A mathematical model to predict the effect of heat recovery on the wastewater temperature in sewers

Dürrenmatt, David J.; Wanner, Oskar

doi:10.1016/j.watres.2013.10.017

Cited by 67 publications

(56 citation statements)

References 6 publications

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“…Whether it is the collection of GW data [10][11][12][13][14] or technologies to capture this waste heat [15][16][17][18], the possibilities researched upon have been very limited and lack a holistic picture. This is primarily due to the fact, that very low energies are involved in a harnessing technology, of a single unit, making it economical unviable.…”

Section: Objectivesmentioning

confidence: 99%

“…In terms of temperature measuring devices, a non-intrusive and non-invasive instrument is also used, for the same reasons. For sensors clamped on the pipe, it is important that errors due to the ambient temperature do not affect the measurement [12]. For some circumstances, sensors on probes can be used depending on the accuracy required and the access from the piping.…”

Section: Collection Of Production Datamentioning

confidence: 99%

“…At the same time, there are stringent legal requirements both in terms of the minimum allowable temperature after the harnessing and the physical characteristics of the sludge [41]. This is because, it is impossible to treat sewage water below a certain temperature, usually 10 • C [12], as the nitrification process, is severely affected [37]. During the treatment process in the WWTP, the effluent also loses a further 5 • C [40].…”

Section: Levels Of Heat Harnessingmentioning

confidence: 99%

“…Based on past experiences, it is more economical to use a co-generation facility for both heating and cooling [12].…”

mentioning

confidence: 99%

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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: Objectivesmentioning

confidence: 99%

Section: Collection Of Production Datamentioning

confidence: 99%

Section: Levels Of Heat Harnessingmentioning

confidence: 99%

“…Based on past experiences, it is more economical to use a co-generation facility for both heating and cooling [12].…”

mentioning

confidence: 99%

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A Key Review of Non-Industrial Greywater Heat Harnessing

2018

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“…This article focuses on energy provision options related to thermal energy recovery from WWTPs which is reasoned as follows: One major restriction of heat recovery in buildings and sewers concerns the reduction of wastewater temperature. Especially in cold winter days, the reduction might harm the wastewater treatment process and reduce the performance of the WWTP [11][12][13]. At WWTPs wastewater heat recovery can be placed after the treatment process [10], so that the temperature reduction of the cleaned wastewater might even lead to positive environmental effects concerning the receiving water courses [14].…”

Section: Introductionmentioning

confidence: 99%

Mapping Thermal Energy Resource Potentials from Wastewater Treatment Plants

et al. 2015

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Wastewater heat recovery via heat exchangers and heat pumps constitutes an environmentally friendly, approved and economically competitive, but often underestimated technology. By introducing the spatial dimension in feasibility studies, the results of calculations change considerably. This paper presents a methodology to estimate thermal energy resource potentials of wastewater treatment plants taking spatial contexts into account. In close proximity to settlement areas, wastewater energy can ideally be applied for heating in mixed-function areas, which very likely have a continuous heat demand and allow for an increased amount of full-load hours compared to most single-use areas. For the Austrian case, it is demonstrated that the proposed methodology leads to feasible results and that the suggested technology might reduce up to 17% of the Austrian global warming potential of room heating. The method is transferrable to other countries as the input data and calculation formula are made available. A broad application of wastewater energy with regard to spatial structures and spatial development potentials can lead to (1) increasing OPEN ACCESSSustainability 2015, 7 12989 energy efficiency by using a maximum of waste heat and (2) a significant reduction of (fossil) energy consumption which results in a considerable reduction of the global warming potential of the heat supply (GWP) if electricity from renewables is used for the operation of heat pumps.

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Assessment of a Heat Pump-Based Wastewater Heat Recovery System for a Canadian University Campus

Chow

Duquette

2018

Springer Proceedings in Energy

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A mathematical model to predict the effect of heat recovery on the wastewater temperature in sewers

Cited by 67 publications

References 6 publications

A Key Review of Non-Industrial Greywater Heat Harnessing

A Key Review of Non-Industrial Greywater Heat Harnessing

Mapping Thermal Energy Resource Potentials from Wastewater Treatment Plants

Assessment of a Heat Pump-Based Wastewater Heat Recovery System for a Canadian University Campus

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