Energy, environmental and economic assessment of wastewater heat recovery systems in hotel buildings

Zhang, Dongwei; Fang, Chenglei; Gao, Zhao; Wang, Xin; Shen, Chao; Li, Hang

doi:10.1016/j.applthermaleng.2022.119949

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…Considering that the use of wastewater HPs guarantees the recovery of much larger amounts of energy compared to wastewater heat exchangers, their potential for saving fossil fuel resources and reducing greenhouse gas emissions is significantly higher. Zhang et al [33] demonstrated that they can even compete with heat pump systems based on more conventional energy sources, such as geothermal energy or air.…”

Section: Strengths and Weaknessesmentioning

confidence: 99%

“…HPs are also successfully used in hotels. Zhang et al [33] studied the energy, environmental and economic performance of a hotel wastewater heat pump in China, while Todorovic et al [124] analyzed the legitimacy of using a wastewater heat pump to prepare domestic hot water in a hotel in Serbia comparing this solution to a conventional gas boiler. The rooms of the office building in Singen have been heated in winter since 2004 with heat coming from the recovery of wastewater energy, which is received by means of an 80-m heat exchanger placed in the sewer pipe and a heat pump.…”

Section: Heat Recovery In Industrial Facilitiesmentioning

confidence: 99%

“…Although the use of these devices requires the supply of additional drive energy, the range of potential applications of the recovered heat is significantly wider. These may be, for example, central heating and DHW installations in buildings [33,34] or WWTPs facilities [35], as well as industrial installations [36,37]. More and more often, wastewater is also considered as a source of energy in low-temperature district heating networks of the 4th [38] and 5th [39] generation.…”

Section: Introductionmentioning

confidence: 99%

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Opportunities and Challenges for Research on Heat Recovery from Wastewater: Bibliometric and Strategic Analyses

Kordana-Obuch,

Wojtoń,

Starzec

et al. 2023

Energies

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The potential for recovering heat from wastewater exists at various stages, including generation, transport, and treatment. As a result, various technologies for thermal energy recovery from wastewater are now successfully employed in many countries. In order to synthetically present the current state of knowledge on heat recovery from wastewater, a bibliometric analysis of previously published studies indexed in the Web of Science database was performed. The review was further extended with strategic SWOT and SOAR analyses to identify internal and external factors determining the competitive advantage and weaknesses related to the use of wastewater heat exchangers and heat pumps. These analyses indicated the need for further research on the possibilities of heat recovery from wastewater as the use of this technology, both at the building level and on a larger scale, contributes to the implementation of sustainable development goals, especially in terms of improving energy efficiency and reducing CO2 emissions. Particular emphasis should be placed on research into the use of warm wastewater together with other, better known and accepted, renewable energy sources. It is also important to continuously educate the public and promote heat recovery technologies at various levels, as well as to increase the involvement of legislators and other stakeholders.

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Section: Strengths and Weaknessesmentioning

confidence: 99%

Section: Heat Recovery In Industrial Facilitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Opportunities and Challenges for Research on Heat Recovery from Wastewater: Bibliometric and Strategic Analyses

Kordana-Obuch,

Wojtoń,

Starzec

et al. 2023

Energies

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“…However, alternative solutions with greater environmental compatibility are increasingly being sought. For example, Zhang et al [39] dedicated their research to the transcritical CO 2 heat pump. The use of heat pumps is justified when significant amounts of warm wastewater are produced in a building.…”

Section: Introductionmentioning

confidence: 99%

Experimental Development of the Horizontal Drain Water Heat Recovery Unit

Kordana-Obuch

Starzec

2023

Energies

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The increase in energy demand, the scarcity of resources, as well as the adverse environmental impact of burning fossil fuels make it necessary to diversify the energy sources used. This also applies to the residential sector, which accounts for a significant proportion of global energy consumption. Particular attention should be paid to water heating, as the importance of this process in the energy balance of buildings is steadily increasing. One of the methods used to decrease energy consumption for heating water is to recover heat from greywater. However, commercially available horizontal drain water heat recovery (DWHR) units are characterized by low effectiveness, which creates a need for further research to improve it. The aim of the paper was to evaluate the possibility of improving the effectiveness of a circular horizontal DWHR unit through the use of baffles. Six different baffle models for installation in the greywater section of the heat exchanger were analyzed. The tests were conducted under the assumption of the installation of the DWHR unit on the horizontal shower waste pipe. They showed that the effectiveness of the unit equipped with baffles was higher by several to as much as 40% compared to the DWHR unit without baffles. This is tantamount to an increase in annual financial savings resulting from greywater heat recovery, as well as a reduction in CO2 emissions into the atmosphere. However, it was not possible to clearly identify the optimum baffle model. In any case, the selection should consider the hydraulic conditions in the heat exchanger before installing the baffles. The results can provide guidance for companies interested in bringing new equipment and technologies to the market.

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Economic–environmental trade-offs based support policy towards optimal planning of wastewater heat recovery

Zhao,

Xu,

Wang

et al. 2024

Applied Energy

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Energy, environmental and economic assessment of wastewater heat recovery systems in hotel buildings

Cited by 9 publications

References 39 publications

Opportunities and Challenges for Research on Heat Recovery from Wastewater: Bibliometric and Strategic Analyses

Opportunities and Challenges for Research on Heat Recovery from Wastewater: Bibliometric and Strategic Analyses

Experimental Development of the Horizontal Drain Water Heat Recovery Unit

Economic–environmental trade-offs based support policy towards optimal planning of wastewater heat recovery

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