Simulation and design of a solar driven thermochemical refrigerator using new chemisorbents

Aristov, Yu. I.; Chalaev, Djamal; Dawoud, Belal; Heifets, L. I.; Popel, O. S.; Restuccia, G.

doi:10.1016/j.cej.2007.03.070

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…A single-purpose desalinator is operated at T red = 0, where no temperature lift for cooling is desired. Whereas, T red increases depending on the cooling application [34], i.e. in air-conditioning T red < 0.3 or in refrigeration T red > 0.3.…”

Section: Performance Indicatorsmentioning

confidence: 99%

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Olkis

Brandani

Santori

2019

Chemical Engineering Journal

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Adsorption heat transformers use low-grade heat to produce potable water and provide cooling at the same time. In this study, we present a comprehensive performance analysis for an experimental system featuring the world's smallest design using silica gel, which is commonly used as benchmarking material. We analyse the system performance in a thorough cycle analysis that quantifies the influence of isosteric heating times and cycle times onto the adsorption working capacity. In addition, the performance is assessed through common performance indicators for desalination as well as cooling. We found that the system achieved a Specific Daily Water Production of up to 10.9 kg w /(kg sg d) at 80°C. The combination of cooling and desalination is discussed highlighting advantages as well as disadvantages, which are often neglected. The results show that silica gel has a high performance in desalination, which decreases by more than 60 % if cooling is desired as well.

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Section: Performance Indicatorsmentioning

confidence: 99%

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Olkis

Brandani

Santori

2019

Chemical Engineering Journal

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“…Lemmini and Errougani [20] tested a single-bed methanol-activated carbon (AC-35) adsorption unit powered by a flat plate collector. Several experiments were conducted, achieving a maximum solar COP between 0.05 and 0.08 and a minimum temperature of −11 • C. Aristov et al [21] evaluated simulations of their solar refrigeration system developed based on a closed adsorption cycle. Among several chemisorbents, CaCl 2 in silica gel composite sorbent was found to be the most efficient sorbent for water adsorption, resulting in a cycle COP equal to 0.6-0.8 (T e = 5 • C, T c = 35 • C, and T des = 80 • C) evaluated experimentally in a silica gel single-bed adsorption chiller driven by 4-m 2 evacuated tube collectors under the climatic conditions of Baghdad, Iraq.…”

Section: Introductionmentioning

confidence: 99%

Performance Results of a Solar Adsorption Cooling and Heating Unit

et al. 2020

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The high environmental impact of conventional methods of cooling and heating increased the need for renewable energy deployment for covering thermal loads. Toward that direction, the proposed system aims at offering an efficient solar powered alternative, coupling a zeolite–water adsorption chiller with a conventional vapor compression cycle. The system is designed to operate under intermittent heat supply of low-temperature solar thermal energy (<90 °C) provided by evacuated tube collectors. A prototype was developed and tested in cooling mode operation. The results from the testing of separate components showed that the adsorption chiller was operating efficiently, achieving a maximum coefficient of performance (COP) of 0.65. With respect to the combined performance of the system, evaluated on a typical week of summer in Athens, the maximum reported COP was approximately 0.575, mainly due to the lower driving temperatures with a range of 75 °C. The corresponding mean energy efficiency ratio (EER) obtained was 5.8.

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“…Adsorptive Heat Transformation (AHT) is just at the interface between thermal and chemical engineering as the final goal is a heat conversion, whereas the specific means is a thermally driven adsorption process or chemical reaction [1]. This fast developing technology [2][3][4] aims to utilize renewable sources of heat that are deemed to replace fossil fuels soon.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Working Fluids for a New “Heat from Cold” Cycle

Girnik

Tokarev

Aristov

2020

Entropy

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Adsorptive Heat Transformation systems are at the interface between thermal and chemical engineering. Their study and development need a thorough thermodynamic analysis aimed at the smart choice of adsorbent-adsorptive pair and its fitting with a particular heat transformation cycle. This paper addresses such an analysis for a new “Heat from Cold” cycle proposed for amplification of the ambient heat in cold countries. A comparison of four working fluids is made in terms of the useful heat per cycle and the temperature lift. The useful heat increases in the row water > ammonia ≥ methanol > hydrofluorocarbon R32. A threshold mass of exchanged adsorbate, below which the useful heat equals zero, raises in the same sequence. The most promising adsorbents for this cycle are activated carbons Maxsorb III and SRD 1352/2. For all the adsorptives studied, a linear relationship F = A·ΔT is found between the Dubinin adsorption potential and the driving temperature difference ΔT between the two natural thermal baths. It allows the maximum temperature lift during the heat generation stage to be assessed. Thus, a larger ΔT-value promotes the removal of the more strongly bound adsorbate.

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Simulation and design of a solar driven thermochemical refrigerator using new chemisorbents

Cited by 13 publications

References 18 publications

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Performance Results of a Solar Adsorption Cooling and Heating Unit

Thermodynamic Analysis of Working Fluids for a New “Heat from Cold” Cycle

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