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

Haichao Wang; Pengmin Hua; Xiaozhou Wu; Ruoyu Zhang; Katja Granlund; Ji Li; Yingjie Zhu; Risto Lahdelma; Esa Teppo; Li Yu

doi:10.1016/j.energy.2022.123846

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

Haichao Wang^*, Pengmin Hua, Xiaozhou Wu, Ruoyu Zhang, Katja Granlund, Ji Li, Yingjie Zhu, Risto Lahdelma, Esa Teppo, Li Yu

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

Combined heat and power (CHP) plants are operating under more fluctuating working conditions due to the increasingly inconsistent demands for heat and power and integration of renewable energy. This paper proposes to use an electric heat pump (EHP) to decouple heat and power and save energy by recovering waste heat from the cooling water. The thermodynamic model of the CHP unit under dynamic working conditions is established, and the dynamic EHP model based on an efficiency factor is proposed. The heat-power decoupling and energy-saving potential with different heat and power outputs and the heat pump DH ratio (χ_HP) are analyzed for a CHP unit as a case study. Absorption heat pump (AHP) and EHP-based waste heat recovery systems are also compared. The results indicate that the heat-power decoupling potential is bigger when χ_HP and the heat demand are increasing. The energy-saving effect is clearer by increasing the coefficient of performance (COP), χ_HP, or both. AHP and EHP can help the system obtain a certain level of heat-power decoupling and energy-saving effects, but these effects of the AHP-based system are smaller than that of EHP, especially under the working conditions of high heat demand and low power demand.

Original language	English
Article number	123846
Pages (from-to)	1-16
Number of pages	16
Journal	Energy
Volume	250
DOIs	https://doi.org/10.1016/j.energy.2022.123846
Publication status	Published - 1 Jul 2022
MoE publication type	A1 Journal article-refereed

Keywords

Absorption heat pump (AHP)
Combined heat and power (CHP)
Electric heat pump (EHP)
Energy saving
Heat-power decoupling
Waste heat recovery

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.energy.2022.123846

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

abstract = "Combined heat and power (CHP) plants are operating under more fluctuating working conditions due to the increasingly inconsistent demands for heat and power and integration of renewable energy. This paper proposes to use an electric heat pump (EHP) to decouple heat and power and save energy by recovering waste heat from the cooling water. The thermodynamic model of the CHP unit under dynamic working conditions is established, and the dynamic EHP model based on an efficiency factor is proposed. The heat-power decoupling and energy-saving potential with different heat and power outputs and the heat pump DH ratio (χHP) are analyzed for a CHP unit as a case study. Absorption heat pump (AHP) and EHP-based waste heat recovery systems are also compared. The results indicate that the heat-power decoupling potential is bigger when χHP and the heat demand are increasing. The energy-saving effect is clearer by increasing the coefficient of performance (COP), χHP, or both. AHP and EHP can help the system obtain a certain level of heat-power decoupling and energy-saving effects, but these effects of the AHP-based system are smaller than that of EHP, especially under the working conditions of high heat demand and low power demand.",

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author = "Haichao Wang and Pengmin Hua and Xiaozhou Wu and Ruoyu Zhang and Katja Granlund and Ji Li and Yingjie Zhu and Risto Lahdelma and Esa Teppo and Li Yu",

note = "Funding Information: This work was supported by the China national key research and development program ? China-Finland intergovernmental cooperation in science and technology innovation (Funding No. 2021YFE0116200) and academy research fellow funding from Academy of Finland (Funding No. 336268 and 334205). Funding Information: This work was supported by the China national key research and development program – China -Finland intergovernmental cooperation in science and technology innovation (Funding No. 2021YFE0116200 ) and academy research fellow funding from Academy of Finland (Funding No. 336268 and 334205 ). Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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AU - Hua, Pengmin

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AU - Granlund, Katja

AU - Li, Ji

AU - Zhu, Yingjie

AU - Lahdelma, Risto

AU - Teppo, Esa

AU - Yu, Li

N1 - Funding Information: This work was supported by the China national key research and development program ? China-Finland intergovernmental cooperation in science and technology innovation (Funding No. 2021YFE0116200) and academy research fellow funding from Academy of Finland (Funding No. 336268 and 334205). Funding Information: This work was supported by the China national key research and development program – China -Finland intergovernmental cooperation in science and technology innovation (Funding No. 2021YFE0116200 ) and academy research fellow funding from Academy of Finland (Funding No. 336268 and 334205 ). Publisher Copyright: © 2022 Elsevier Ltd

PY - 2022/7/1

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N2 - Combined heat and power (CHP) plants are operating under more fluctuating working conditions due to the increasingly inconsistent demands for heat and power and integration of renewable energy. This paper proposes to use an electric heat pump (EHP) to decouple heat and power and save energy by recovering waste heat from the cooling water. The thermodynamic model of the CHP unit under dynamic working conditions is established, and the dynamic EHP model based on an efficiency factor is proposed. The heat-power decoupling and energy-saving potential with different heat and power outputs and the heat pump DH ratio (χHP) are analyzed for a CHP unit as a case study. Absorption heat pump (AHP) and EHP-based waste heat recovery systems are also compared. The results indicate that the heat-power decoupling potential is bigger when χHP and the heat demand are increasing. The energy-saving effect is clearer by increasing the coefficient of performance (COP), χHP, or both. AHP and EHP can help the system obtain a certain level of heat-power decoupling and energy-saving effects, but these effects of the AHP-based system are smaller than that of EHP, especially under the working conditions of high heat demand and low power demand.

AB - Combined heat and power (CHP) plants are operating under more fluctuating working conditions due to the increasingly inconsistent demands for heat and power and integration of renewable energy. This paper proposes to use an electric heat pump (EHP) to decouple heat and power and save energy by recovering waste heat from the cooling water. The thermodynamic model of the CHP unit under dynamic working conditions is established, and the dynamic EHP model based on an efficiency factor is proposed. The heat-power decoupling and energy-saving potential with different heat and power outputs and the heat pump DH ratio (χHP) are analyzed for a CHP unit as a case study. Absorption heat pump (AHP) and EHP-based waste heat recovery systems are also compared. The results indicate that the heat-power decoupling potential is bigger when χHP and the heat demand are increasing. The energy-saving effect is clearer by increasing the coefficient of performance (COP), χHP, or both. AHP and EHP can help the system obtain a certain level of heat-power decoupling and energy-saving effects, but these effects of the AHP-based system are smaller than that of EHP, especially under the working conditions of high heat demand and low power demand.

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JF - Energy (the International Journal)

SN - 0360-5442

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ER -

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

Abstract

Keywords

UN SDGs

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TES: Spatiotemporal dynamic simulation of the thermal energy storage assisted heating network and optimization for indoor temperature control

TES: Spatiotemporal dynamic simulation of the thermal energy storage (TES) assisted heating network and optimization for indoor temperature control

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

Abstract

Keywords

UN SDGs

Access to Document

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Other files and links

Embargoed Document

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TES: Spatiotemporal dynamic simulation of the thermal energy storage assisted heating network and optimization for indoor temperature control

TES: Spatiotemporal dynamic simulation of the thermal energy storage (TES) assisted heating network and optimization for indoor temperature control

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