Optimization of Vapour Absorption System Using Heat Pipes

Abstract

Heat pipe was developed by NASA for space applications, and this device can be used in simple refrigeration systems, which will have a great impact on the size of the system. Multiple working fluids can be used in the heat pipe along with the different materials in the designs of the loop heat pipe (LHP). In this research it is aimed to remove the condenser of a Vapour Absorption Refrigeration System (VARS) and to use a flow condensation instead. The heat released during the condensation of the rich refrigerant is used to evaporate the working fluid in the LHP. The condenser of the LHP will be in contact with the solution leaving the absorber. Thus utilization of the waste heat in the condenser can be done. Other systems have also been connected with each other to have a combined effect. The increase in COP will be recorded by simulation and the exergy loss can be reduced due to heat transfer while heat transfer if condenser. A large size condenser has also been replaced by a compact loop heat pipe.

Comparative Study of Improvements in Multiple Effect Vapor Absorption Systems using Loop Heat Pipes

“…Gulshan Sachdeva et al(2014) performed an exergy analysis of VAR system using LiBr-H2O as working fluid with the modified Gouy-Stodola approach [10]. Ankit Dwivedi et al (2018) through computer simulations of the replacement of condensers from single, double, half &triple effect VARS, showed the improvements in the performance in COP I and COP II [11]. Based on the research work presented in the section, the comparison of the improvements in the performance parameters in all the different type of VARS based on the effect is due.…”

Performance Enhancement Analysis of Double Effect Vapor Absorption System Using Loop Heat Pipes

“…This low heat resistance is because of little effective length of heat exchange through strong porous wick walls. [35] The LHPs have an inverted wick (Fig 2), and the vapors are located adjacent to the heated surface. These wicks are prepared by power metallurgy.…”

“…Circumferential and axial grooves are required to generate flow channels for the vapors flow which can be machined in the wick, or to the evaporator body. Fig 2: Porous Wick in the LHP [35] .…”