild frost areas. The results show that when the air conditions were −3.9°C and 98.7% in the moderate frost area and 3.2°C and 96.7% in the severe frost area, the novel ASHP showed significantly improved performance. The frost formation time increased from 25 min to 38.5 min, frost-defrost heat loss decreased by 31.6%–43.7%, frost weight decreased 11.8%–17.4%, and COP increased 7.4%–13.1% compared with those of the conventional ASHP. In the low temperature and mild frost area, when the air temperature was −11.8°C and the relative humidity was 88.8%, the frost suppression effect of the novel ASHP was unapparent. Practical application Affected by the climate, the operation performance of ASHP will be different. Different ASHP can be used to adapt to the weather in different regions. The novel ASHP can significantly suppress frost and improve the heating performance of the unit in the mild climate and frost serious areas.
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来源期刊
Building Services Engineering Research & Technology
Building Services Engineering Research & Technology 工程技术-结构与建筑技术
CiteScore
4.30
自引率
5.90%
发文量
38
审稿时长
>12 weeks
期刊介绍: Building Services Engineering Research & Technology is one of the foremost, international peer reviewed journals that publishes the highest quality original research relevant to today’s Built Environment. Published in conjunction with CIBSE, this impressive journal reports on the latest research providing you with an invaluable guide to recent developments in the field.
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