Study on the heating performance of absorption-compression hybrid heat pump in severe cold regions

Ji, Qiang; Han, Zhiqiang; Zhang, Xueping; Sun, Xiaoqing; Gui, Li; Li, Xiuming; Yang, Lingyan

doi:10.1016/j.applthermaleng.2020.116419

Cited by 34 publications

(5 citation statements)

References 38 publications

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“…The proposed system is composed of three subsystems: a solar thermal subsystem (STS), a liquid dehumidification subsystem (LDS), and an absorption refrigeration subsystem (ARS). For the STS, the heat transfer oil (HTO) is used to store the thermal energy from sunlight, whose temperature can increase from 80 to 250 °C . LiCl-H 2 O and LiBr-H 2 O are applied as the working pair for LDS and ARS, respectively …”

Section: Methodsmentioning

confidence: 99%

“…For the STS, the heat transfer oil (HTO) is used to store the thermal energy from sunlight, whose temperature can increase from 80 to 250 °C. 31 LiCl-H 2 O and LiBr-H 2 O are applied as the working pair for LDS and ARS, respectively. 32 In the STS, the compound parabolic concentrator is applied to gather solar energy, and the heat storage tank (HST) is used to store the energy from CPC and provide a stable heat source to the LDS and ARS.…”

Section: ■ Introductionmentioning

confidence: 99%

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Modeling and Optimization of a Solar-Driven System Coupled with Liquid Dehumidification and Absorption Refrigeration Based on Advanced Exergy and Exergoeconomic Analyses

Wang

Yang

et al. 2023

ACS Sustainable Chem. Eng.

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A novel hybrid system coupled liquid dehumidification with absorption refrigeration driven by solar energy is proposed. Traditional and advanced exergy and exergoeconomic analyses of the system are conducted to ascertain the degree of irreversibility and potential improvement for each component. Based on the advanced exergy and exergoeconomic analyses, the effects of air humidity, segment temperature, and refrigeration temperature on the total exergy destruction and cost rates of the system are obtained. The total avoidable exergy destruction rate, avoidable exergy destruction cost rate, and avoidable investment cost rate of the system are selected as objective functions and optimized by using nondominated sort genetic algorithm-II. The results show that the total exergy destruction rate and the total exergy destruction cost rate reach 262.39 kW and 8.563 $/h, respectively. The generator and regenerator have higher cost rates of the irreversibility overall system, achieving the values 3.536 and 2.430 $/h, respectively. The absorber has the highest investment cost rate in the whole system. The endogenous parts of the exergy destruction and cost rates are much higher than the exogenous parts in the system. Multiobjective optimization results show that optimal values for the total avoidable exergy destruction rate and the exergy destruction cost rate are 50.99 kW and 1.60 $/h, which are 4.15 and 9.14% lower than those calculated by single-objective optimization, respectively. This study provides a potential way to utilize solar energy for dehumidification and refrigeration.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Modeling and Optimization of a Solar-Driven System Coupled with Liquid Dehumidification and Absorption Refrigeration Based on Advanced Exergy and Exergoeconomic Analyses

Wang

Yang

et al. 2023

ACS Sustainable Chem. Eng.

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“…3 In view of their operating flexibility, the absorption chillers present the best alternative to conventional compression ma-chines, since on the one hand, they guarantee 4 a high efficiency for low thermal levels, and on the other hand, they are characterised by their low consumption of energy with lower maintenance cost viewing their robustness. 5 Moreover, the absorption machines used in air conditioning systems allow significant savings in electrical consumption compared to traditional mechanical compression machines. 6 Thus, international community has set itself the goal of halving greenhouse gas emissions by 2050 on a global scale.…”

Section: Introductionmentioning

confidence: 99%

Study of Spraying Technology on Absorber Performances in a H2O/LiBr Absorption Chiller

Maouche

Douani

Labbaci

et al. 2022

Kemija U Industriji

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For major thermal engines used in industrial sectors, the use of chillers has been growing steadily over the previous decades. Indeed, this is linked strongly to their large energy performance despite their investment costs, which are still high, in particular for low powers. Performance coefficients for absorption chillers are relatively low, and their profitability depends on the costs of the main equipment and more particularly on the price of the absorber. Several studies focusing on the development of mass contactors are underway with the principal objective of further improving their performance of mass and energy transfer. Relating to the mass and heat transfer, it is specified that the contact between the phases in circulation is ensured by different types of contactors. The transfer performance is correlated with the heat and mass transfer coefficient on the one hand, and the specific exchange area, i.e., the exchange area per unit volume of the contactor on the other hand. These contactors are distinguished by their mode of contact between phases (bubbling, spraying, falling film, etc.). While the exchange coefficient depends on the hydrodynamics regime in the contactor (flow regime and physicochemical properties of phases), the specific exchange area is dictated by its operating mode. Any limitation of its use for a specific application (physicochemical phenomena, such as crystallisation, deposited dust, etc.) requires research and development of better devices more adapted. Moreover, the most used contactors in chemical engineering are plate columns, packed columns, falling film columns, spray columns, etc. In order to intensify exchanges, a new absorber of the pulverised type is to be explored in relation with the physicochemical properties of the phases, and of their hydrodynamic flow conditions in the sprayed column. Therefore, an experimental study of the influence of operating variables (nozzle diameter, fluids flow rate, their concentrations, size of droplets, etc.) on the overall coefficient of mass transfer in gaseous phase in the absorber of the absorber chiller was conducted. After having fixed the pressure in the absorber, the first part of the study allowed developing new correlations linking the experimental results of the K G • a to all operating variables (  L,  G, d d , etc.). The second part was devoted to the simulation of the absorption chiller functioning by introducing the concept of energy and exergy yields based on the mass transfer correlations.Keywords H 2 O/LiBr binary system, liquid vapour equilibrium, hydrodynamics of the spray absorber, overall coefficient of mass transfer, modelling

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“…However, other correlations not depending on the NH 3 mass fraction of NH 3 -NaSCN solution have been developed by other researchers [23] , in order to maximise the COP of absorption refrigeration systems. In the same idea of maximising COP and ECOP, Ahmadi et al [24] , Ji et al [25] , Wakim and Rivera-Tinoco [26] , Azhar et al [27] have conducted separate studies on improving COP and ECOP from an energy balance. In the literature, some researchers have focused their studies on the improvement of absorption systems, using separately the commonly employed classical model [5] , [6] , [27] .…”

Section: Introductionmentioning

confidence: 99%

Analysis and improvement of the efficiency of NH3-NaSCN single effect absorption cooling system

Ngock

Tamba

Djanna

et al. 2022

Heliyon

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Study on the heating performance of absorption-compression hybrid heat pump in severe cold regions

Cited by 34 publications

References 38 publications

Modeling and Optimization of a Solar-Driven System Coupled with Liquid Dehumidification and Absorption Refrigeration Based on Advanced Exergy and Exergoeconomic Analyses

Modeling and Optimization of a Solar-Driven System Coupled with Liquid Dehumidification and Absorption Refrigeration Based on Advanced Exergy and Exergoeconomic Analyses

Study of Spraying Technology on Absorber Performances in a H2O/LiBr Absorption Chiller

Analysis and improvement of the efficiency of NH3-NaSCN single effect absorption cooling system

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