An experimental study on frosting and defrosting performances of a novel air source heat pump unit with a radiant-convective heating terminal
An experimental study on frosting and defrosting performances of a novel air source heat pump unit with a radiant-convective heating terminal
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新型辐射对流供热终端空气源热泵机组结霜除霜性能实验研究
DOI：
10.1016/j.enbuild.2017.12.035
复制
发表时间：
2018-03
影响因子：
6.7
通讯作者：
Shun Huang
中科院分区：
文献类型：
--
作者：
Long Zhang;Jiankai Dong;Yiqiang Jiang;Shiming Deng;Shun Huang
当室外空气温度较低、相对湿度较高时，空气源热泵机组的室外盘管会结霜，严重影响机组的供热性能。此外，由于室内风扇是封闭的，并且传统的室内盘管中存储的能量不足，所以常用的制冷方法（逆循环制冷）的制冷性能较差。另一方面，传统的基于强制对流换热的室内盘管可能会引起强烈的通风感觉和干眼症，使用户感觉不如辐射供暖终端舒适。因此，为了提高系统的换热性能，结合传统室内盘管和辐射供暖终端的优点，联合收割机开发了一种新型的辐射-对流供暖终端，并将其与空气源热泵机组集成。实验结果表明，在66 min结霜时间内（空气温度为2.0 °C，相对湿度为84.0%），辐射板表面温度、新型加热终端出口空气温度和系统COP的平均值分别为36.6 °C、29.4 °C和2.78。此外，在整个结霜期间，辐射加热量与自然对流加热量和强迫对流加热量的比值保持在1.5：1.0：7.4左右。实验结果表明，该新型加热终端能够为太阳能电池提供充足的能量，并能通过太阳能电池的辐射换热和自然对流换热为空间供暖提供一定的能量。停温期和复温期分别为105和65 s。
When the outdoor air temperature is low and relative humidity is high, frost will occur and accumulate on the outdoor coil of an ASHP unit, which may decrease the heating performances of the ASHP unit to a large degree. In addition, the defrosting performances of the commonly used defrosting method (reverse cycle defrosting) are poor due to the closed indoor air fan and insufficient energy stored in a conventional indoor coil. On the other hand, the conventional indoor coil based on forced convective heat transfer may cause strong draught sensation and dry eye problem and make users feel less comfortable than radiant heating terminals. Therefore, to improve the system defrosting performances and combine the merits of the conventional indoor coil and those of radiant heating terminals, a novel radiant-convective heating terminal was developed and integrated with an ASHP unit. The frosting and defrosting performances of the novel system were experimentally investigated, and the results showed that the average values of radiant panel surface temperature, outlet air temperature for the novel heating terminal, and system COP were 36.6 °C, 29.4 °C, and 2.78, respectively, during a 66-min frosting period (air temperature is 2.0 °C and relative humidity 84.0%). In addition, the ratio of the radiant heating capacity to natural convective heating capacity to forced convective heating capacity remained at around 1.5:1.0:7.4 during the whole frosting period. Furthermore, the experimental results demonstrated that the novel heating terminal could provide sufficient energy for the defrosting, and some energy could be provided for space heating through radiant and natural convective heat transfer during defrosting. The defrosting and resuming heating periods were 105 and 65 s, respectively.
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DOI：
10.1016/s0140-7007(01)00031-7
发表时间：
2002-06
期刊：
International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
--
作者：
T. Nishimura
通讯作者：
T. Nishimura
DOI：
10.1016/j.ijrefrig.2015.10.017
发表时间：
2016-02
期刊：
International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
--
作者：
O. Gustafsson;C. Teuillières;Henrik Hellgren;M. Axell;J. Dalenbäck
通讯作者：
O. Gustafsson;C. Teuillières;Henrik Hellgren;M. Axell;J. Dalenbäck
影响因子：
6.4
作者：
G. Mader;C. Thybo
通讯作者：
G. Mader;C. Thybo
DOI：
10.1007/978-3-319-04681-5_38
发表时间：
2014
期刊：
--
影响因子：
--
作者：
A. Koca;Zafer Gemici;K. Bedir;Erhan Böke;B. B. Kanbur-B.;Yalcin Topacoglu
通讯作者：
A. Koca;Zafer Gemici;K. Bedir;Erhan Böke;B. B. Kanbur-B.;Yalcin Topacoglu
影响因子：
1.7
作者：
Dong Jiankai;J. Yiqiang;D. Shiming;Yao Yang;Qu Minglu
通讯作者：
Dong Jiankai;J. Yiqiang;D. Shiming;Yao Yang;Qu Minglu