Experimental performance evaluation of a novel dry-expansion evaporator with defouling function in a wastewater source heat pump

Shen Chao, Jiang Yiqiang, Yao Yang and Deng Shiming

Applied Energy, 2012, vol. 95, issue C, 202-209

Abstract: The performance of a novel dry-expansion evaporator developed for a wastewater source heat pump (WWSHP) was experimentally tested and the test results are reported. The evaporator is a retrofitted shell and tube heat exchanger where bio-fouling build-up on tube surface can be easily removed from outside of the heat exchanger. An experimental WWSHP containing the novel evaporator using waste bath water as heat source for water heating was built up. A one-month long test to examine the effect of tube bio-fouling on the operating performance of the WWSHP was conducted. The test data suggested that with the growth of bio-fouling on the evaporator surface during the testing period, the daily averaged refrigerant temperature leaving the expansion valve decreased gradually from 11.4 to 9.4°C; the daily averaged heat exchange capacity of the evaporator dropped from 8.2 to 5.8kW, and the daily averaged COP of the WWSHP decreased gradually from 3.09 to 2.50. However, after performing cleaning at the end of the one-month long testing period, the averaged refrigerant temperature leaving the expansion valve was increased from 9.4 to 11.2°C; the averaged heat exchange capacity was increased from 5.8 to 8.0kW, and the averaged COP was also increased from 2.50 to 3.04. These comparison results demonstrated clearly that the novel evaporator with defouling function was effective in easily removing the bio-fouling build-up at a low cost.

Keywords: Waste heat recovery; Dry-expansion evaporator; Bio-fouling; Defouling; Wastewater source heat pump (WWSHP) (search for similar items in EconPapers)
Date: 2012
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261912001249
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:95:y:2012:i:c:p:202-209

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2012.02.030

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().