Integration of absorption and vapour-compression systems

Riffat, Saffa; Shankland, N.

doi:10.1016/0306-2619(93)90047-s

Cited by 20 publications

(7 citation statements)

References 7 publications

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“…S.B. Riffat N. Shankland [10] described the integration of different types of absorption systems with vapour-compression systems. The performances of the single-effect and double-effect series and the double-effect parallel continuous absorption systems and their integration with vapour-compression systems have been carried out.…”

Section: Literature Reviewmentioning

confidence: 99%

Thermal performance of multi cascaded vapour compression NH3H2O absorption systems for ultra-low temperature applications

Mishra¹

2020

IJREI

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In this paper, we propose three multi cascaded vapour absorption-compression refrigeration systems using low GWP ecofriendly refrigerants such as hydrocarbons, ethylene and R32 in ultra-low evaporator temperature cycle of -130 o C and R245fa and R32 in intermediate evaporator temperature cycle of -95 o C and HFO refrigerants and natural refrigerants to produce cooling capacity at -50 °C. The comparison of four cascaded systems were also carried out at -50 o C using HFC refrigerants with R717 refrigerant. It is found that multi cascaded vapour compression NH3H2O absorption systems using HFO-1234yf in medium temperature cycle and R245fa in intermediate temperature cycle and R32 in ultra-low temperature cycle significantly improve the thermodynamic first and second law performances as compared to simple NH3H2O vapour absorption refrigeration systems. It was also observed that by considering proper safety measure, the Hydrocarbon (R600a) worked well for ultra-low temperature applications for replacing R404a and R236fa

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Section: Literature Reviewmentioning

confidence: 99%

Thermal performance of multi cascaded vapour compression NH3H2O absorption systems for ultra-low temperature applications

Mishra¹

2020

IJREI

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“…Also concluded that the highest energy loss occurs in generator regardless of operating conditions and therefore it is most important component of the system. Garimella and Brown [15] developed a novel cascaded absorptioncompression system that coupled a single-effect LiBr/H2O absorption cycle and a subcritical CO2 vapor-compression cycle to generate low-temperature refrigerant (-40 °C).…”

Section: Vapour Absorption Refrigeration Systemsmentioning

confidence: 99%

Thermodynamic performance evaluation of triple effect H2O -Li/Br vapour absorption systems using multi cascading of vapour compression cycles for ultra-low temperature applications

Mishra¹

2019

IJREI

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Performance evaluation of triple effect LiBr-H2O vapour absorption systems using multi cascading of vapour compression systems using HFO-1234yf in medium temperature cycle for -50 0 C and R-245fa in intermediate temperature cycle for -100 0 C and R-236fa in low temperature cycle for -150 0 C ultra low temperature applications have been carried out . It is found that overall first law efficiency (COP_Overall) for 123K evaporator temperature using R236fa is less than the overall first law efficiency (COP_Overall) for 273K evaporator temperature using 245fa. However when continuous improvement in second law (exergetic) performances which caused continuous reduction in system exergy destruction ratio. The percentage improvement in first law efficiency (COP_Overall) is found using single stage cascade vapour compression refrigeration system (VCRS) is 7.8% and using multi (two stages) cascade VCRS is 13.45% and using multi (three stages) cascade VCRS is 10.15% for all 8 0 C of vapour absorption evaporator temperature. However the percentage improvement in second law efficiency (exergetic efficiency) is found using single stage cascade vapour compression refrigeration system (VCRS) is 80.8% and using multi (two stages) cascade VCRS is 116.5% and using multi (three stages) cascade VCRS is 156.2% for all 10 0 C of temperature overlapping. Similarly the percentage decreament in system exergy destruction ratio is found using single stage cascade vapour compression refrigeration system (VCRS) is 60.51 % and using multi (two stages) cascade VCRS is 72.85% and using multi (three stages) cascade VCRS is 82.55% for all 10 0 C of temperature overlapping with 8 0 C of evaporator temperature of VARS..

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“…Some efforts have been made to integrate absorption and vapour compression systems. Results show that some efforts were successful to achieve a good value of COP driven by solar energy (Riffat and Shankland, 1993) [8]. Salim Munther (2001) [9] in his theoretical study and analysis has claimed that exhaust heat energy is capable of powering and producing cooling effect upto 1.4 tons of refrigeration using VAC.…”

Section: Vapour Absorption Cyclementioning

confidence: 99%

Cooling of a Truck Cabin by Vapour Absorption Refrigeration System Using Engine Exhaust

Thakre¹

2014

IJRET

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Air conditioning cabin of a transport truck is a new concept in India and has not been addressed. But in summer, the temperature in some parts of India is very high and results in unbearable cabin temperatures. In such conditions, an air cooled cabin for transport truck is a necessity. It is observed that much work has not been done in the field of cabin cooling of transport truck. The available options in heat generated cooling have been critically reviewed. The vapour absorption refrigeration cycle is found to be suitable for automobile air cooling especially for transport trucks. The heat potential in the exhaust has been analyzed and found to be sufficient enough for powering the proposed air conditioning system. The significance of the work is that it will provide space cooling for the truck driver and thereby enhances his performance and efficiency without affecting performance of the engine essentially the fuel economy. Further the vapor absorption cycle use non CFC refrigerant and thereby have little effect on environment. The present work is focused towards the design and development of an air cooling system for the cabin of truck using waste heat from exhaust. This document gives information about how much important is waste heat and using this we can develop a refrigerant system without taking input from battery, also design is developed based on vapour absorption refrigeration system which demands for future. In this article, we design different parts of the system and there basics behind this. Also, we study thermodynamic analysis of ammonia vapour absorption refrigeration system. From this we can concluded that the power required is less as compare with vapour compression refrigeration system and also study advantages over this.

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Integration of absorption and vapour-compression systems

Cited by 20 publications

References 7 publications

Thermal performance of multi cascaded vapour compression NH3H2O absorption systems for ultra-low temperature applications

Thermal performance of multi cascaded vapour compression NH3H2O absorption systems for ultra-low temperature applications

Thermodynamic performance evaluation of triple effect H2O -Li/Br vapour absorption systems using multi cascading of vapour compression cycles for ultra-low temperature applications

Cooling of a Truck Cabin by Vapour Absorption Refrigeration System Using Engine Exhaust

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