Development and studies of low capacity adsorption refrigeration systems based on silica gel-water and activated carbon-R134a pairs

Pinto, Samson Paul; Karanam, Praveen; Raghavendra, B. G.; Boopathi, V.; Mathad, Prafulkumar; Behera, Upendra; Kasthurirengan, S.

doi:10.1007/s00231-018-2441-0

Cited by 7 publications

(7 citation statements)

References 30 publications

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“…If the cold produced in the evaporator is not taken away, the evaporator attains its lowest temperature, which is referred to as a "no-load condition," during which no refrigeration power is produced. Refrigeration power is produced if the system is put under an external heat load by circulating the water via evaporator coil where the water decreases in its temperature by taking away the cooling effect produced in the evaporator and this is called load condition [14]. Pumps and control valves are provided in the circuit at different places to circulate the hot and cold fluids as desired.…”

Section: Methodsmentioning

confidence: 99%

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Experimental and Simulation Study of a Solar Assisted Two Bed Adsorption Refrigeration System Using Activated Carbon-Methanol

Krishnappa,

Kapilan,

Kasthurirengan

et al. 2023

IJHT

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Adsorption refrigeration systems have gained lot of attention nowadays due to their ease of operation with low-grade waste or solar heat energy by using environmentally friendly refrigerants but yet unable to compete with the traditional vapor compression systems. Hence, the research activities in this area are still on to address the technological, economic, and environmental issues. According to the literature the working pair used such as silica gel-water, activated carbon-methanol, activated carbon-ethanol, zeolite-water etc. along with driving source temperature as well as the adsorption capacity of working pairs significantly affects the performance of adsorption cooling system. Also it has been noted that the research related to adsorption cooling is rarely found in India. Consequently, tests are carried out in the current work on a solar-assisted two-bed adsorption refrigeration system using activated carbon and methanol as the working pair to produce the cooling effect and the system performance is evaluated. Also the simulation studies are made using MATLAB to know the dynamic behavior of the system with a lumped parameter simulation model. The results of the simulation and experiment are found comparable. From the study it is found that the adsorption system successfully produces the cooling effect with a heat source of 80-85℃ temperature and under no load condition during the experiment, the lowest temperature of 6℃ was observed in the evaporator against a predicted value of 4.9℃ from the simulation. The cooling power and COP obtained from the experiment and the simulation amounts to 250 W, 0.29 and 280 W, 0.35 respectively.

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Section: Methodsmentioning

confidence: 99%

“…Pinto et al [14] have studied a two-bed Silicagel water based and four bed activated carbon-R134a based adsorption cooling systems. The simulation studies are also made using a lumped parameter simulation model using MATLAB.…”

Section: Figure 3 Adsorption Cooling System With Two Beds [12]mentioning

confidence: 99%

Experimental and Simulation Study of a Solar Assisted Two Bed Adsorption Refrigeration System Using Activated Carbon-Methanol

Krishnappa,

Kapilan,

Kasthurirengan

et al. 2023

IJHT

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“…On the other hand, those samples with less micropore content likely describe their sorption behavior via predominant sorbate−sorbate interactions showing the initial uptake of micropore filling followed by an additional stage of adsorption that occurs after an inflection point filling in the larger pores. Specifically, three samples (HPC-1, HPC-2, and KB-600JD) have the typical profiles of a fast R134a uptake with 25−30 wt % up to a P/P o ∼0.05, as standard active carbons usually presented (Figure 2b), 43 but, instead of an extremely diminishing rate at P/P o ∼0.2 (∼1.2 bar) of the uptake rate, R134a uptake will further increase from an inflection point at P/P o ∼0.5 (∼3 bar) with rough ∼80 wt % uptakes, until the highest uptake (150 wt %) is reached at the final point (P/P o = 0.9, ∼5.5 bar) in the investigated range without an equilibrium platform. Interestingly, HPC-3 shows exceptional R134a uptake in the two mentioned pressure ranges.…”

Section: ■ Introductionmentioning

confidence: 92%

Structure–Property Correlation of Hierarchically Porous Carbons for Fluorocarbon Adsorption

