Dynamic testing and modeling of a diffusion absorption refrigeration system

Jemaa, Radhouane Ben; Mansouri, Rami; Bellagi, A.

doi:10.1016/j.ijrefrig.2016.03.008

Cited by 13 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, recent investigations of a small capacity DAR in our research unit [16,31,37] show that the steady-state temperature measured in various locations of the refrigerator are comparable to those calculated by the model for similar operating conditions. For example, the mean evaporator temperature predicted by the present model for a driving heat temperature of 177 C is À16 C, fairly comparable to the temperature measured: À19 C at the evaporator for 180 C in the generator.…”

Section: Dar Simulation In Basic Operating Conditionssupporting

confidence: 64%

Detailed thermodynamic analysis of a diffusion-absorption refrigeration cycle

Taieb

Mejbri

Bellagi

2016

Energy

Self Cite

View full text Add to dashboard Cite

Section: Dar Simulation In Basic Operating Conditionssupporting

confidence: 64%

Detailed thermodynamic analysis of a diffusion-absorption refrigeration cycle

Taieb

Mejbri

Bellagi

2016

Energy

Self Cite

View full text Add to dashboard Cite

“…Previous experimental studies by Mazouz et al (2014) andBen Jemaa et al (2016), among others, have noted that the starting characteristic of DAR systems varies significantly with heat input rate. During the start-up process, the solution in the generator is heated until it transitions from nucleate boiling to a state where significant bubble coalescence takes place to provide lifting of the liquid solution through the entire length of the bubble pump.…”

Section: Gas Heat Exchangermentioning

confidence: 99%

Testing and Simulation of a Solar Diffusion-Absorption Refrigeration System for Low-Cost Solar Cooling in India

Freeman¹,

Najjaran²,

Edwards³

et al. 2017

Proceedings of SWC2017/SHC2017

View full text Add to dashboard Cite

Solar cooling technologies have the potential to improve crop and vaccine supply chain management in areas with unreliable access to an electricity distribution network. The diffusion absorption refrigeration (DAR) cycle is a technology of interest for cooling in rural areas and developing countries due to its low capital cost, low maintenance requirements, and unique design in which the requirement for electrically-driven components are fully omitted. The main feature of DAR systems is a thermally driven bubble pump that is used to circulate the refrigerant and absorbent fluid components around the system. In this paper, we present results from a laboratory DAR system operating over a range of pressures and heat input rates with ammonia-water-hydrogen as the working fluid. By reducing the system pressure from 21 bar to 14 bar, a 17% increase in maximum coefficient of performance (COP) is reported, and the system start-up time is reduced by up to 58%. The results are used to calibrate a thermal model of a solar-DAR system, which is then used to determine the optimal system pressure and solar collector array configuration for summer operation in the location of Chennai, India.Recent research has considered how the DAR cycle can be adapted for use in a lower temperature range with solar thermal collectors. Approaches considered include the use of alternative working fluids (Zohar et al. 2009, Ben Ezzine et al. 2010, Acuña et al., 2013 and the configuration of the generator and bubble pump (Zohar et al. 2008, Damak et al., 2010. The UK company Solar-Polar has recently developed a solar-DAR system for use in rural cold chain applications. A field-test of the system is currently in preparation at Anna University in Chennai, India (see Fig. 2), where fifteen modular roof-top units will be used to provide cooling to a 34 m 3 insulated cold store. Each unit provides a nominal 60-70 W of cooling from a 0.72 m 2 array of solar heat pipe collectors. A one-year monitoring study will be undertaken in order to assess the seasonal performance of the system.

show abstract

“…Ben Jamaa et al [16] adopted a black-box model approach to describe the relationship between the refrigerator behavior for each heat input. They reported that a first order transfer function is an adequate model between the input and output of the machine in start-up mode.…”

Section: Introductionmentioning

confidence: 99%

Inert Gas and Refrigerating Vapor Mass Flow Rates Ratio: A Much Promising Parameter for Diffusion-Absorption-Refrigeration Systems Performances Evaluation

Zebbar¹,

Zebbar²,

Kherris³

et al. 2021

MMEP

View full text Add to dashboard Cite

This paper is consecrated to the thermodynamic study and analysis of diffusion-absorption-refrigeration (DAR) plants. The mass and energy balances analysis at the evaporator has allowed to highlight a new and original parameter, which can be used to analyze DAR system performances. It is the ratio of inert gas to refrigerant vapor mass flow rates at the evaporator inlets. This coefficient, which expression has been for the first time deduced mathematically, informs about the quality of the cycle and its performance, which are deeply affected by the growth of the inert gas flow energy expended to drive the refrigerant through the evaporator. The study shows that the coefficient of performance is decreasing with the increase of the mass flow rates ratio. The latter can be also used to find the optimal operating mode for the DAR machine with a specified working fluid.

show abstract

Dynamic testing and modeling of a diffusion absorption refrigeration system

Cited by 13 publications

References 20 publications

Detailed thermodynamic analysis of a diffusion-absorption refrigeration cycle

Detailed thermodynamic analysis of a diffusion-absorption refrigeration cycle

Testing and Simulation of a Solar Diffusion-Absorption Refrigeration System for Low-Cost Solar Cooling in India

Inert Gas and Refrigerating Vapor Mass Flow Rates Ratio: A Much Promising Parameter for Diffusion-Absorption-Refrigeration Systems Performances Evaluation

Contact Info

Product

Resources

About