An experimental investigation on a novel WWSHP system with the heat recovery through the evaporation of wastewater using circulating air as a medium
An experimental investigation on a novel WWSHP system with the heat recovery through the evaporation of wastewater using circulating air as a medium
复制标题
以循环空气为介质通过废水蒸发回收热量的新型WWSHP系统的实验研究
DOI：
10.1016/j.enbuild.2019.03.023
复制
发表时间：
2019-05
影响因子：
6.7
通讯作者：
Deng Shiming
中科院分区：
文献类型：
--
作者：
Shen Chao;Lei Zhuoyu;Lv Guoquan;Ni Long;Deng Shiming
废水热回收对节能环保具有重要意义。然而，所有类型的废水都含有悬浮污染物。这导致换热器表面结垢，导致换热效率低，堵塞换热器。因此，污水源热泵（WWSHP）的使用受到很大限制。为了避免污水热交换器（WWHEX）上的污垢，使其获得更好的性能，提出了一种新型污水热泵系统。本文介绍了新型水源热泵系统的详细结构和运行性能的实验性能评价。这种新型污水源热泵系统的核心是一个废水塔，在这个塔中，循环空气通过水的蒸发从废水中提取热量，而废水中的污染物将被保留。建立了新型水源热泵的实验装置，并组织了5个实验案例。在前四种情况下，实验研究了关键系统运行参数的变化对新型水源热泵系统运行性能的影响。在第五个案例中，实验测试了在预设的45°C热水温度下，从29°C的废浴水中回收热量时，实验装置的整体运行性能。污水塔内主要的换热过程是水蒸发潜热，占总换热量的72.1%。案例1-4的结果表明，随着废水温度的升高，潜热交换所占的百分比也增加。然而，污水流量和循环空气流量的增加对潜热交换占废水塔总传热的百分比影响不大。带污水塔的新型污水热泵系统在污水温度为8℃时运行良好，其scopunit为2.97，热水acopsys2.0。将污水流量从1.29 m3/h提高到1.77 m3/h，可使污水塔的换热率提高4.4%，使copsys2.5 %。另一方面，案例5的实验结果表明，在废水温度为29℃，热水预设温度为45℃时，平均ecopunit为4.99，平均ecopsys3.43，均高于常规污水热泵。
Heat recovery from wastewater is of considerable significance to energy conservation and environmental protection. However, all types of wastewater contain suspended foulant. This leads to fouling on heat exchanger surfaces, resulting in low heat transfer efficiency and blocking heat exchanger. Therefore, the use of wastewater source heat pump (WWSHP) is considerably restricted. In order to avoid the fouling on wastewater heat exchanger (WWHEX) to achieve a better performance, a novel WWSHP system was proposed. The detailed structure and experimental performance evaluation of the operating performances of the novel WWSHP system are described in this paper. The core of this novel WWSHP system was a wastewater tower where circulating air extracted heat from wastewater through the evaporation of water, while the foulant in wastewater would stay. An experimental set-up for the novel WWSHP was established and five experimental cases were organized. In the first four cases, the effects of the variations in key system operating parameters on the operating performances of the novel WWSHP system were experimentally examined. In the fifth case, the overall operating performances of the experimental setup when recovering heat from waste bath water at 29 °C at a preset hot water temperature of 45 °C were experimentally examined. Within the wastewater tower, the main heat transfer process was via latent heat through the evaporation of water, accounting for 72.1% of the total heat transfer exchange. The results of cases 1–4 suggested that with an increase in wastewater temperature, the percentage share of latent heat exchange was also increased. However, the increases in both wastewater flowrate and circulating air flowrate had little effect on the percentage of latent heat exchange in the total heat transfer of the wastewater tower. The novel WWSHP system with the wastewater tower worked well at wastewater temperature of 8 °C, with itsCOPunitof 2.97 and aCOPsysof 2.0 for water heating. Increasing wastewater flowrate from 1.29 m3/h to 1.77 m3/h could help improve the heat transfer rate of the wastewater tower by 4.4% and theCOPsysby 2.5%, respectively. On the other hand, the experimental results for case 5 suggested that at wastewater temperature of 29 °C and a preset hot water temperature of 45 °C, the averageCOPunitwas 4.99 and the averageCOPsyswas 3.43, both being higher than those of conventional WWSHPs.
登录
查看更多内容
DOI：
10.1016/j.pscr.2014.08.007
发表时间：
2014-06
期刊：
Pacific Science Review
影响因子：
--
作者：
L. Alekseiko;V. Slesarenko;A. Yudakov
通讯作者：
L. Alekseiko;V. Slesarenko;A. Yudakov
影响因子：
6.4
作者：
Bin Hu;Hua Liu;Ruzhu Wang;L. Hongbo;Zhiping Zhang;W. Sheng
通讯作者：
Bin Hu;Hua Liu;Ruzhu Wang;L. Hongbo;Zhiping Zhang;W. Sheng
影响因子：
11.2
作者：
Jiankai Dong;Zhuo Zhang;Yang Yao;Yiqiang Jiang;B. Lei
通讯作者：
Jiankai Dong;Zhuo Zhang;Yang Yao;Yiqiang Jiang;B. Lei
影响因子：
1.7
作者：
Shen Chao;J. Yiqiang;Yao Yang;D. Shiming;Wang Xinlei
通讯作者：
Shen Chao;J. Yiqiang;Yao Yang;D. Shiming;Wang Xinlei
影响因子：
6.4
作者：
Z. Gu;J. Qiu;Yun Li;Guoguang Cai
通讯作者：
Z. Gu;J. Qiu;Yun Li;Guoguang Cai