Shen

Estevez

Barpaga

et al. 2021

ACS Appl. Mater. Interfaces

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Although traditional commercially available porous carbon–fluorocarbon working pairs have shown promising applicability for adsorption cooling, advancements in engineered carbons may further improve the performance. Moreover, insights into structure–property relationships that target higher sorption capacities within these synthesized carbons may guide such materials’ future design. We utilized hierarchically porous carbons (HPCs), synthesized with colossal microporous and mesoporous content characterized by high surface areas (up to 2689 m2/g) and pore volume values (up to 10.31 cm3/g) toward fluorocarbon R134a adsorption. This unique pore topology leads to exceptional R134a uptake, ∼250 wt %, outperforming the highest uptake carbon material to date, Maxsorb III (∼220 wt %). Material characterizations reveal that the outstanding R134a capacity may be attributed to textural properties and oxygen-terminated functional groups more than graphitization of the material. Most importantly, HPCs are efficiently utilized in a two-bed model chiller device, where the performance shows excellent working capacity (105 wt %, ∼2 times the value of reported carbon materials/R134a). Fluorocarbon adsorption on HPCs also displays fast kinetics (equilibrium time: ∼2 min) mainly driven by physical adsorption (Qst: ∼27 kJ/mol), characteristic of swiftly reversible behavior adsorption–desorption behaviors. This work provides a fundamental understanding of the applicability of HPCs/R134a working pair for adsorption cooling.

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“…Statistics shows that 15% of the electricity generated is utilized for refrigeration and air-conditioning processes alone across the world. Hence, it is very important to explore nature friendly cooling systems which utilize refrigerants of no negative impact and use low grade energy for their operation [1][2].…”

Section: Introductionmentioning

confidence: 99%

“…Researchers such as Samson Paul Pinto et al [2], Dim Dim Kumar et al [14], M Gado et al [15], Saurav Mitra et al [16], Mahsa Sayfikar et al [17], Begum et al [18], Pan et al [19] have studied silica gel-water based adsorption chiller. There are studies on solar based adsorption by Kairul Habib et al [20], Wissam H. Khaleel [21], N. V. Ogueke et al [22], Khattab et al [23], Hassan et al [24], Mohammed Ali Hadj Ammar et al [25], etc.…”

Section: Introductionmentioning

confidence: 99%

Comparative Studies on Solar Assisted Silica Gel- Water and Activated Carbon-Methanol Based Adsorption Refrigeration System

K¹,

Kapilan²,

Kasthurirengan

2022

jmmf

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The ever increasing cooling demand and the environmental concern have made in search of alternative refrigeration and for the last few decades, the energy efficient cooling systems utilizing refrigerants of no negative impact on the environment are explored. In this view, heat-driven refrigeration systems like vapour adsorption refrigeration is one of the favourable alternatives. Though adsorption cooling devices are capable of producing desirable cooling effect with a relatively low heat source temperature, their coefficient of performance (COP) is low in comparison with the existing cooling technologies. Therefore, to solve the environmental, economic and technical issues, the research is still in progress in this area. It is evident from the literature that, the performance of adsorption refrigeration depends on selecting the working pair such as silica gel-water, activated carbon-ammonia, zeolite-water etc. and driving temperature. This paper presents the comparison of performances of solar assisted twin bed adsorption refrigeration which employs silica gel-water and activated carbon-methanol as working pairs. Results are found to be good with continuous cooling in the evaporator using low temperature source of heat and the lowest temperature achieved in the evaporator for silica gel-water is 11°C and for activated Carbon-Methanol is 2°C. The coefficient of performance obtained is higher for silica gel based system than that of Activated carbon based system.

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Development and studies of low capacity adsorption refrigeration systems based on silica gel-water and activated carbon-R134a pairs

Cited by 7 publications

References 30 publications

Experimental and Simulation Study of a Solar Assisted Two Bed Adsorption Refrigeration System Using Activated Carbon-Methanol

Experimental and Simulation Study of a Solar Assisted Two Bed Adsorption Refrigeration System Using Activated Carbon-Methanol

Structure–Property Correlation of Hierarchically Porous Carbons for Fluorocarbon Adsorption

Comparative Studies on Solar Assisted Silica Gel- Water and Activated Carbon-Methanol Based Adsorption Refrigeration System

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