Modeling of a new absorption heat pump-transformer used to produce heat and power simultaneously

Hernández-Magallanes, J.A.; Heard, C.L.; Best, R.; Rivera, W.

doi:10.1016/j.energy.2018.09.074

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…Finally, Figure 13 shows the variation of the coefficients of performance as a function of the condensation and evaporation temperatures at a generation temperature of 56 • C. As was expected, further reducing the thermal source reduced the operating conditions of the half-effect cycle. This was mainly due to the crystallization range of the working mixture, which restricted the operation of the thermodynamic cycle [31]. For these conditions, it was no longer possible to operate the thermodynamic cycle at condensation temperatures above 35 • C. Figures 14 and 15 show the analysis of the exergy efficiency for the operating conditions established in Table 2.…”

Section: Analysis Of Cop Of the Half-effect Cyclementioning

confidence: 99%

“…As was expected, further reducing the thermal source reduced the operating conditions of the half-effect cycle. This was mainly due to the crystallization range of the working mixture, which restricted the operation of the thermodynamic cycle [31]. For these conditions, it was no longer possible to operate the thermodynamic cycle at condensation temperatures above 35 °C.…”

Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 99%

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Thermodynamic Analysis of a Half-Effect Absorption Cooling System Powered by a Low-Enthalpy Geothermal Source

et al. 2019

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A thermodynamic analysis of a half-effect absorption cooling system powered by a low-enthalpy geothermal source was carried out. This paper presents modeling of the half-effect absorption cooling system operating with an ammonia/lithium nitrate mixture and based on the first and second laws of thermodynamics, using as energy inputs real data from two geothermal wells located at Las Tres Vírgenes volcanic complex, Baja California Sur, México. Plots of coefficients of performance and exergy efficiency against condenser, evaporator, and generator temperatures are presented for the half-effect cooling system. The results showed that the system was able to operate at generation temperatures between 56 and 70 °C, which were supplied by the geothermal wells in order to produce cooling at temperatures as low as −16 °C, achieving coefficients of performance between 0.10 and 0.36, while the exergy efficiency varied from 0.15 to 0.40 depending on the system operating temperatures.

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Section: Analysis Of Cop Of the Half-effect Cyclementioning

confidence: 99%

Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 99%

Thermodynamic Analysis of a Half-Effect Absorption Cooling System Powered by a Low-Enthalpy Geothermal Source

et al. 2019

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“…On the other hand, Hernández-Magallanes et al [20] proposed a new cycle integrating a heat transformer with a heat pump capable of producing electric power and useful heat, simultaneously. This cycle was modeled considering its operation with the working pair NH 3 -LiNO 3 .…”

Section: Theoretical Investigations About Advanced Heat Transformersmentioning

confidence: 99%

Modeling of a Double Effect Heat Transformer Operating with Water/Lithium Bromide

2019

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Absorption heat transformers are effective systems for a wide variety of applications; however, their main purpose is to upgrade thermal energy from several sources at low-temperature up to a higher temperature level. In the literature, several advanced configurations for absorption heat transformers have been reported which are mainly focused on the improvement of the gross temperature lift by the use of a double absorption process; however, these systems usually offer a reduced coefficient of performance. The present study proposes a new advanced configuration of an absorption heat transformer that improves the coefficient of performance utilizing a double generation process. The operation of the new configuration was numerically modeled, and the main findings were discussed and presented emphasizing the effect of several parameters on the system performance. The highest coefficient of performance and gross temperature lift were 0.63 and 48 °C, respectively. From its comparison with a single-stage heat transformer, it is concluded that the proposed system may achieve coefficient of performance values up to 25.8% higher than those obtained with the single-stage system, although achieving lower gross temperature lifts.

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Geothermal Energy Application in Cooling and Heat Pump

Zhao,

Zhang,

Liu

et al. 2024

Encyclopedia of Renewable Energy, Sustainability and the Environment

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Modeling of a new absorption heat pump-transformer used to produce heat and power simultaneously

Cited by 14 publications

References 33 publications

Thermodynamic Analysis of a Half-Effect Absorption Cooling System Powered by a Low-Enthalpy Geothermal Source

Thermodynamic Analysis of a Half-Effect Absorption Cooling System Powered by a Low-Enthalpy Geothermal Source

Modeling of a Double Effect Heat Transformer Operating with Water/Lithium Bromide

Geothermal Energy Application in Cooling and Heat Pump

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