Performance characterization of a bubble pump for vapor absorption refrigeration systems

Aman, Julia; Henshaw, Paul; Ting, David S.‐K.

doi:10.1016/j.ijrefrig.2017.09.011

Cited by 13 publications

(12 citation statements)

References 24 publications

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“…The partial pressure effect of the equilibrium gas in the evaporator can make the liquid ammonia obtain a lower partial pressure under the condition of constant total pressure so that the evaporation process can be accomplished without a throttling valve. The solution is circulated by a bubble pump based on the principle of thermosiphon (Aman et al, 2018), and both the gas and liquid loops are achieved by gravity. In this case, the liquid level control is passive and the system reliability can be improved.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of a Forced Flow Diffusion Absorption Refrigeration System for Fishing-Boat Exhaust Waste Heat Utilization

2021

Front. Energy Res.

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Ammonia water absorption refrigeration systems are effective in utilizing fishing-boat exhaust waste heat for cryopreservation. However, the liquid level control and the use of a solution pump characterized by small flowrate and high-pressure head result in poor reliability in the traditional system. Besides, the system must necessarily be designed anti-swaying and anti-corrosion. This paper proposes a forced flow diffusion absorption refrigeration system, in which an inherently leak-free canned motor pump and an ejector are employed to provide the driving forces of the gas and liquid loops. The approximate single pressure operation allows for a simple passive liquid sealing control without throttling valves. The system adopts an integrated cooling strategy which allows the system to operate under swaying conditions, and the external seawater cooled heat exchanger avoids internal corrosion and leakage. The thermal analysis shows the system is valid to be operated under wide operating conditions, and the coupled gas and solution circulation ratios determined the performance of the novel system. There is an optimal ammonia mass fraction difference in the gas loop to obtain the optimal COP. The COP reaches 0.4 when the temperatures at the outlets of the generator, evaporator, absorber, and condenser are 160, −15, 35, and 35°C, respectively. The novel system provides a reliable absorption refrigeration system design for fishing-boat applications.

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Section: Introductionmentioning

confidence: 99%

Thermal Analysis of a Forced Flow Diffusion Absorption Refrigeration System for Fishing-Boat Exhaust Waste Heat Utilization

2021

Front. Energy Res.

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“…An analytical model developed [6] showed that the bubble pump is more effective for the slug regime. An analytical thermodynamic model was developed [7] using different working fluids and one-dimensional numerical simulation. The bubble pump efficiency decreases with the pressure along its length [8].…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics parametric investigation for two-phase flow of ammonia-water mixing in bubble pump tube

2021

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Two-dimensional numerical simulation of two-phase ammonia/water flowing under uniformly heated tube is used. ANSYS Fluent is used to predict the time evolution of thermal and hydrodynamic parameters of the bubble pump. Phase-dependent turbulent models are used to calculate the turbulent viscosity of each phase. Through User-Defined Functions, different interfacial force models and the wall boiling model are implemented in the code. The simulation results show a slow oscillation of hydrodynamic parameters such as pressure, mass flux, vapour velocity and liquid velocity during the initial stage of operation; however, a vigorous oscillation is detected for the temperature behaviour. The amplitude and period of oscillation decrease with the heat input increasing. By using the void fraction contour, it is possible to predict the flow regime along the bubble pump at different times of the operation. The domination of flow regime is the function of heat flux too. It is bubbly to slug for heat fluxes less than 5kW/m² and transits from churn to annular for 15 and 50kW/m² of heat flux.

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“…Papers that studied bubble pumps that used in Einstein refrigeration system or other vapour absorption refrigeration systems are relatively common compared to the investigation of Einstein refrigeration system alone. Researchers from University of Windsor, Canada modelled and analysed the performance of bubble pump for a vapour absorption refrigeration system [17][18][19]. Lin et al, [20] from Institute of Refrigeration Technology, China, studied the bubble pump with the configuration of multiple tubes.…”

Section: Introductionmentioning

confidence: 99%

Empirical Modelling of Einstein Absorption Refrigeration System

Chan

Lim

2020

ARFMTS

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A single pressure absorption refrigeration system was invented by Albert Einstein and Leo Szilard nearly ninety-year-old. The system is attractive as it has no mechanical moving parts and can be driven by heat alone. However, the related literature and work done on this refrigeration system is scarce. Previous researchers analysed the refrigeration system theoretically, both the system pressure and component temperatures were fixed merely by assumption of ideal condition. These values somehow have never been verified by experimental result. In this paper, empirical models were proposed and developed to estimate the system pressure, the generator temperature and the partial pressure of butane in the evaporator. These values are important to predict the system operation and the evaporator temperature. The empirical models were verified by experimental results of five experimental settings where the power input to generator and bubble pump were varied. The error for the estimation of the system pressure, generator temperature and partial pressure of butane in evaporator are ranged 0.89-6.76%, 0.23-2.68% and 0.28-2.30%, respectively. In addition, all the estimated generator temperatures and partial pressures of butane are within the error bar range that derived from the standard deviation of the experimental results.

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Performance characterization of a bubble pump for vapor absorption refrigeration systems

Cited by 13 publications

References 24 publications

Thermal Analysis of a Forced Flow Diffusion Absorption Refrigeration System for Fishing-Boat Exhaust Waste Heat Utilization

Thermal Analysis of a Forced Flow Diffusion Absorption Refrigeration System for Fishing-Boat Exhaust Waste Heat Utilization

Computational fluid dynamics parametric investigation for two-phase flow of ammonia-water mixing in bubble pump tube

Empirical Modelling of Einstein Absorption Refrigeration System

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