Investigation the effects of different heat inputs supplied to the generator on the energy performance in diffusion absorption refrigeration systems

Ersöz, Mustafa

doi:10.1016/j.ijrefrig.2015.02.013

Cited by 26 publications

(9 citation statements)

References 22 publications

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“…It is found to give a better prediction of the real operation of the refrigerator. Ersoz et al [16] investigated experimentally the effect of three different generator heat inputs (62, 80 and 115W) on the energy performance of the DAR.…”

Section: Introductionmentioning

confidence: 99%

Dynamic testing and modeling of a diffusion absorption refrigeration system

Jemaa

Mansouri

Bellagi

2016

International Journal of Refrigeration

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Section: Introductionmentioning

confidence: 99%

Dynamic testing and modeling of a diffusion absorption refrigeration system

Jemaa

Mansouri

Bellagi

2016

International Journal of Refrigeration

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“…These include, first of all, recommendations on heat-moisture modes in regions with the predominant use of systems for obtaining water from atmospheric air [24]: an ambient temperature of 32-34 °C and a dew point temperature of up to 15 °C. For such operating conditions of the scheme given in [20], taking into account our experience [25,26], as well as the results from experimental work by other researchers [27][28][29][30][31][32][33][34][35][36][37][38], we can accept the initial data parameters: a) a lower (higher) evaporation temperature ν min (ν max ) of minus 5 °C (5 °C); b) full pressure in ARU, which ensures the condensation of ammonia vapor when heat is diverted to the environment under a natural convection mode is Р=2.0 MPa; c) the difference in the pressures of the saturated ammonia liquid and the partial pressure of ammonia vapor in SGM at the inlet of the vaporizerthe outlet of the absorber is ∆P H =0.10 MPa, and at the outlet of the vaporizerthe inlet to the solution vaporizer is ∆P B =0.05 MPa; ∆P B =0.35 MPa; d) the difference of the partial pressure of ammonia vapor in SGM and the pressure of the saturation of a weak (strong) AWS in the absorber is 0.10 (0.05) MPa; e) the temperature of the environment (atmospheric air) is t a =32 °C); f) the temperature difference between the environment and the absorber's wall at the inlet and outlet of the AWS is, respectively, ∆t 1 =10 °C and ∆t 2 =14 °C.…”

Section: Materials and Methods To Study The Thermodynamic Parameters Of An Autonomous Absorption Refrigeration Unit Cyclementioning

confidence: 99%

Improving energy efficiency of the systems for obtaining water from atmospheric air

Bilenko¹,

Тітлов²

2021

EEJET

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This paper outlines the prospect of obtaining water from atmospheric air by cooling it to the dew point temperature using refrigeration machines in order to partially reduce water scarcity in the arid regions of our planet. To minimize energy costs in the systems for obtaining water from atmospheric air, it is proposed to utilize solar energy with absorption refrigeration units (ARUs) acting as a source of artificial cold. The characteristic thermodynamic processes have been analyzed in a modernized ARU, capable of working at a lower thermal energy source's temperature than its analogs. The possibility has been studied to reduce the temperature of the heat source by including a solution vaporizer in the ARU scheme. The analysis involved an authentic method based on the balance of specific streams of ARU working body components and actual boundary conditions at characteristic points of the cycle. A limit was shown for the level of a minimum boiling temperature in the ARU generator (from 90 °C) when the systems for obtaining water from atmospheric air are operated under current climatic conditions. The simulation of heat-and-mass exchange processes during contact interaction between a steam-gas mixture and ammonia water solution was carried out. Based on variant calculations, it has been shown that the proposed ARU structure with an adiabatic solution vaporizer could work as part of systems to obtain water from atmospheric air at a hot spring temperature above 100 °C and constructively enough fits into the element base of standard models. It has been proposed to use two types of solar thermal energy sources to operate ARU. In a tropical climate, with vacuum solar collectors or solar energy hubs; in a temperate climate zone, with solar collectors with water as a heat carrier

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“…This limitation is associated with the problems of completely removing of the vapor-gas mixture from the reflux condenser and condenser into the absorber and evaporator during the starting period. With a larger pipe diameter, the front of the gas-vapor mixture is degraded, some of the inert gas remains in the reflux and condensation zones and significantly reduces the intensity of these processes [5,11].…”

Section: Energy Sciencementioning

confidence: 99%

“…Their advantages are also the minimal cost in comparison with existing types of household refrigeration equipment [5].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Thermal Modes of the Reflux Condenser of the Absorption Refrigeration Unit

Kholodkov

Тітлов

2017

EUREKA: Physics and Engineering

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Currently, developers of modern refrigeration equipment, in accordance with the plans of the UN, are moving to natural refrigerants (hydrocarbons, carbon dioxide and ammonia) that do not have an adverse technological impact on the ecosystem of the planet. In domestic refrigeration technology, one of the options is absorption refrigeration units, the working body of which is an aqueous ammonia mixture with the hydrogen addition. Having a number of unique advantages over compression analogs, absorption systems are characterized by lower energy characteristics.As the analysis shows, the maximum thermodynamic losses in the absorption aggregates are concentrated in the generating unit when the ammonia is evaporated, it is purified from water vapor and transported to the evaporator. In this connection, the mathematical modeling of the thermal regimes of the reflux condenser is performed, which is responsible for purification and transportation of ammonia vapor.Modeling is carried out on standard designs of absorption refrigeration units taking into account reasonable assumptions and results of own experimental researches. A cellular model is used. Stationary operating modes are modeled due to the high thermal inertia of the processes in the reflux condenser.As a result, the perspective of the thermal insulation installation throughout the reflux section is shown, which makes it possible to increase the energy efficiency by 17...22 %.

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Investigation the effects of different heat inputs supplied to the generator on the energy performance in diffusion absorption refrigeration systems

Cited by 26 publications

References 22 publications

Dynamic testing and modeling of a diffusion absorption refrigeration system

Dynamic testing and modeling of a diffusion absorption refrigeration system

Improving energy efficiency of the systems for obtaining water from atmospheric air

Modeling of Thermal Modes of the Reflux Condenser of the Absorption Refrigeration Unit

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