Heat-power decoupling and energy saving of the CHP unit with heat pump based waste heat recovery system

Wang, Haichao; Hua, Pengmin; Wu, Xiaozhou; Zhang, Ruoyu; Granlund, Katja; Li, Ji; Zhu, Ying‐Jie; Lahdelma, Risto; Teppo, Esa; Li, Yu

doi:10.1016/j.energy.2022.123846

Cited by 45 publications

(2 citation statements)

References 29 publications

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“…(1) High efficiency and energy savings: compared with traditional absorption heat pumps, the absorption-compression heat pump has a higher energy efficiency ratio, making significant savings in energy consumption and improving energy efficiency [18]. (2) Recycling waste heat: the absorption-compression heat pump uses waste heat to drive the absorption cycle to recover and utilize the waste heat generated in industrial processes, reducing energy waste [19]. (3) Wide application range: absorption-compression heat pumps can work in a wide range of pressure and temperature HVACs, heating, cooling, and other fields, and have a wide range of application prospects [20].…”

Section: Summary and Prospectsmentioning

confidence: 99%

Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution

Sun

Liu

et al. 2023

Energies

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A large amount of the waste heat generated during industrial production is not used, which leads to a low energy utilization rate. The recovery of industrial waste heat using heat pumps has the advantages of low energy consumption, high efficiency, safety, and environmental protection. Industrial waste heat has a wide temperature distribution range. Traditional absorption and compression heat pumps can only work in a narrow temperature range due to the thermodynamic cycle, the thermal properties of the working medium, the temperature and pressure resistance of the compressor, and other factors; they cannot simultaneously meet the requirements of a “high heating temperature” and “wide temperature-range heat transfer”. To solve the above problems, this paper proposes a high-temperature heat pump unit based on a coupled cycle of absorption and compression, which can recover low-temperature steam and 50 °C waste heat and produce hot water at 110–130 °C. EES software is used for the mathematical modeling and simulation analysis of the heat pump unit. The results show that, when the driving steam temperature is 140 °C and the waste heat temperature is 50 °C, the heating temperature can reach 110~130 °C and the COP of the system can reach 4.22. Increasing the waste heat outlet temperature and the condensation temperature of the absorption cycle strengthens the COP of the coupled cycle; meanwhile, increasing the evaporation temperature and heating temperature of the absorption cycle reduces the COP of the coupled cycle. The results of this study significantly broaden the operating temperature range and heating temperature of electric heat pumps; our findings therefore have essential research significance for improving energy efficiency in industrial fields.

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Section: Summary and Prospectsmentioning

confidence: 99%

Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution

Sun

Liu

et al. 2023

Energies

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“…In addition, Skordoulias et al [26] proposed combining the medium-scale power to hydrogen system and the cogeneration system and analyzed the system performance according to its technical feasibility and economic indicators. Wang et al [27] proposed a novel cogeneration system by adopting a waste heat recovery system via heat pumps and investigated its heat-power decoupling performance and energy-saving potentials.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Short and Long-Term Energy Performance and Decarbonization Potentials between Cogeneration and GSHP Systems under MARKAL Scenarios

et al. 2023

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In response to the call for global carbon peaking and neutrality, this study mainly focuses on the comparison of energy-related carbon emissions and the performance of two promising heating, ventilation, and air-conditioning technologies (a ground source heat pump (GSHP) and cogeneration systems) over both short (2021–2030) and long (2031–2050) periods, considering the UK decarbonization plans. The simulation model of the building with the GSHP system is validated by the actual building heating energy data in 2020 and 2021, with yearly deviations of only 0.4–0.5%. The results show that the cogeneration system performed better than the GSHP system in a scenario when there was no electricity decarbonization plan in the future. However, under all of the MARKet ALlocation (MARKAL) scenarios, the GSHP system performed much better than the cogeneration system in terms of carbon reduction in both periods, which can achieve 47.8–84.4% and maximum 97.5% carbon emission savings in short and long-term periods, respectively, compared with the cogeneration system. Due to the truth that electricity decarbonization plans will be optimized and executed in the future, the GSHP system is more promising and recommended compared with cogeneration system in both short- and long-term periods in terms of only decarbonization potentials (e.g., reducing carbon emission and achieving carbon-related environmental protection).

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Research on Operation Flexibility of Biomass Power Plants with Waste Heat Recovery System

Zhang¹,

Zhu²,

Qi³

et al. 2023

Lecture Notes in Electrical Engineering

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Heat-power decoupling and energy saving of the CHP unit with heat pump based waste heat recovery system

Cited by 45 publications

References 29 publications

Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution

Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution

Comparison of Short and Long-Term Energy Performance and Decarbonization Potentials between Cogeneration and GSHP Systems under MARKAL Scenarios

Research on Operation Flexibility of Biomass Power Plants with Waste Heat Recovery System

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