Utilization of drainage water heat in flooded urban areas

Kovalenko, Yurii; Katkov, M. V.; Ponomarenko, Ievgenii; Malovanyy, Myroslav; Tymchuk, Ivan

doi:10.12775/eq.2022.011

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…However, risk accompanies each investment and only a few of them contribute to environmental protection. The application of drain water heat exchangers, unlike other ways of using waste heat (e.g., by means of heat pumps [30,31]), leads to a reduction in fossil fuel consumption without the need for external energy. This is important, as the share of water heating in total energy consumption in buildings has increased significantly in recent years [32].…”

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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“…In many cases, this has been followed by a change in consumption patterns, manifested, among other things, in a significant increase in energy demand [1,2]. Given the finite nature of fossil fuel resources and increasing production costs [3,4], as well as the adverse environmental impact of the mining sector [5], energy transformation appears to be an inevitable process. Igli ński et al [6] pointed out that, in the case of the European Union, this transformation is to be based mainly on the diversification of energy sources used, with a predominance of renewable sources.…”

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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Utilization of drainage water heat in flooded urban areas

Cited by 2 publications

References 11 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

Experimental Development of the Horizontal Drain Water Heat Recovery Unit

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