THERMODYNAMIC MODELING OF A PULSE TUBE REFRIGERATION SYSTEM
Thermodynamic model of the pulse tube refrigeration (PTR) system has
been developed based on
the ideal gas behaviour to study the cooling effect at
the cold end of the refrigerator. Compression
and expansion processes of the gas column have been assumed to be isothermal. Mass flow in the regenerator has
been evaluated through Ergun's law. Mass flow through the orifice and double
inlet valve has been assumed a nozzle flow with a correction factor. Model predicted results have been validated with in-house
experimental results as qualitative basis. Model predicted results in compression and
expansion processes are also validated with that of the experimental data.
Model predicted results are presented to understand the basic phenomenon for
the refrigeration effect in various pulse tube refrigerators (BPTR, OPTR and
DIPTR). Time duration for expansion process is more than the compression
process in case of OPTR and DIPTR, which leads to lower pressure during the
expansion and more cooling capacity obtained compared to the BPTR. A distinct comparison among three types of PTRs has been done based
on the work done at the
cold end. It has been clearly observed that a DIPTR
shows better cooling capacity compared to OPTR or BPTR.
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- Başlangıç: 2015
- Yayıncı: YILDIZ TEKNİK ÜNİVERSİTESİ