Adsorption refrigeration technology – An overview of theory and its solar energy applications

Abstract. In the present work, the performance of an adsorption refrigerator driven by a solar collector was investigated. The adsorbent used in this study was 6.5 kg ordinary granular activated carbon of coconut shell produced in the Sumatera Utara province of Indonesia, 3 liters of methanol as adsorbate and 4.5 litres of water as the medium that was cooled. The experiments were carried out under varying weather conditions during seven cycles with total solar radiation about 2.681-3.918 kWh/m 2 /cycle. In this study, the values of the coefficient of performance (COP) obtained were about 0.0827-0.1271. The values of specific cooling power (SCP) obtained were in the range of 0.01839-0.01883 kW/kg. The experimental results show that the adsorption refrigerator system can deliver an evaporator temperature of about 2.81-13.61°C.

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“…The COP value of an adsorption refrigerator driven by a solar collector can be obtained using the following Eq. (1) [11,12]:…”

Section: Introductionmentioning

confidence: 99%

A Study on Adsorption Refrigerator Driven by Solar Collector Using Indonesian Activated Carbon

Sitorus

Napitupulu

Ambarita

2017

J. Eng. Technol. Sci.

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“…Many companies that produce solar powered adsorption refrigerators have to stop production. For example, SunMark, BLM, Zeopower company (USA), EG Solar (Germany), Solaref (France), unsuccessfully attempted to commercialize intermittent solar adsorption refrigerators using zeolite water pair [20].…”

Section: Commercial Application Of Adsorptive Refrigeratorsmentioning

confidence: 99%

The cooling effect by adsorption-desorption cycles

Wolak

2017

E3S Web Conf.

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Abstract. Adsorption appliances may turn out to be an alternative to compression-type refrigerators. The adsorption refrigeration machine may be driven by a low-grade heat source, especially solar energy. Solar adsorption cooling systems are environment-friendly and have zero ozone depletion potential. Therefore, the adsorption refrigeration is one kind of energy saving refrigeration methods. The merits of the adsorption refrigeration systems will be more significant especially when it is used in vehicles (automobiles, ships and locomotives), to preserve food and medicines and in air-conditioning. The paper presents the advantages and disadvantages as well as the evolution of the technology of adsorptive refrigeration systems. The methods of improving of adsorption refrigeration systems through improvements in adsorbents properties, use of advanced cycles and hybrid systems is also presented. Possible applications and perspectives for development of adsorption cooling systems are also analyzed. The paper describes a test stand of the adsorption-desorption refrigeration. The present investigations have been carried out utilizing the activated carbon granules as an adsorbent and methanol as an adsorbate. The paper demonstrates the measurement of temperature changes in the adsorbent bed and condenser during adsorption-desorption cycles.

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“…Adsorption refrigeration systems, as one of the promising effective energy conservation techniques and environmentally friendly applications, have been widely studied since the 1970s due to the oil crisis [1]. In comparison to vapor compression refrigeration systems, adsorption refrigeration systems can be driven by low-grade thermal energy sources, such as solar energy, geothermal energy, waste heat from industries/automobiles/fuel cells/combined heat and power systems (CHP) etc., instead of electricity consumed by a compressor, and therefore have large energy conservation potential.…”

Section: Introductionmentioning

confidence: 99%

Performance of an Activated Carbon-Ammonia Adsorption Refrigeration System

Zeng¹,

Huang²,

Kobayashi³

et al. 2017

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An experimental study of the adsorption performances of NH 3 on several commercial activated carbons was described. Firstly, the specific surface area, pore size distribution and morphological structure of the activated carbons have been characterized by N 2 adsorption, Scanning Electron Microscope (SEM), and X-ray diffraction (XRD). The adsorption capacities of four kinds of activated carbons were compared based on adsorption isotherms at 30˚C. Results show that a type of activated carbon MSC30 with high adsorption capacity of NH 3 is a promising adsorbent for NH 3 because of its large specific surface area and high pore volume. Secondly, the effect of adsorption temperature on the adsorption capacity of NH 3 on MSC30 was investigated. A modified Dubinin-Astakhov equation was employed to describe the adsorption isotherms, with the reliability and accuracy evaluation. The isosteric heat of adsorption of MSC30-NH 3 as a function of the amount adsorbed was calculated applying the Clausius-Clapeyron equation with isotherms obtained at 20˚C and 30˚C. Thirdly, a packed-bed type adsorber was used to evaluate the influence of cycle time on the system cooling performance (coefficient of performance, specific cooling performance, and volumetric cooling performance) of the MSC30-NH 3 pair at the evaporating temperatures of 5˚C, 10˚C and 15˚C with a fixed adsorption/condensing temperature and desorption temperature of 30˚C and 80˚C, respectively. Finally, a long term operation without degradation for MSC30-NH 3 adsorption was experimentally demonstrated from the 80 consecutive adsorption-desorption cycles.

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Adsorption refrigeration technology – An overview of theory and its solar energy applications

Cited by 136 publications

References 106 publications

A Study on Adsorption Refrigerator Driven by Solar Collector Using Indonesian Activated Carbon

A Study on Adsorption Refrigerator Driven by Solar Collector Using Indonesian Activated Carbon

The cooling effect by adsorption-desorption cycles

Performance of an Activated Carbon-Ammonia Adsorption Refrigeration System

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