Analysis of pinch point in liquid–vapour heat exchanger of R134a–DMAC vapour absorption refrigeration system

Roy, Subhadip; Maiya, M.P.

doi:10.1016/j.applthermaleng.2011.09.002

Cited by 10 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another study of R134a-DMAC-based vapor absorption refrigeration system used for sub-zero temperature applications by varying various operating parameters such as rectifier efficiency, evaporator temperature and generator temperatures revealed that performance of LVHX increases with a decrease in evaporator temperature as well as rectifier efficiency. However, the rectifier efficiency also influences the heat transfer which helps in sizing the system [10]. Again, an experimental investigation of 1TR compact absorber bubble absorption system using R134a-DMF was carried out to analyze the heat and mass transfer characteristics [11], and the results obtained revealed that heat and mass transfer effectiveness of absorber is better at lower circulation ratios and higher generator temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic optimization and chemical exergy quantification for absorption-based refrigeration system

Gupta

Anand

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

The present article suggests a thermodynamic analysis of flat-plate collector-based single-effect ammonia-water vapor absorption refrigeration system. The investigation involves the development of numerical and computational model based on physical and chemical exergies for the analysis of single-effect absorption systems. The investigation revealed that various operating parameters influence COP, exergy loss in different components as well as exergy efficiency. The COP cooling , COP heating and exergy efficiency show a decreasing trend with an increase in the generator temperature (60-100°C) and lie in the range of 0.398-0.435, 1.39-1.43 and 0.1421-0.2975, respectively. The COP cooling and COP heating show an increasing trend with an increase in the evaporator temperature, whereas exergy efficiency shows a decreasing trend with an increase in the evaporator temperature. However, The COP cooling , COP heating and exergy efficiency show a decreasing trend with an increase in absorber and condenser temperature. The variation in physical ðW PH loss Þ and chemical exergy losses ðW CH loss Þ with ambient temperature has also been discussed in the analysis. It is noticed that the highest percentage of non-dimensional physical and chemical exergy losses are found to be in the generator. The second worst component from the non-dimensional physical and chemical irreversibility viewpoints is the absorber, followed by solution heat exchanger, evaporator and condenser.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermodynamic optimization and chemical exergy quantification for absorption-based refrigeration system

Gupta

Anand

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…In another study, a detailed analysis of a liquid-vapor heat exchanger (LVHX) in a R134a-DMAC vapor absorption refrigeration system for sub-zero temperature applications by varying various operating parameters revealed that an increase in importance of LVHX with a decrease in evaporator temperature as well as rectifier efficiency. However, rectifier efficiency also influences the heat transfer which helps in sizing the system [25]. Again, an experimental investigation of a 1TR compact absorber bubble absorption system using R134a-DMF was carried out to analyze the effect of various operating parameters on heat and mass transfer effectiveness, overall heat transfer coefficient and volumetric mass transfer coefficient and the potential outcomes revealed that heat and mass transfer effectiveness of absorber is better at lower circulation ratios and higher generator temperatures [26].…”

Section: Introductionmentioning

confidence: 99%

Variable Capacity Absorption Cooling System Performance for Building Application

Anand¹

2018

Journal of Thermal Engineering

View full text Add to dashboard Cite

The increasing energy costs and environmental awareness call for a shift towards some interesting energy alternatives preferably the use of renewable energy. The present study investigates the impact of varying cooling capacity and other operating parameters in a single-effect absorption refrigeration system, using the concept of energy and exergy as a building heating/cooling alternative. The solar heat is used as an input to the generator of absorption refrigeration system. The results obtained from investigation revealed that variation in cooling capacity influences coefficient of performance (COP), exergy loss in different components as well as exergy efficiency. The values of COPcooling and COPheating lies in the range of 0.71-0.89 and 1.71-1.89 respectively for variations in cooling capacities ranging from 1 TR to 20 TR at maximum generator temperature of 80 o C. However, exergy efficiency of the system lies in the range of 0.32-0.41 for same variation in cooling capacities. It has also been established that an increase in evaporator temperature and at maximum cooling capacity both COPcooling and COPheating shows an increasing trend. The exergy efficiency also shows maximum value at the highest cooling capacity at a particular evaporator temperature which further with an increase in evaporator temperature shows a decreasing trend. The irreversibility behavior in all the components i.e., solution heat exchanger, absorber, generator, evaporator and condenser shows an expected trend with the variation in cooling capacity. Hence, use of the above mentioned system as a heating and/or cooling alternative for buildings is suggested.

show abstract

Theoretical and experimental investigations on the changing regularity of the extreme point of the temperature difference between zeotropic mixtures and heat transfer fluid

Zheng

Song

Zhao

2013

Energy

View full text Add to dashboard Cite

Analysis of pinch point in liquid–vapour heat exchanger of R134a–DMAC vapour absorption refrigeration system

Cited by 10 publications

References 15 publications

Thermodynamic optimization and chemical exergy quantification for absorption-based refrigeration system

Thermodynamic optimization and chemical exergy quantification for absorption-based refrigeration system

Variable Capacity Absorption Cooling System Performance for Building Application

Theoretical and experimental investigations on the changing regularity of the extreme point of the temperature difference between zeotropic mixtures and heat transfer fluid

Contact Info

Product

Resources

About