Thermodynamic cycles for the simultaneous production of power and cooling: A comprehensive review

Pacheco‐Reyes, Alejandro; Rivera, W.

doi:10.1002/er.6621

Cited by 7 publications

(4 citation statements)

References 115 publications

(283 reference statements)

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“…Mass balance for a control volume in steady state:

{\overset{\sum m}{true}}_{italicin} = {\overset{\sum m}{true}}_{italicout}

The first law of thermodynamics for a control volume in steady state, neglecting variations of kinetic and potential energies:

0 = {\overset{Q}{true}}_{italicCV} - {\overset{W}{true}}_{italicCV} + \sum ({\overset{m}{true}}_{italicin} . h_{italicin}) - \sum ({\overset{m}{true}}_{italicout} . h_{italicout})

Isentropic power for a turbine:

\dot{W} = \frac{\dot{m} [{((), h)}_{italicin} - {((), h)}_{italicout}]}{η_{turbine}}

The first law efficiency for power cycles:

η = \frac{{\dot{W}}_{net}}{{\dot{Q}}_{fuel}}

Equation (4) is used only for power generation cycles. However, the energy utilization factor (EUF) is the most appropriate parameter for cogeneration systems, 19 as is the case of this installation.…”

Section: Methodsmentioning

confidence: 99%

“…For a cyclic thermal machine 17 :

EUF = \frac{\dot{W} + {\overset{Q}{true}}_{u}}{{\dot{Q}}_{B}}

For an open thermal machine 17,19 :

EUF = \frac{\dot{W} + {\overset{Q}{true}}_{u}}{\overset{F}{true}}

Where Ẇ is the power production;

\dot{Q}

u is the useful heat transfer rate;

\dot{Q}

B represents the rate of energy obtained from some thermal waste, such as gases from a combustion process; and

\dot{normalF}

is the rate of chemical energy obtained from a fuel (product of the fuel mass flow and the lower heating value).…”

Section: Methodsmentioning

confidence: 99%

“…Equation ( 4) is used only for power generation cycles. However, the energy utilization factor (EUF) is the most appropriate parameter for cogeneration systems, 19 as is the case of this installation. For a cyclic thermal machine 17 :…”

Section: Modeling Of the Proposed Systemsmentioning

confidence: 99%

See 2 more Smart Citations

Simulation studies of the existing cogeneration system and alternative conceptions to improve the energy efficiency for an ethylene petrochemical plant

Silva

Martins

Gallego

et al. 2022

Intl J of Energy Research

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Summary Energy efficiency is relevant for the competitiveness and growth of global industries. In this way, simulation studies aiming to increase energy efficiency can be useful for both retrofitting and greenfield projects. Few ethylene process licensors hold the technologies; however, they present different proposals for projects with varying energy efficiency and integration degrees. In the present work, simulation studies of the cogeneration system of a petrochemical plant located in Brazil were performed in order to identify alternative configurations to increase the electricity production without affecting the heat supply to meet the process thermal demand. The cogeneration system of the analyzed plant includes an electric energy conversion system composed of turbo‐generators, back‐pressure and extraction/condensing steam turbines driving electricity generators, compressors and pumps, and heat exchangers. The simulation studies were performed using the HYSYS software to simulate design conditions and validate the model with the actual plant's experimental measurements. New cogeneration configurations were proposed in subsequent simulations, aiming at increasing electricity generation. In addition, exergetic efficiency and environmental analysis of the simulated configurations and an economic estimate for the most efficient proposal were performed. The results showed that the best alternative improved the electricity generation, increased the energy utilization factor by up to 16.2%, reduced greenhouse gas emissions by 22.8%, increased global exergetic efficiency by 28.9% and decreased the steam production and cold utility consumption of the cogeneration system compared to the design conditions.

