Off-design analysis of a CO2 Rankine cycle for the recovery of LNG cold energy with ambient air as heat source

Xia, Wenkai; Huo, Yaowu; Song, Yunfei; Han, Jianming; Dai, Yiping

doi:10.1016/j.enconman.2018.12.098

Cited by 60 publications

(9 citation statements)

References 34 publications

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“…Off-design analysis for the pump is conducted on the basis of performance maps shown in Figure 2, 30 which stem from a multistage centrifugal pump in a real geothermal plant. Off-design analysis for the pump is conducted on the basis of performance maps shown in Figure 2, 30 which stem from a multistage centrifugal pump in a real geothermal plant.…”

Section: Feed Pumpmentioning

confidence: 99%

“…A centrifugal pump is used in the ORC to elevate fluid pressure. Off-design analysis for the pump is conducted on the basis of performance maps shown in Figure 2, 30 which stem from a multistage centrifugal pump in a real geothermal plant. The rated rotational speed of the pump is 1500 rpm.…”

Section: Feed Pumpmentioning

confidence: 99%

“…After which, off-design performance analysis and comparison results are shown in Section (30). Then, mathematic models and performance indices are included in Section 3.…”

Section: Introductionmentioning

confidence: 99%

“…Then, mathematic models and performance indices are included in Section 3. After which, off-design performance analysis and comparison results are shown in Section (30). Finally, the main conclusions are summarized in Section 4.…”

Section: Introductionmentioning

confidence: 99%

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Performance comparison of different combined heat and compressed air energy storage systems integrated with organic Rankine cycle

et al. 2019

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Summary Compressed air energy storage (CAES) is promising to enable large‐scale penetration of renewable energies (REs). However, conventional diabatic CAES (D‐CAES) depends largely on fossil fuels, while adiabatic CAES (A‐CAES) is limited in output power. To conquer these disadvantages, concept of combined heat and CAES (CH‐CAES) is proposed in this paper. The proposed system couples an electric heater with conventional A‐CAES. During charging, electricity storage transforms from pure compression to partly relying on Joule heating. The stored heat in an electric heater will be used to boost turbine inlet temperature during discharging. Consequently, system charge/discharge capacity can be improved without enlarging cavern size, raising cavern pressure, and producing greenhouse gases. This paper discusses three types of CH‐CAES systems with different electric heater installation positions. Off‐design performance analysis for each system is conducted on the basis of turbomachinery (compressors, turbines, and the pump) characteristic maps and heat exchangers off‐design models. Performance comparison is conducted between these three CH‐CAES systems (called Mode II, III, and IV for simplification) and the conventional A‐CAES system (Mode I). Control strategies are also given in this paper. Results show that the EVR (energy generated per unit volume of storage) increases with participation of an electric heater, while the RTE (system roundtrip efficiency) slightly decreases. Mode I has the highest RTE. The largest EVR appears in Mode III where the electrical heater is in series with the intercooler and after cooler. Mode II is a compromise solution to achieve both relatively high RET and EVR when the electrical heater is installed in series only with the intercooler. Mode IV with a paralleling electrical heater has great flexibility to adapt different user demands. The integration of the ORC has a positive effect on system RTE and EVR.

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Section: Feed Pumpmentioning

confidence: 99%

Section: Feed Pumpmentioning

confidence: 99%

“…After which, off-design performance analysis and comparison results are shown in Section (30). Then, mathematic models and performance indices are included in Section 3.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance comparison of different combined heat and compressed air energy storage systems integrated with organic Rankine cycle

et al. 2019

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“…In addition, the implementation of new technologies and cycle modifications was introduced to improve the cycle performance. Mathematical and thermodynamic models of the integrated Rankine power cycle into the ERS were performed to estimate the effect of key parameters on the system performance [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Exergy and Exergoeconomic Analysis of a Cogeneration Hybrid Solar Organic Rankine Cycle with Ejector

Tashtoush

Morosuk

Chudasama

2020

Entropy

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Solar energy is utilized in a combined ejector refrigeration system with an organic Rankine cycle (ORC) to produce a cooling effect and generate electrical power. This study aims at increasing the utilized share of the collected solar thermal energy by inserting an ORC into the system. As the ejector refrigeration cycle reaches its maximum coefficient of performance (COP), the ORC starts working and generating electrical power. This electricity is used to run the circulating pumps and the control system, which makes the system autonomous. For the ejector refrigeration system, R134a refrigerant is selected as the working fluid for its performance characteristics and environmentally friendly nature. The COP of 0.53 was obtained for the ejector refrigeration cycle. The combined cycle of the solar ejector refrigeration and ORC is modeled in EBSILON Professional. Different parameters like generator temperature and pressure, condenser temperature and pressure, and entrainment ratio are studied, and the effect of these parameters on the cycle COP is investigated. Exergy, economic, and exergoeconomic analyses of the hybrid system are carried out to identify the thermodynamic and cost inefficiencies present in various components of the system.

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The feasibility study of the production of Bitcoin with geothermal energy: Case study

Ehyaei,

Esmaeilion,

Shamoushaki

et al. 2023

Energy Science & Engineering

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In this paper, a multigeneration cycle of electricity, cooling, and Bitcoin whose energy source is geothermal, has been subjected to energy, exergy, and economic analyses. The cycle under consideration includes the steam cycle (upstream cycle), the carbon dioxide cycle (downstream cycle), and the liquid–gas line to absorb the heat dissipated by the carbon dioxide cycle. In this cycle, the steam cycle condenser acts as the carbon dioxide cycle evaporator. Part of the electricity generated by this cycle is used to generate Bitcoins. Energy and exergy efficiencies at baseline (excluding Bitcoin production) are 45.8% and 38.1%, respectively. In this cycle, if more power is spent on producing Bitcoin as a product, the energy and exergy efficiencies of the cycle are reduced. Because Bitcoin itself is not valuable in terms of energy and exergy. Considering the average price of Bitcoin during the years 2015–2022 and if 100% of the electricity generated by the system is spent on Bitcoin production, the payback period in 2018, 2021, and 2022 when the price of Bitcoin is equal to $13,412.4, $21,398.8, and $47,743.0, respectively, are less than the baseline. Therefore, the production of Bitcoin with a variety of renewable energies can be considered as a solution. Of course, it should be noted that large changes in the price of Bitcoin can affect the issue of economic benefit.

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Off-design analysis of a CO2 Rankine cycle for the recovery of LNG cold energy with ambient air as heat source

Cited by 60 publications

References 34 publications

Performance comparison of different combined heat and compressed air energy storage systems integrated with organic Rankine cycle

Performance comparison of different combined heat and compressed air energy storage systems integrated with organic Rankine cycle

Exergy and Exergoeconomic Analysis of a Cogeneration Hybrid Solar Organic Rankine Cycle with Ejector

The feasibility study of the production of Bitcoin with geothermal energy: Case study

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