A definition of near-critical region based on heat capacity variation in transcritical heat exchangers

被引：5

作者：

Trela, Marian ^{[1
]}

Kwidzinski, Roman ^{[1
]}

Butrymowicz, Dariusz ^{[1
]}

机构：

[1] Polish Acad Sci, Szewalski Inst Fluid Flow Machinery, Fiszera 14, PL-20231 Gdansk, Poland

来源：

ARCHIVES OF THERMODYNAMICS | 2011年 / 32卷 / 02期

关键词：

Critical thermodynamic state; Near-critical region; Heat transfer; Specific heat capacity;

D O I：

10.2478/v10173-011-0009-1

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In the paper, a method for determination of the near-critical region boundary is proposed. The boundary is evaluated with respect to variations of specific heat capacity along isobars. It is assumed that the value of specific heat capacity inside the near-critical region exceeds by more than 50% the practically constant value typical for fluids under normal conditions. It appears that large variations of heat capacity are also present for high-pressure subcritical states sufficiently close to the critical point. Therefore, such defined near-critical region is located not only in supercritical fluid domain but also extends into subcritical fluid. As an example, the boundaries of the near-critical region were evaluated for water, carbon dioxide and R143a.

引用

页码：55 / 68

页数：14