Two stage ecological hybrid sorption–compression refrigeration cycle

Cyklis, Piotr

doi:10.1016/j.ijrefrig.2014.08.017

Cited by 26 publications

(14 citation statements)

References 25 publications

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“…Nevertheless the periodic work of the adsorption chiller does not affect the LT stage CO2 condensation [7]. This is due to the thermal capacity of the condenser.…”

Section: Doi: 101051/ 00008 (2016)mentioning

confidence: 98%

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The hybrid two stage anticlockwise cycle for ecological energy conversion

Cyklis

2016

E3S Web Conf.

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Abstract. The anticlockwise cycle is commonly used for refrigeration, air conditioning and heat pumps applications. The application of refrigerant in the compression cycle is within the temperature limits of the triple point and the critical point. New refrigerants such as 1234yf or 1234ze have many disadvantages, therefore natural refrigerants application is favourable. The carbon dioxide and water can be applied only in the hybrid two stages cycle. The possibilities of this solutions are shown for refrigerating applications, as well some experimental results of the adsorption-compression double stages cycle, powered with solar collectors are shown. As a high temperature cycle the adsorption system is applied. The low temperature cycle is the compression stage with carbon dioxide as a working fluid. This allows to achieve relatively high COP for low temperature cycle and for the whole system.

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“…Nevertheless the periodic work of the adsorption chiller does not affect the LT stage CO2 condensation [7]. This is due to the thermal capacity of the condenser.…”

Section: Doi: 101051/ 00008 (2016)mentioning

confidence: 98%

“…In this case the HT cycle based on adsorption is more applicable because it may operate with the desorption heat source as low as 55 o C [7,8]. The concept of the hybrid cascade refrigeration system with the adsorption cycle is presented in figure 3.…”

Section: Hybrid Double Stage Cyclementioning

confidence: 99%

The hybrid two stage anticlockwise cycle for ecological energy conversion

Cyklis

2016

E3S Web Conf.

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“…In the Laboratory of Thermodynamics and Measurements of Thermal Machines at the Cracow University of Technology a test stand with hybrid refrigeration adsorption-compression system has been designed and constructed [2]. The HT stage is the adsorption cycle based actually (after upgrading) on the eCoo unit from German manufacturer (SorTech AG).…”

Section: The Test Standmentioning

confidence: 99%

“…Compression and sorption systems are widely used in refrigeration and air conditioning systems for refrigeration and heat pumps cycles [2][3] [4][5] [6]. Restrictions for "F-gases" limits its application in such systems because of greenhouse and ozone depletion effect.…”

Section: Introductionmentioning

confidence: 99%

The control system of the ecological hybrid two stages refrigerating cycle

Cyklis

Duda

2016

E3S Web Conf.

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Abstract. The compression anticlockwise cycle is mostly used for refrigeration. However due to the environmental regulations, the use of classic refrigerants: F-gases is limited by international agreements. Therefore the combined compression-adsorption hybrid cycle with natural liquids: water/carbon dioxide working as the energy carriers is a promising solution. This allows to utilize the solar or waste energy for the refrigeration purpose. In this paper application of the solar collectors as the energy source for the adsorption cycle, coupled with the low temperature (LT) refrigerating carbon dioxide compression cycle is shown. The control of the system is an essential issue to reduce the electric power consumption. The control of the solar heat supply and water sprayed cooling tower, for the adsorption cycle re-cooling, is presented in this paper. The designed control system and algorithm is related to the LT compression cycle, which operates according to the need of cold for the refrigeration chamber. The results of the laboratory investigations of the full system, showing the reduction of the energy consumption and maximum utilization of the solar heat for different control methods are presented.

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“…These theoretical and experimental hybrid systems are reviewed thoroughly in literature [8]. 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].…”

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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Two stage ecological hybrid sorption–compression refrigeration cycle

Cited by 26 publications

References 25 publications

The hybrid two stage anticlockwise cycle for ecological energy conversion

The hybrid two stage anticlockwise cycle for ecological energy conversion

The control system of the ecological hybrid two stages refrigerating cycle

Prototype of hybrid refrigeration system using refrigerant R723

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