Multi-mode and exergoeconomic analysis of a novel combined cooling, heating, and power system applied in the geothermal field

Wang, Shukun; Liu, Chao; Tang, Junrong; Xiao, Tingyu; Huo, Erguang; Guan, Zhengjun

doi:10.1016/j.enconman.2022.116565

Cited by 26 publications

(2 citation statements)

References 42 publications

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“…To enhance reliability and reduce energy consumption in building air conditioning systems, a combined approach leveraging both artificial and natural sources is imperative to maximize benefits for space cooling and heating. Currently, the integration of artificial cooling and heating sources with natural ventilation [29,30] and solar energy utilization [31,32] has been extensively adopted, yielding significant economic and environmental advantages. While much attention has been given to utilizing deep soil directly for space cooling, the integration of artificial and natural sources remains as the focus of research.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Application Analysis of a Novel Full Fresh Air System Using Only Geothermal Energy for Space Cooling and Dehumidification

Han,

Li,

et al. 2024

Buildings

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To effectively reduce building energy consumption, a novel full fresh air system with a heat source tower (HST) and a borehole heat exchanger (BHE) was proposed for space cooling and dehumidification in this paper. The cooling system only adopts geothermal energy to produce dry and cold fresh air for space cooling and dehumidification through the BHE and HST, which has the advantage of non-condensate water compared to BHE systems integrated with a fan coil or chilled beam. Based on the established mathematical model of the cooling system, this paper analyzed the system characteristics, feasibility, operation strategy, energy performance, and cost-effectiveness of the proposed model in detail. The results show that the mathematical model has less than 10% error in estimating the system performance compared to the practical HST−BHE experimental set up. Under the specific boundary conditions, the cooling and dehumidification capacity of this system increases with the decrease in the air temperature, air moisture content, and inlet water temperature of the HST. The optimal cooling capacity and the system COP can be achieved when the air–water flow ratio is at 4:3. A case study was conducted in a residential building in Shenyang with an area of about 1800 m2. It was found that this system can fully meet the cooling and dehumidification demand in such a residential building. The operation strategy of the cooling system can be optimized by adjusting the air–water flow ratio from 4:3 to 3:2 during the early cooling season (7 June–1 July) and end cooling season (3 August–1 September). As a result, the average COP of the cooling system during the whole cooling season can be improved from 6.1 to 8.7. Compared with the air source heat pump (ASHP) and the ground source heat pump (GSHP) for space cooling, the proposed cooling system can achieve an energy saving rate of 123% and 26%, respectively. Considering that the BHE of the GSHP can be part of the proposed HST−BHE cooling system, the integration of the HST and GHSP for space cooling (and heating) is strongly recommended in actual applications.

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Section: Introductionmentioning

confidence: 99%

Characteristics and Application Analysis of a Novel Full Fresh Air System Using Only Geothermal Energy for Space Cooling and Dehumidification

Han,

Li,

et al. 2024

Buildings

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“…In the realm of research methodologies, when confronted with multiple performance objectives, the optimization of system design inevitably involves methods such as multiobjective optimization and multiobjective decision-making. Wang et al 36 employed multiobjective optimization techniques to optimize the thermodynamic performance and overall cost per unit of product in a CCHP system, resulting in the attainment of comprehensive performance limits. Additionally, in another ORC system, Wang et al 37 utilized multiobjective decision-making approaches to analyze factors including thermodynamics, economics, and the environment.…”

Section: Introductionmentioning

confidence: 99%

“3E” Analysis and Working Fluid Selection for a Cogeneration System for Geothermal Large Temperature Difference Utilization

Yin,

Zhu,

Zhang

et al. 2024

ACS Omega

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Widespread utilization of geothermal energy as a clean energy source can reduce the use of fossil fuels and thereby protect the environment. Previous combined heat and power (CHP) systems using low-temperature geothermal heat as a heat source have limited utilization of geothermal heat. In this study, a cogeneration system based on organic Rankine cycle (ORC) and absorption heat exchanger (AHE) is designed. We analyzed the thermal efficiency, exergy efficiency, and economics of the proposed system utilizing 85 °C lowtemperature geothermal heat, and the optimal operating fluid for this system is discussed. The results show that the optimal working fluid for the proposed system is R245fa. Using R245fa as the working fluid, the proposed system can achieve an exergy efficiency of 61.39%, when the heat source outlet temperature can be as low as 23 °C, while the proposed system can achieve the lowest LCOE of 0.082 ($/kW •h) when using R22 as the working fluid.

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Comparative analysis and optimization of waste-heat recovery systems with large-temperature-gradient heat transfer

Li,

Qian,

Teng

et al. 2023

Applied Thermal Engineering

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Multi-mode and exergoeconomic analysis of a novel combined cooling, heating, and power system applied in the geothermal field

Cited by 26 publications

References 42 publications

Characteristics and Application Analysis of a Novel Full Fresh Air System Using Only Geothermal Energy for Space Cooling and Dehumidification

Characteristics and Application Analysis of a Novel Full Fresh Air System Using Only Geothermal Energy for Space Cooling and Dehumidification

“3E” Analysis and Working Fluid Selection for a Cogeneration System for Geothermal Large Temperature Difference Utilization

Comparative analysis and optimization of waste-heat recovery systems with large-temperature-gradient heat transfer

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