Introducing a Calculator for the Environmental and Financial Potential of Drain Water Heat Recovery in Commercial Kitchens

Schestak, Isabel; Spriet, Jan; Styles, David; Williams, A. Prysor

doi:10.3390/w13243486

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…Buildings mainly use heat exchangers mounted on the outlet of warm drain water [9]. This solution can be used in both residential and industrial facilities [10]. For larger amounts of wastewater, a heat pump application is necessary [11].…”

Section: Introductionmentioning

confidence: 99%

Horizontal Shower Heat Exchanger as an Effective Domestic Hot Water Heating Alternative

Kordana-Obuch

Starzec

2022

Energies

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Wastewater has significant potential as a source of clean energy. This energy can be used both within external sewer networks and on the scale of individual residential buildings, and the use of shower heat exchangers appears to be the most reasonable solution. However, in the case of Poland, the problem is still the unwillingness of society to use this type of solution, caused mainly by the lack of space for the installation of vertical drain water heat recovery (DWHR) units and the low efficiency of horizontal units. In response to this issue, the efficiency of a new compact shower heat exchanger designed to be mounted below the shower tray, as well as its linear counterpart, was investigated under various operating conditions. In addition, the financial efficiency of using the compact DWHR unit with average water consumption for showering was evaluated. For this purpose, discount methods were used to estimate the financial efficiency of investments. The study showed that the compact shower heat exchanger has higher efficiency than its linear counterpart. Depending on the temperature of cold water and the flow rate of both media through the heat exchanger, it achieves efficiencies ranging from 22.43% to 31.82%, while the efficiency of the linear DWHR unit did not exceed 23.03% in the study. The financial analysis showed that its use is particularly beneficial when the building uses an electric hot water heater. The investment’s sensitivity to changes in the independent variables is small in this case, even with low water consumption per shower. The only exceptions are investment outlays. Therefore, the compact DWHR unit is a clean energy device, which in many cases is financially viable.

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Section: Introductionmentioning

confidence: 99%

Horizontal Shower Heat Exchanger as an Effective Domestic Hot Water Heating Alternative

Kordana-Obuch

Starzec

2022

Energies

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“…This example illustrates in-depth discipline research and transdisciplinary integration of engineering and environmental science in collaboration with kitchen operators. The research study has demonstrated the potential for DWHR in the hospitality sector, combining the design, development and installation of the DWHR demo site with the environmental science leading to the design and development of the Heat Recovery Toolkit for commercial kitchens (Schestak et al, 2021).…”

Section: Researching Green Process Innovationmentioning

confidence: 99%

Researching Green Process Innovation Across Borders and Boundaries Through Collaborative Inquiry

Coughlan,

Bellini,

Bello-Dambatta

et al. 2023

The Journal of Applied Behavioral Science

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Research involving multistakeholder collaborative partnerships is growing, as both academia and funding agencies align their objectives with societal challenges and undertake research in the context of application. In particular, the UN sustainable development goals mandate green process innovation research that transcends disciplinary boundaries. Responding to this opportunity, this article explores the question: how can researchers, as societal stakeholders, collaborate in the design and implementation of a green process innovation research initiative and produce actionable research-based contributions to knowledge? Drawing upon our shared experience of realizing green process innovation, we describe and conceptualize the collaborative inquiry process, reflecting on the interplay of modes of knowledge production and the complementarity of researchers’ roles. We conclude by noting how researchers collaborating in a green process innovation initiative can shape the environment in which Transdisciplinary research (TDR) develops and play different roles enabling breadth and diversity of interaction, depth of disciplinary integration, and production of different types of knowledge.

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“…This technology has significant potential to reduce energy consumption for domestic hot water (DHW) preparation [19], but is often met with reluctance by potential users [20]. It can find application in both residential [21] and commercial buildings [22]. Less conventional solutions are also increasingly being considered.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Suitability of Using Artificial Neural Networks in Assessing the Effectiveness of Greywater Heat Exchangers

Starzec,

Kordana-Obuch,

Piotrowska

2024

Sustainability

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The use of greywater heat exchangers (GHEs) is an effective way to reduce energy consumption for heating domestic water. However, the available characteristics of this type of device are often insufficient and consider only a few selected parameters of water and greywater, which results in the need to look for tools enabling the determination of the effectiveness of GHEs in various operating conditions with incomplete input data. The aim of this paper was to determine the usefulness of artificial neural networks (ANNs). For this purpose, comprehensive experimental tests were carried out on the effectiveness of the horizontal heat exchanger, taking into account a wide range of water and greywater flow rates and temperatures of these media, as well as the linear bottom slope of the unit, which allowed for the creation of a database of 32,175 results. Then, the feasibility of implementing the full research plan was assessed using ANNs. The analysis showed that the impact of the media temperatures on the heat exchanger effectiveness values obtained using ANNs is limited, which makes it possible to significantly reduce the number of necessary experiments. Adopting only three temperature values of at least one medium allowed the generation of ANN models with coefficient values R2 = 0.748–0.999 and RMSE = 0.077–1.872. In the case of the tested GHE, the slope and the flow rate of the mixed water are of key importance. However, even in the case of parameters of significant importance, it is possible to reduce the research plan without compromising the final results. Assuming five different values for each of the four input parameters (a total of 625 combinations) made it possible to generate an ANN model (R2 = 0.993 and RMSE = 0.311) with high generalization ability on the full research plan covering 32,175 cases. Therefore, the conducted analysis confirmed the usefulness of ANNs in assessing the effectiveness of GHEs in various operating conditions. The approach described in this paper is important for both environmental and economic reasons, as it allows for reducing the consumption of water and energy, which are necessary to carry out such scientific research.

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Introducing a Calculator for the Environmental and Financial Potential of Drain Water Heat Recovery in Commercial Kitchens

Cited by 6 publications

References 17 publications

Horizontal Shower Heat Exchanger as an Effective Domestic Hot Water Heating Alternative

Horizontal Shower Heat Exchanger as an Effective Domestic Hot Water Heating Alternative

Researching Green Process Innovation Across Borders and Boundaries Through Collaborative Inquiry

Evaluation of the Suitability of Using Artificial Neural Networks in Assessing the Effectiveness of Greywater Heat Exchangers

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