2009, Volume 12, Issue 23+24
Irreversibility Analysis of Chiller Coupled in Hydrogen Isotopes Separation Plant
National Institute for Research and Development for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, Uzinei Street no. 4, P.O. Box Raureni 7, 240050, Ramnicu Valcea, Romania
In real conditions the processes of refrigeration cycles, are accompanied by internal and external irreversibility, which have the effect of consumption need of work, higher than ideal for cold cycle, characterized by the absence of irreversibility. The most representative irreversibility of the refrigeration cycles are:
- External irreversibility due to heat transfer at finite temperature differences;
- Internal irreversibility due to friction, turbulence, mixing, etc..
As the coolant temperature is closer to ambient temperature, the cooling efficiency is higher. Another disadvantage of using refrigeration efficiency in qualitative analysis of refrigeration cycles is that not take account of irreversibility that occurs in refrigeration processes. Reasons presented below, will be considered the irreversibility and losses from them and will introduce the concept of exergetic efficiency, refrigeration cycle performance indicator that takes into account both the environmental temperature cooled, and the environment, and losses due to thermal processes manifested by irreversibility of component refrigeration cycles.
Refrigeration efficiency, irreversibility, heat transfer.
Tag search Refrigeration efficiency irreversibility heat transfer