Performance studies on mechanical+adsorption hybrid compression refrigeration cycles with HFC 134a

Banker, Nitin D.; Dutta, Pradip; Prasad, Madhu; Srinivasan, Kandadai

doi:10.1016/j.ijrefrig.2008.03.009

Cited by 41 publications

(9 citation statements)

References 13 publications

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“…There exists another option of two stage hybrid compression consisting of thermal and mechanical compression. This has been proposed for refrigeration in general by Banker et al [21] and Koyama et al [22] for CO 2 air conditioning. Results of these additional compression methods will be published in an ensuing publication.…”

Section: Limitations Of Thermal Compression and Possible Solutionsmentioning

confidence: 99%

Solar driven carbon dioxide Brayton cycle power generation with thermal compression

Kumar

Dutta

Murthy

et al. 2016

Applied Thermal Engineering

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Solar thermal power generation by and large uses Rankine cycles with organic working fluids or steam when highly concentrated solar source is used. Brayton cycle is seldom used because the work of compression forms a major fraction of turbine output. We investigate removal of this lacuna by adopting thermal compression using the adsorption route. Here we propose a two source operated cycle with the low temperature source used for thermal compression and the high temperature source to increase the inlet temperature of the working fluid to the turbine. We adopt carbon dioxide as the working fluid in view of its excellent heat transfer properties and environmentally friendly disposition. Activated carbon is used as the adsorbent in the thermal compression process. It is shown that, though the First law thermal efficiency does not show the real merit of the cycle, the exergetic efficiency is substantially high even for low side operating pressures in the range of 15-25 bar. In particular, where the waste heat is available around 100 o C and concentrated solar power is available even at 200-300 o C, exergetic efficiencies in excess of 25 % can be realised. When other advantages such as dispensing with one whole segment of moving parts (compressor) are taken into account, the running costs of such a cycle can be so low that it would be a

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Section: Limitations Of Thermal Compression and Possible Solutionsmentioning

confidence: 99%

Solar driven carbon dioxide Brayton cycle power generation with thermal compression

Kumar

Dutta

Murthy

et al. 2016

Applied Thermal Engineering

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“…This is the main difference between the possibilities of contemporary industrial adsorption and absorption technologies. There is also scientific interest in hybrid sorption-compression cycles, their application however, has other aims and refrigerants than presented here (Banker et al, 2008;Garimella et al, 2011;Han et al, 2013;Zheng and Meng, 2012).…”

Section: Introductionmentioning

confidence: 99%

An innovative ecological hybrid refrigeration cycle for high power refrigeration facility

Cyklis¹,

Janisz²

2015

Chemical and Process Engineering

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Searching for new refrigerants is one of the most significant scientific problems in refrigeration. There are ecological refrigerants commonly known: H 2 O and CO 2 . H 2 O and CO 2 known as natural refrigerants, but they have problems:a high freezing point of H 2 O and a low triple point of CO 2 . These problems can be solved by the application of a hybrid sorption-compression refrigeration cycle. The cycle combines the application possibility of H 2 O in the high temperature sorption stage and the low temperature application of CO 2 in the compression stage. This solution gives significant energy savings in comparison with the two-stage compressor cycle and with the one-stage transcritical CO 2 cycle. Besides, the sorption cycle may be powered by low temperature waste heat or renewable heat. This is an original idea of the authors. In the paper an analysis of the possible extension of this solution for high capacity industrial refrigeration is presented. The estimated energy savings as well as TEWI (Total Equivalent Warming Impact) index for ecological gains are calculated.

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“…Cyklis [9] proposes a cascade system of Lithium Bromide-Water absorption with vapour compression heat pump using CO 2 refrigerant (R744) for freezing application (À10°C to À20°C) Ma et al [10] proposed hybrid consists of three sub-systems for air conditioning application (21°C indoor air temperature versus 34°C outdoor air temperature): a liquid desiccant (Lithium Bromide solution) is associated in cascade with a vapour compression heat pump which is then operating in parallel with a solar driven Silica gel-Water adsorption chiller. There are some publications on adsorption hybrid systems but it appears that the research is limited to modelling of thermodynamic cycles of activated carbon thermal compressor combined in series with mechanical compressor operating as a booster and vice versa and often using R134a as refrigerant [11,12]. As part of this research project (EP/J000876/1), four hybrid configurations as illustrated in Fig.…”

Section: Background and Introductionmentioning

confidence: 99%

Prototype of hybrid refrigeration system using refrigerant R723

Lychnos

Tamainot-Telto

2018

Applied Thermal Engineering

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h i g h l i g h t sA prototype of 10 kW cooling hybrid refrigeration machine is described. The machine combines both adsorption and conventional systems. The ammonia blend R723 is the refrigerant for both sub-systems. The preliminary test results show a total cooling production of 6 kW. a r t i c l e i n f o t r a c tA proof of concept 10 kW cooling capacity hybrid refrigeration machine, designed and built at University of Warwick, is described in this paper. The hybrid system uses ammonia mixture R723 (40% Dimethyl ether, 60% Ammonia) which is compatible with conventional refrigeration copper alloy (Cu90Ni10) and environmentally friendly. It combines sorption (thermal) and conventional vapour compression (electrical) technology in two separate refrigerant loops. Shell and tubes adsorption generators with activated carbon -R723 pair are used as thermal compressor while a semi hermetic reciprocating compressor is used in the conventional vapour compression loop. The hybrid machine is designed as water chiller with an evaporation temperature of 5°C and condensing temperature of 40°C. The preliminary experimental tests are mainly designed to check the system operational functionality. Those preliminary results show a maximum cooling production of 6 kW with 2/3 from mechanical compression and 1/3 from thermal compression (adsorption cycle). Further additional work is yet to be carried in order to establish full and detailed performance of prototype under development.

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Performance studies on mechanical+adsorption hybrid compression refrigeration cycles with HFC 134a

Cited by 41 publications

References 13 publications

Solar driven carbon dioxide Brayton cycle power generation with thermal compression

Solar driven carbon dioxide Brayton cycle power generation with thermal compression

An innovative ecological hybrid refrigeration cycle for high power refrigeration facility

Prototype of hybrid refrigeration system using refrigerant R723

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