Comparison of two-prototype near-horizontal Drain Water Heat Recovery units on the basis of effectiveness

Kamil Pochwat, Sabina Kordana, Mariusz Starzec and Daniel Słyś

Energy, 2019, vol. 173, issue C, 1196-1207

Abstract: Recovery of energy carried by greywater is possible, for instance, through application of Drain Water Heat Recovery (DWHR) units at the drain water outlet from a shower unit. This paper reports results of a study concerning assessment of rationale behind the use of two different horizontal DWHR units. The analysis, carried out in laboratory conditions proved that equipping of the unit with properly shaped baffles can significantly increase its effectiveness. The effect was observed for all flow rates and device body bottom slopes adopted for the analysis. The paper points out the effect of difference of temperatures between the preheated water and the greywater giving up the heat. The effect turned out to be small in case of the compared devices. Results presented in the paper are of a practical value and can be used as guidelines for designers and potential investors.

Keywords: Design of experiment (DOE); Drain water; Drain water heat recovery (DWHR) unit; Waste heat recovery (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:173:y:2019:i:c:p:1196-1207

DOI: 10.1016/j.energy.2019.02.113

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