Product develoment for anti-fouling test bed for grey water heatexchanger

Important results from the project

Rapid cooling of greywater from showers and industrial processes creates fouling layers of chemicals and organic particles. Over time (length unknown), these particles obstruct the flow of greywater and cause significantly reduced heat exchanger efficiency for the installed systems. Treatment of the heat exchanger surfaces shall overcome this challenge. For successful testbed operation in such enviromnet, pre-study has shown that modifications are necessary to obtain better controll of both primary and secondary flows and be adapted for up to 150 liters/minute. 0 / 500 tecken

Expected long term effects

The outcome of the pre-study shows that named modifications will allow the systems to be installed in three different types of showering systems as well as in one industrial application to be used as testbeds, thus allowing fouling studies of heat exchanging of greywater with significant contents of waste energy and how surface treatment can be used to minimize fouling on critical surfaces

Approach and implementation

The aim with this pre-study has been to identify the sites that will be used for installation of the e2r system and the collection of critical operation data. Defined criteria is that the showers must be used frequently (min 15 operations/day), e.g. at schools and training facilities and have different cases of operations such as situations with up to four showerheads running at the same time. This method is of great importance for testing the fouling at different greywater flows and being able to decide on different surface treatments for the different cases.