The new thermo-ecological performance optimization of an irreversible three-heat-source absorption heat pump

Wouagfack, Paiguy Armand Ngouateu; Tchinda, René

doi:10.1016/j.ijrefrig.2011.09.008

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…By employing the ECOP function, many studies have been done for different heat engine models [91][92][93][94][95][96]. The ECOP function defined for heat engines has been modified for irreversible three-heat-source absorption heat pump model which includes finite-rate heat transfer between the working fluid and the external heat reservoirs, heat leak from the heated space to the heat sink, and irreversibilities due to the internal dissipations of the working fluid by Ngouateu Wouagfack and Tchinda [97], as the ratio of heating load to the loss rate of availability: The ECOP give information about to the loss rate of availability or entropy generation rate in order to produce a certain heating load. It should be noted that for a certain heating load, the entropy generation rate is minimum at maximum ECOP condition.…”

Section: New Thermo-ecological Performance Optimization Techniquementioning

confidence: 99%

“…Ngouateu Wouagfack and Tchinda [97] determined analytically the maximum of the ecological performance criterion and the corresponding optimal coefficient of performance, heating load and entropy generation rate for a given total heat-transfer area of the heat exchangers. The corresponding optimal temperatures of the working fluid in the main components of the system and the optimal distribution of the heat-transfer areas were also obtained analytically.…”

Section: New Thermo-ecological Performance Optimization Techniquementioning

confidence: 99%

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Review on Performance Optimization of Absorption Heat Pump Systems Based on Finite-Time Thermodynamics

Wouagfack¹

2019

IJFMTS

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Most of industrial processes use a lot of thermal energy by burning fossil fuel to produce steam or heat for the purpose. After the processes, heat is rejected to the surrounding as waste. The absorption heat pump is becoming more important because it can be powered by these industrial energy wastes and hence, it poses no danger to the environment. In this paper, a literature review of the theoretical finite-time thermodynamic-based performance optimization of absorption heat pump systems independent of the used mixtures is presented. The review describes and discusses the performance objective functions for the various absorption heat pump cycle models. It covers the endoreversible and irreversible three-heat-source cycle models, four-heat-source cycle models and absorption heat transformer cycles with respect to the following aspects: the heat transfer law models, the effect of heat resistance and other irreversible loss models on the performance. Findings from published works considering the heating load, the coefficient of performance, the total heat transfer area, the thermo-economic function, the ecological function, the exergy-based ecological function and the ecological coefficient of performance as objective functions have been summarized in a table. It appears that design parameters based on the maximum of the ecological coefficient of performance conditions represent a best compromise between the heating load and the loss rate of availability.

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Section: New Thermo-ecological Performance Optimization Techniquementioning

confidence: 99%

Section: New Thermo-ecological Performance Optimization Techniquementioning

confidence: 99%

Review on Performance Optimization of Absorption Heat Pump Systems Based on Finite-Time Thermodynamics

Wouagfack¹

2019

IJFMTS

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“…ECOP is applied to the refrigeration cycle by Ust and Sahin , which is expressed as

ECOP = \frac{{\overset{true˙}{italicQ}}_{cool}}{{italicT}_{italica} {\overset{S}{true}}_{italicg}}

where

{\overset{true˙}{italicQ}}_{cool}

is the cooling load. Ngouateu Wouagfack and Tchinda conducted the performance optimization of absorption heat pump based on ECOP criterion, and the ECOP is defined as

ECOP = \frac{{\overset{true˙}{italicQ}}_{H}}{{italicT}_{italica} {\overset{S}{true}}_{italicg}}

where

{\overset{true˙}{italicQ}}_{H}

is the high‐temperature heat recovered by heat pump. ECOP can be explained as the ratio of the heating load to the loss rate of availability.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…where _ Q cool is the cooling load. Ngouateu Wouagfack and Tchinda [25] conducted the performance optimization of absorption heat pump based on ECOP criterion, and the ECOP is defined as…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Thermodynamic analysis of an isopropanol-acetone-hydrogen chemical heat pump

Guo

Huai

2014

Int. J. Energy Res.

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SUMMARY An isopropanol–acetone–hydrogen chemical heat pump is investigated in the ASPEN Plus shell, the influences of some important operation parameters on the six different evaluation criteria are presented, and the different evaluation criteria for the heat pump are also analyzed. The decrease of distillation to feed ratio improves the performance of the chemical heat pump, and the increase of endothermic reaction temperature improves the performance of heat pump based on first law of thermodynamics but weakens the performance of heat pump from the viewpoint of second law of thermodynamics. There exists an optimum reflux ratio in terms of enthalpy efficiency, entransy efficiency, and exergy efficiency, but the performance of heat pump deteriorates as the reflux ratio increases in terms of entropy generation number, revised entropy generation number, and ecological COP. The entransy efficiency tends to integrate the behaviors of enthalpy efficiency and exergy efficiency. Compared with entropy generation number, the behavior of revised entropy generation number is more consistent with the practice. Copyright © 2014 John Wiley & Sons, Ltd.

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“…The use of geothermal energy in livestock farms would help to solve the issues of different temperature regimes for different groups of animals. A design of a geothermal heating system must also take into account an ecological coefficient of performance (ECOP) (Wouagfack, Tchinda, 2012). This is a new evaluation criterion that estimates the utility of a heat pump not only from an economic, energetic and thermodynamical, but also from an ecological point of view (Kim, et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Alternative Energy Sources and Their Use in the Pig Breeding Farm During the Winter Period

Minajeva

2018

Proccedings of International Scientific Conference "RURAL DEVELOPMENT 2017"

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Investigations were carried out at the pig breeding farm located in Šalčininkai district. There are 9 hulls in the pig farm, two of which are dedicated to pig breeding. One barn was reconstructed: installed heated-cooled floor with the heat pump and a manure-slurry cooling system. The second barn was installed more than 50 years ago and has not been modernized yet. This hull doesn’t have mechanical cooling system, is heated by a gas heater, infrared rays are installed in the pig holders. Both barns have a mechanical air exhaust system. The research data were collected during the winter season. Also was collected statistical data on the birth rate, weight gain, morbidity and piglets’ death. The parameters of the old barn microclimate depended directly on outdoor air parameters. The average temperature in the old housing was 21 ° C, in the modernized 27 °C; humidity was 79% and 54% respectively. In the winter period, in the old barn, due to low air temperatures and high humidity, the piglets’ death was 7.8% upper and the weight gain of 35% lower than in the reconstructed barn. It has been determined that the microclimate parameters influence the growth of the weight of piglets, their fall, and morbidity. The installed heated-cooled floor and manure-slurry cooling systems allow the farm to not use other types of fuel, facilitate the maintenance of the microclimate parameters of the barn (maintenance of the design temperature all the year), reduce emissions of CO2 and NH3 into the environment, and receive higher revenues from growing and selling products.

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The new thermo-ecological performance optimization of an irreversible three-heat-source absorption heat pump

Cited by 21 publications

References 19 publications

Review on Performance Optimization of Absorption Heat Pump Systems Based on Finite-Time Thermodynamics

Review on Performance Optimization of Absorption Heat Pump Systems Based on Finite-Time Thermodynamics

Thermodynamic analysis of an isopropanol-acetone-hydrogen chemical heat pump

Analysis of Alternative Energy Sources and Their Use in the Pig Breeding Farm During the Winter Period

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