Date

2015

Author

Korkmaz, Alper

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In this thesis study, the theoretical design phases and experiments are performed about the air conditioning unit for a specific military vehicle, which is designed to be driven by an Auxiliary Power Unit (APU) system. The purpose is to determine the vapor compression refrigeration cycle characteristics under different load conditions on both the evaporator and the condenser as well as observe the particular mass flow rates considering the vapor and liquid phases of the refrigerant. Additionally, all experiment results are compared in terms of pressures, temperatures, relevant mass flow rates as well as performance characteristics such as COP, volumetric, isentropic and exergetic efficiencies, condenser heat rejection rate, evaporator cooling capacity and compressor work. The APU systems are commonly used in military vehicles to power the any required units/systems, desired to run externally. Details of the APU system are explained in the following chapters. In present study, APU is purposed to run the compressor of the A/C system. Accordingly, A/C system has also other main components such as; evaporator unit with expansion valve and receiver-filter-dryer, and condenser module. Considering these, the thermodynamic cycle analysis of the whole A/C system is conducted as well as componentwise analysis. In the tests, the temperatures and the pressures at the inlet/outlet of the components are recorded. In addition, mass flow rates in the both high-pressure (liquid) and low-pressure (vapor) sides are observed. All these data are internally compared according to the experiments results to observe the efficiency of refrigeration vapor compression cycle as well as for better understanding the dynamics of the A/C system. In conclusion, test setup is prepared to perform six different load configurations on the evaporator and condenser, and relevant results are presented accordingly.

Subject Keywords

Air conditioning., Compressors., Evaporation control., Condensers (Vapors and gases)., Armored vehicles

URI

http://etd.lib.metu.edu.tr/upload/12618848/index.pdf
https://hdl.handle.net/11511/24769

Collections

Graduate School of Natural and Applied Sciences, Thesis