نتایج جستجو برای: r134a
تعداد نتایج: 509 فیلتر نتایج به سال:
The lubricant is a critical component of an automotive AJC system. Besides providing good lubricity, it must exhibit sufficient solubility in the refrigerant to ensure lubricant return to the compressor. Stability in the presence of the refrigerant, metals, and common contaminants such as air, water, and mineral oil is critical. The lubricant must also be compatible with the hoses and other ela...
In this work a previous steady-state model [1] of a hermetic reciprocating compressor has been improved using an unsteady-state analysis of the compression cycle which allows a direct computation of the heat, work and mass flow rates. The new model requires the geometry of the machine, refrigerant inlet temperature and pressure, vapour discharge pressure, electric and mechanical efficiencies as...
When the re:fiigerant R l34a is mixed with an ester oil and usea m compressor bearing lubrication, no EP action is experienced. The refrigerant contains no chlorine and the lubricant additives can not be chemically active like normal EP additives, not to deposit in and destroy the heat excha..>Jgers. The iubricant film thickness thus needs to be considerably larger for an Rl34a compressor beari...
Transient simulations of refrigeration cycles are crucial for evaluating new refrigerants. Previously developed transient simulation tool was capable of simulating refrigeration systems using refrigerants R22 and R134a and was validated with experimental data; however, incorporating non-traditional refrigerants such as R744 (carbon dioxide) change the cycle operation beyond the capabilities of ...
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