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“…Mass balance for a control volume in steady state:

{\overset{\sum m}{true}}_{italicin} = {\overset{\sum m}{true}}_{italicout}

The first law of thermodynamics for a control volume in steady state, neglecting variations of kinetic and potential energies:

0 = {\overset{Q}{true}}_{italicCV} - {\overset{W}{true}}_{italicCV} + \sum ({\overset{m}{true}}_{italicin} . h_{italicin}) - \sum ({\overset{m}{true}}_{italicout} . h_{italicout})

Isentropic power for a turbine:

\dot{W} = \frac{\dot{m} [{((), h)}_{italicin} - {((), h)}_{italicout}]}{η_{turbine}}

The first law efficiency for power cycles:

η = \frac{{\dot{W}}_{net}}{{\dot{Q}}_{fuel}}

Section: Methodsmentioning

confidence: 99%

“…For a cyclic thermal machine 17 :

EUF = \frac{\dot{W} + {\overset{Q}{true}}_{u}}{{\dot{Q}}_{B}}

For an open thermal machine 17,19 :

EUF = \frac{\dot{W} + {\overset{Q}{true}}_{u}}{\overset{F}{true}}

Where Ẇ is the power production;

\dot{Q}

u is the useful heat transfer rate;

\dot{Q}

B represents the rate of energy obtained from some thermal waste, such as gases from a combustion process; and

\dot{normalF}

is the rate of chemical energy obtained from a fuel (product of the fuel mass flow and the lower heating value).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Simulation studies of the existing cogeneration system and alternative conceptions to improve the energy efficiency for an ethylene petrochemical plant

Silva

Martins

Gallego

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…To further improve the performance factor of the system, some studies use the double-effect ammonia-water absorption refrigeration (DAAR) cycle instead of single-effect ARC for research. A double-effect absorption system is composed of two solution circuits in which the heat delivered by the high-temperature absorber is used to feed the low-temperature generator to produce more refrigerant without an extra heat supply, which makes DAAR systems generally more efficient than single-effect ARC systems [26]. Some studies on CCP systems integrated by the Kalina cycle and DAAR are examined as the following.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a New Combined Cooling and Power System Coupled by the Kalina Cycle and Ammonia–Water Absorption Refrigeration Cycle

Wang¹,

Wang²,

Liu³

et al. 2022

Sustainability

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In order to improve the utilization efficiency of low-temperature heat sources, a new combined cooling and power system using ammonia–water is proposed. The system combines Kalina cycle with absorption refrigeration cycle, in which the waste heat of the Kalina cycle serves as the heat source of the absorption refrigeration cycle. The steady-state mathematical model of system is established in detail first, and then the simulation results of design condition are obtained, which show that the thermal efficiency and exergy efficiency can reach 24.62% and 11.52%, respectively. Based on the system design condition, an exergy destruction analysis is conducted and shows that four heat exchangers and the turbine contribute most of the total exergy destruction. Finally, the effects of five key parameters on the system performance are examined, which reveal that within certain ranges, there is an optimal turbine inlet pressure that makes the exergy efficiency maximal. Increasing the ammonia–water temperature at the vapor generator outlet and the ammonia-weak solution temperature at the bottom outlet of the rectification column will reduce the thermal efficiency but raise the exergy efficiency. With the increase of rectification column pressure, both the thermal efficiency and exergy efficiency drop, while the evaporation pressure has an opposite effect on the system performance.

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Thermodynamic analysis of the combined organic flash and ejector refrigeration cycle using zeotropic mixtures

Zhao

et al. 2023

Applied Thermal Engineering

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Thermodynamic cycles for the simultaneous production of power and cooling: A comprehensive review

Cited by 7 publications

References 115 publications

Simulation studies of the existing cogeneration system and alternative conceptions to improve the energy efficiency for an ethylene petrochemical plant

Simulation studies of the existing cogeneration system and alternative conceptions to improve the energy efficiency for an ethylene petrochemical plant

Thermodynamic Analysis of a New Combined Cooling and Power System Coupled by the Kalina Cycle and Ammonia–Water Absorption Refrigeration Cycle

Thermodynamic analysis of the combined organic flash and ejector refrigeration cycle using zeotropic mixtures

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