Zanášení výměníku tepla z dutých vláken v odpadní vodě

Fouling of Polymeric Hollow Fiber Heat Exchanger by Wastewater

článek ve sborníku ve WoS nebo Scopus

en

Warm wastewater can be used as a source of heat for heat pumps in buildings such as gyms, swimming pools, and laundries. Unfortunately, heat exchangers installed in a sewage channel are negatively affected by fouling because deposits on the heat exchange surface create additional resistance to heat transfer and decrease the efficiency of the system. Heat exchangers consisting of polypropylene hollow fibers were prepared and tested to transfer heat from two types of wastewater: from a shower and from laundry. It was found that these devices have high thermal performance (with an overall heat transfer coefficient of up to 2,020 W/m2 K) while working in clean conditions. Fouling tests showed that fouling strongly depends on the type of wastewater. During the experiment with shower wastewater the observed fouling was low because it was associated with the accumulation of a small amount of solid particles (particulate fouling). No significant decrease of overall heat transfer coefficient was observed during the two-week test in this case. The experiment with laundry wastewater showed that fouling was more extensive because it was associated with both types of fouling: particulate fouling and biofouling. The overall heat transfer coefficient was decreased by two times (from 1747 W/m2 K to 863 W/m2 K) during the 35-day experiment.

Výměníky tepla nainstalované do kanálů odpadních vod jsou negativně ovlivněné zanášením. Výměníky z polypropylenových dutých vláken byly testovány v těchto podmínkách a bylo zjištěno, že tato zařízení mají vysokou tepelnou účinnost (celkový součinitel prostupu tepla až do 2020 W/m2K). Kromě toho testy ukázaly, že znečištění silně závisí na typu odpadních vod.

Warm wastewater can be used as a source of heat for heat pumps in buildings such as gyms, swimming pools, and laundries. Unfortunately, heat exchangers installed in a sewage channel are negatively affected by fouling because deposits on the heat exchange surface create additional resistance to heat transfer and decrease the efficiency of the system. Heat exchangers consisting of polypropylene hollow fibers were prepared and tested to transfer heat from two types of wastewater: from a shower and from laundry. It was found that these devices have high thermal performance (with an overall heat transfer coefficient of up to 2,020 W/m2 K) while working in clean conditions. Fouling tests showed that fouling strongly depends on the type of wastewater. During the experiment with shower wastewater the observed fouling was low because it was associated with the accumulation of a small amount of solid particles (particulate fouling). No significant decrease of overall heat transfer coefficient was observed during the two-week test in this case. The experiment with laundry wastewater showed that fouling was more extensive because it was associated with both types of fouling: particulate fouling and biofouling. The overall heat transfer coefficient was decreased by two times (from 1747 W/m2 K to 863 W/m2 K) during the 35-day experiment.

hollow fibers, heat exchanger, waste water

2015

16.11.2015

Italian Association of Chemical Engineering - AIDIC

Italy

978-88-95608-36-5

1974-9791

Proceedings of the 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2015)

45

949–954

6