Waste Heat Recovery Technologies Revisited with Emphasis on New Solutions, Including Heat Pipes, and Case Studies

Christodoulides, Paul; Agathokleous, Rafaela A.; Aresti, Lazaros; Kalogirou, Soteris A.; Tassou, S.A.; Florides, Georgios A.

doi:10.3390/en15010384

Cited by 28 publications

(28 citation statements)

References 59 publications

(67 reference statements)

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“…The lower source of energy for this device can be greywater [12], raw sewage transported by sewage collectors and flowing through the technological facilities of the sewage treatment plant [13,14], as well as treated sewage flowing towards the receiver [15]. Industrial wastewater can also be used as a heat source [16]. For example, Reiners et al [17] analyzed the efficiency of a heat pump using wastewater from the coal mining industry in ultra-low-temperature district heating systems.…”

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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“…If the economic aspects of the project are further explored, it is hoped that the number of users from the agricultural sector will increase and that a sustainable policy will be developed that does not rely on subsidies. Furthermore, it will be important to continue to look at technological improvements, such as the development of new solutions such as heat pipes [47] and the generation of electricity from low and medium temperature industrial surplus heat [48], as in the case of this inverter. As shown in the example of system-wide evaluation including crop production, distribution, and consumption [49], further studies for the formation of a heat transport network in which agriculture, industry and commerce are linked will be useful for implementation in the future.…”

Section: Consideration Of the Reduction Of Transportation Costs And H...mentioning

confidence: 99%

Proposal of Agro-Industrial Integration Heat Transport System Using High-Performance Medium for the Realization of a Sustainable Society

2022

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The aim of this study is to propose an agro-industrial heat transport system from industrial to agricultural areas for horticultural facilities with high heat demand to fill the problematic gap in the current heat transport system, and to derive by simulation the conditions under which this system can be used economically as well as environmentally. In this study, HASClay was used as a high-performance medium. HASClay has the ability to supply carbon dioxide (CO2) at the same time as heat and dehumidify the inside of the house, so it can be expected to increase the yield in addition to reducing the environmental load by using heat. The simulation results show that the proposed system of supplying heat to a large greenhouse in HASClay in 20-ton containers would have an economic budget similar to that of the previous system, but with an environmental impact of about 80% less tomatoes and 84% less chrysanthemum fuel than the previous system of heating with fuel oil. On the other hand, the analysis showed that the power of the fan could be reduced as an improvement of the heat transport problem using HASClay. As a countermeasure, the use of natural energy and the change of the fan for heat supply from a damper system to an inverter system to control the air volume were considered. For transport to the 10a scale, which has environmental advantages, a system was proposed in which the heat from the HASClay is divided into mini-tanks and transported to stations envisaged in each region, where it is collected by the agricultural producers. In summary, the authors concluded that our proposal for an agro-industrial fusion system based on the transport of heat using HASClay is an effective method for the realization of a sustainable society. The environmental benefits of the project are likely to attract participation from the industrial sphere in order to meet future demands for CO2 reductions.

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“…This can be achieved by energy management and renewable energy [1][2][3][4][5][6]. In particular, heat recovery represents a key aspect in the notable growth of energy management efforts [7][8][9][10][11]. The vast range of applications of heat recovery includes ICEs-internal combustion engines [11], chimneys [12][13][14][15][16], energy recovery from shower water drain [17,18], and HVAC (Heating Ventilating and Air Conditioning) [19,20].…”

Section: Introductionmentioning

confidence: 99%

Heating/Cooling Fresh Air Using Hot/Cold Exhaust Air of Heating, Ventilating, and Air Conditioning Systems

Khaled

Ali²,

Jaber

et al. 2022

Energies

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This paper suggests a heat recovery concept that is based on preheating/precooling the cold/hot fresh outside air by means of the relatively hot/cold exhaust air in winter/summer weather conditions. To investigate the feasibility of such a concept, an experimental setup is established to simulate conditions similar to an All-Air HVAC system. The prototype consists of a 6.7-m3 air-conditioned chamber by means of a split unit of 5.3-kW capacity. The heat recovery module consists of a duct system that is used to reroute the exhaust air from a conditioned chamber to flow through the fin side of a fin-and-tube heat exchanger of crossflow type. At the same time, outside, fresh air is flowing through the tube side of the fin-and-tube heat exchanger. A parametric study is performed to assess the amount of heat that can be recovered by varying the mass flow rates on both the duct and heat exchanger sides. The results show that up to 200 W of power can be saved for an exhaust flow rate of 0.1 kg/s and a fresh, outdoor air flow rate of 0.05 kg/s. Environmentally speaking, this leads to a reduction in production of about 1 tons of CO2 per year when the system operates 24 h/day. From an economic point of view, the system is able to return its price after 1.5 years when it is used 24 h per day during hot days at 196-W thermal recovery, whereas it requires at least 6.3 years when it is used during cold days at a 60-W thermal recovery rate, which, in both cases, represents a duration less than the lifespan of an air conditioner.

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Waste Heat Recovery Technologies Revisited with Emphasis on New Solutions, Including Heat Pipes, and Case Studies

Cited by 28 publications

References 59 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

Proposal of Agro-Industrial Integration Heat Transport System Using High-Performance Medium for the Realization of a Sustainable Society

Heating/Cooling Fresh Air Using Hot/Cold Exhaust Air of Heating, Ventilating, and Air Conditioning Systems

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