Impact of small tilt angles on the performance of falling film drain water heat recovery systems

Manouchehri, Ramin; Banister, Carsen; Collins, Michael R.

doi:10.1016/j.enbuild.2015.05.024

Cited by 21 publications

(9 citation statements)

References 4 publications

(6 reference statements)

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“…Usually made from stainless steel to avoid corrosion and fouling. In footplate-type design, a chamber collected the GW, through which this GW was guided to plate HEs immersed inside [49]. In another design, a shower platform with an integrated lattice type plate exchanger is placed on the slab of a shower unit, recovering 50% of the heat content of the GW [50].…”

Section: Heat Pumpsmentioning

confidence: 99%

A Key Review of Non-Industrial Greywater Heat Harnessing

2018

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Abstract:The ever-growing concerns about making buildings more energy efficient and increasing the share of renewable energy used in them, has led to the development of ultra-low carbon buildings or passive houses. However, a huge potential still exists to lower the hot water energy demand, especially by harnessing heat from waste water exiting these buildings. Reusing this heat makes buildings more energy-efficient and this source is considered as a third-generation renewable energy technology, both factors conforming to energy policies throughout the world. Based on several theoretical and experimental studies, the potential to harness non-industrial waste water is quite high.As an estimate about 3.5 kWh of energy, per person per day could be harnessed and used directly, in many applications. A promising example of such an application, are low temperature fourth generation District Heating grids, with decentralized sources of heat. At the moment, heat exchangers and heat pumps are the only viable options to harness non-industrial waste heat. Both are used at different scales and levels of the waste-water treatment hierarchical pyramid. Apart from several unfavourable characteristics of these technologies, the associated exergetic efficiencies are low, in the range of 20-50%, even when cascaded combinations of both are used. To tackle these shortcomings, several promising trends and technologies are in the pipeline, to scavenge this small-scale source of heat to a large-scale benefit.

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Section: Heat Pumpsmentioning

confidence: 99%

A Key Review of Non-Industrial Greywater Heat Harnessing

2018

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“…The warm wastewater flows through the inner pipe, while the cold incoming water flows in the opposite direction through the outer pipe (counter flow principle, Supplementary Material S2). For a fully functional heat exchanger and maximum heat recovery, the warm drain water has to form a falling film along the wall of the inner pipe (Manouchehri et al, 2015). This is enabled through a vertical installation (Manouchehri et al, 2015).…”

Section: Description Of the System And Inventory 231 Overviewmentioning

confidence: 99%

“…For a fully functional heat exchanger and maximum heat recovery, the warm drain water has to form a falling film along the wall of the inner pipe (Manouchehri et al, 2015). This is enabled through a vertical installation (Manouchehri et al, 2015). The heat exchanger is connected to the existing pipework via plastic fittings (bottom and top connectors) with joint rings, one fitting each end of the pipe (BPD ltd., 2019a).…”

Section: Description Of the System And Inventory 231 Overviewmentioning

confidence: 99%

Emissions down the drain: Balancing life cycle energy and greenhouse gas savings with resource use for heat recovery from kitchen drains

Schestak

Spriet

Styles

et al. 2020

Journal of Environmental Management

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Although the food service sector is a major user of water, the potential for heat recovery from commercial kitchens' drain water remains largely unexplored. For the first time, we compare the life cycle environmental burdens of producing and installing a heat recovery system with the environmental credits arising from energy savings for a restaurant case study, and for the entire UK food service sector. Life Cycle Assessment was applied to determine the impacts of heat recovery systems made from different materials and comprising a heat exchanger in the shape of a concentric double-walled pipe, pipework and fittings. The design option with the smallest environmental footprint combined a heat exchanger made out of polypropylenegraphite (PP-GR) with polyethylene pipework, exhibiting 80-99% less environmental impact compared with components made out of (35% recycled) copper. Contrasting the environmental impacts of two heat recovery set-ups with energy savings shows that a PP-GR based system pays back all seven assessed environmental impacts within two years, while payback times for the copper-based system vary depending on the replaced energy source, and can exceed the 10 year operational lifetime of the system. When looking at typical flowrates in UK food outlets, net environmental savings can be realised across all analysed impact categories above a threshold water consumption of 555 L/day, using current technology. Extrapolation to the UK food service sector indicates annual greenhouse gas emission mitigation potential of about 500 Gg CO2 equivalent.

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“…Furthermore, the importance of solar radiation components on the performance of solar collectors and photovoltaic panels were investigated by predicting the optimum slope angle and the input solar energy in different combinations of the solar components [27]. Bracamonte et al showed effect of the tilt angle (10°, 27° and 45°) on thermal efficiency and stratification of water in glass evacuated tube passive solar water heater [28]. Manouchehri et al presented impact of small tilt angles of 0°, 2°, 5°, 10° and 15° with respect to the vertical on the performance of falling film drain water heat recovery systems [29].…”

Section: Summary Of Criteriamentioning

confidence: 99%