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 A large size condenser has also been replaced by a compact loop heat pipe.
A Vapour Absorption Refrigeration System is able to use waste heat, which makes it very useful in the Energy Crisis. In this research work, as beginning a loop heat pipe (LHP) with different specifications are employed to re-use the heat that has been rejected in the widely used conventional condensers. The condensation after the generator occurs in as a flow condensation as it rejects heat to the evaporator of LHP. Hence by removing the conventional condenser or by reducing its size, it will drastically result in cost reductions. This research work finds that COP I increases by up to 80% due to the re-use of heat. Also due to the removal of the bulky anergy creating parts, the exergy losses are reduced and the COP II increases up to 30%. The size of the system reduces and the system becomes easy to operate.
The research work is based on the research done on the modification of vapor absorption refrigeration systems (VARS) by incorporating Loop Heat Pipes (LHP). A comparison of the performance enhancements of different effect systems namely single, double, half and triple effect systems is performed in this research work. The modification in the systems is brought in by replacing the condenser of the VARS systems by LHPs. It's shown through the simulations that intra cycle heat exchange increases with the change in design, materials of the LHP and operating temperatures. The COP I and COP II are maximum for triple effect system whereas the percentage increase in the performance is highest in double effect system 78% & 28%. Higher the generator temperature, higher is the heat utilization factor for the LHPs. The system becomes concise and flexible at the same time.
I. INTRODUCTION Loop Heat Pipe (LHP)is an evaporator-condenser that works on the thermo-siphon effect. It operates and transfers heat without any requirement of input work. It acts as a super-conductor owing to the high heat transfer rates related to the evaporation and condensation. The heat pipe is a wicked structure, outside of which the heat is absorbed by the working fluid of the LHP from the ambient and the fluid gets vaporized. This vapor passes through the porous wicked structure and moved towards the condenser of the LHP through the Vapor Line. The vapor rejects heat in the condenser and gets condensed. These condensates then move towards the Compensation Chamber (CC) connected to the evaporator of the LHP and gets accumulated there.
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