Simulation and analysis of hot water system with comprehensive utilization of solar energy and wastewater heat

Zhang, Dongwei; Gao, Zhao; Fang, Chenglei; Shen, Chao; Li, Hang; Qin, Xiang

doi:10.1016/j.energy.2022.124181

Cited by 8 publications

(7 citation statements)

References 26 publications

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“…Recovery of waste heat from wastewater using heat pumps is an efficient and environmentally friendly solution that can use wastewater from technological processes and those related to human existence as a lower source of energy for heat pumps. Currently, wastewater HPs technologies are used both on a large scale in sewage systems and facilities, such as sewer pipes, wastewater treatment plants, or wastewater pumping station [35,118], as well as on a smaller scale, i.e., in buildings [119,120]. Regardless of the system's scope, the energy recovered from wastewater can be used for domestic hot water preparation, space heating in winter, and cooling in summer.…”

Section: The Latest Research On the Use Of Wastewater Heat Pumpsmentioning

confidence: 99%

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: The Latest Research On the Use Of Wastewater Heat Pumpsmentioning

confidence: 99%

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 effective COP of the system is the ratio of the terminal heat supply to the total system power consumption, calculated using Equation (13).…”

Section: Heat Pump and Water Pumpmentioning

confidence: 99%

“…It was found that the system performance coefficient and the heat pump performance coefficient were strongly related to the flow rate of the pump and the storage capacity of the heat exchanger tank. The azimuth and tilt angle of the solar collector had little effect on the performance coefficient [13]. However, solar-coupled heat pump systems still have problems, such as large footprints, mismatches between the energy-supply system and the energy-using system, and optimization of the configuration of the coupling system.…”

Section: Introductionmentioning

confidence: 99%

Heating Performance and Economic Analysis of Solar-Assisted Cold-Water Phase-Change-Energy Heat Pump System in Series and Parallel Connections

Yang

Zhang

et al. 2023

Energies

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To study the heating performance of a solar-assisted cold-water phase-change-energy heat pump system, its heating performance under series and parallel connections is simulated for a community in Harbin, the influence of ice thickness on the different operation modes is analyzed, and the economy of the system is calculated for series and parallel connections in this paper. The results show that the water supply temperature is higher and more uniform in the parallel operation, and more terminal heat is supplied; the ice thickness has more of an influence on the series connection compared to the parallel connection; and the dynamic payback period is 6.72 years for the series connection and 7.28 years for the parallel connection. This case study can serve as a guide for practical engineering application projects and act as a reference for heating and economic data for the promotion of this heat pump system.

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“…The study analyzed the impact of different system parameters on system performance, and the system coefficient of performance in the winter in different climatic zones reached above 3.5. Zhang et al [17] proposed a heat pump hot water supply system assisted by solar energy and utilizing hotel wastewater as a heat source. The study analyzed the impact of different parameter variations on system performance and determined the optimal system parameters.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Optimization of Solar-Coupled Mine Water-Source Heat Pump Combined Heating and Cooling System

Zhao,

Wang

2024

Sustainability

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To address the energy consumption issue in mining area buildings, this paper proposed a solar-coupled mine water-source heat pump combined heating and cooling (SMWHP-CHC) system, taking the employee dormitory building group of a coal mining enterprise in Tongchuan City, China, as a case study. The system utilizes renewable solar energy and waste heat recovered from mine water as composite heat sources, and utilizes the cold energy in mine water as a cooling source to meet the demands for space heating, space cooling, and annual domestic hot water of the building in a sustainable manner. The simulation model of the system was established by TRNSYS to analyze the system’s annual operational performance. The results indicated that the system exhibited a positive energy efficiency and environmental performance under different operating conditions. The heating coefficients of the performance of the system (COPsys) during the space heating season and transition season were 3.54 and 18.6, and the cooling energy efficiency ratio of the system (EERsys) was 3.79. In addition, aiming to minimize the annual cost of the system, multiple crucial device parameters were synchronously optimized employing the PSO-HJ hybrid optimization algorithm through the GenOpt 2 software. The annual cost of the optimized system was reduced by 8.82%, and the investment cost was significantly reduced, while the performance was also improved. This study can provide theoretical support for the sustainable engineering application of the SMWHP-CHC system in mining area buildings.

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Simulation and analysis of hot water system with comprehensive utilization of solar energy and wastewater heat

Cited by 8 publications

References 26 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

Heating Performance and Economic Analysis of Solar-Assisted Cold-Water Phase-Change-Energy Heat Pump System in Series and Parallel Connections

Performance Analysis and Optimization of Solar-Coupled Mine Water-Source Heat Pump Combined Heating and Cooling System

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