Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2

Xiao, Xuefeng; Liu, Chao; Xiang, Fu; Hong, Guang; Li, You–Rong

doi:10.1016/j.energy.2015.04.043

Cited by 87 publications

(14 citation statements)

References 20 publications

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“…The parameters of HRGSs changes since part of high-pressure steam flow into SK,h ST ,h HR,in ,h HR,HW ,h EFL are 0.7118,0.1361,0.08452 and 0.06758, respectively. The operation parameters of SC and SK are in literature [10,18]. RE is taken as another heat resource generating thermal energy by wind energy when the heating from CCHP subsystem and auxiliary heating subsystem is not sufficient.…”

Section: Basic Datamentioning

confidence: 99%

“…In the FTL mode, the prime mover is loaded according to the thermal demand and the cooling demand so that the recovered waste heat is enough. But the electricity may be insufficient for the electricity demand [18]. To optimize the operation strategy of CCHP system, Mago et al [19] evaluates the CCHP system operating under FEL and FTL strategies based on energy, cost, and emissions, which found CCHP system should be operated following the electric load for some months and following the thermal load for others to obtain the maximum PEC reduction.…”

Section: Introductionmentioning

confidence: 99%

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Multi-objective operation optimization and evaluation model for CCHP and renewable energy based hybrid energy system driven by distributed energy resources in China

Tan

et al. 2016

Energy

141

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a b s t r a c tThis paper construct a CCHP and renewable energy based hybrid energy system driven by distributed energy resources (DERs CCHP). Then, the paper constructs performance indexes from energy, economic and environment. Thirdly, the paper proposes a multi-objective optimization model for DERs CCHP system under four optimization of energy rate (ER), total operation cost (TOC), carbon dioxide emission reductions (CER) and joint optimization. Finally, Guangzhou Higher Education Mega Center (GHEMC) in China is taken as the object for comparatively analyzing the operation performance of DERs CCHP system and CCHP system driven by natural gas (NG CCHP system). Results show: Joint optimization mode could balance the results of different optimization modes. DERs CCHP system shows better operation performance. ER of ER optimization, CER optimization and joint optimization are higher than that of NG CCHP system. NPV of all optimization modes is positive, IRR are bigger than the expected yield rate. DERs CCHP system could reduce CO 2 emission by utilizing wind energy and solar energy to replace NG. The sensitivity analysis indicates the performance of the DERs CCHP system will become better with the increase of chiller COP, decrease of NG price and wind-photovoltaic equipment cost.

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Section: Basic Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-objective operation optimization and evaluation model for CCHP and renewable energy based hybrid energy system driven by distributed energy resources in China

Tan

et al. 2016

Energy

141

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“…This definition is the same as that in literatures [8? ]. However, Yu et al [14] and Xu et al [15] present another definition of mixing efficiencies, it is…”

Section: Ejector Component Efficienciesmentioning

confidence: 99%

Sparsity-enhanced optimization for ejector performance prediction

Wang

et al. 2016

Energy

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Within a model of the ejector performance prediction, the influence of ejector component efficiencies is critical in the prediction accuracy of the model. In this paper, a unified method is developed based on sparsity-enhanced optimization to determine correlation equations of ejector component efficiencies in order to improve the prediction accuracy of the ejector performance. An ensemble algorithm that combines simulated annealing and gradient descent algorithm is proposed to obtain its global solution for the proposed optimization problem. The ejector performance prediction of a 1-D model in the literature is used as an example to illustrate and validate the proposed method. Tests results reveal that the maximum and average absolute errors for the ejector performance prediction are reduced much more when compared with existing results under the same experimental condition. Furthermore, the results indicate that the ratio of geometric parameters to operating parameters is a key factor affecting the ejector performance.

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“…Using lowgrade heat sources to further raise the heat temperature of the compressor outlet is an attractive alternative solution, and the heat grade is enhanced for producing heating output, cooling output and power output simultaneously. Xu et al [7] proposed two improved CCHP systems by adding a gas heater and an extraction turbine. The extraction turbine is to extract a high pressure stream as a primary fluid of ejector which is benefit to obtain large refrigeration output, and continues to expand the remaining fluid of the extraction turbine to a lower pressure for more power output.…”

Section: Introductionmentioning

confidence: 99%

“…Our improved CCHP systems using supercritical CO 2 have owned the authorized patent [8]. Based the previous study on parametric analysis and exergy analysis for one of the improved CCHP systems [7], this paper attempts to compare the two improved CCHP using supercritical CO 2 to investigate the influence of the thermodynamic parameters on the performance and exergy destruction of the CCHP systems .…”

Section: Introductionmentioning

confidence: 99%

Comparative analyses of two improved CO2 combinated cooling, heating, and power systems driven by solar energy

Bai¹,

2018

THERM SCI

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To make use of solar energy fully and efficiently, the two improved combined cooling, heating, and power systems (CCHP) are proposed by adding a gas heater and an extraction turbine, based on the transcritical CO 2 ejector refrigeration system. A relatively high pressure fluid is extracted by the extraction turbine as a primary stream of ejector to improve the ejector performance. In the meantime, the gas heater absorbs low temperature exhaust heat to increase the extraction turbine's output work. Comparative studies on the thermal efficiency and exergy efficiency of the two improved systems show they are more efficient alternatives for the transcritical CO 2 ejector refrigeration system. The CCHP-B system has relatively broad working condition, higher thermal efficiency and exergy efficiency than that of CCHP-A system.

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Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2

Cited by 87 publications

References 20 publications

Multi-objective operation optimization and evaluation model for CCHP and renewable energy based hybrid energy system driven by distributed energy resources in China

Multi-objective operation optimization and evaluation model for CCHP and renewable energy based hybrid energy system driven by distributed energy resources in China

Sparsity-enhanced optimization for ejector performance prediction

Comparative analyses of two improved CO2 combinated cooling, heating, and power systems driven by solar energy

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