Parokompressionnye kholodil'nye mashiny s pereokhladitelem zhidkogo khladagenta posle kondensatora pered drosselirovaniem

One of the effective modes of improvement of a refrigeration coefficient of vaporcompression machines (first that operating on a simple vaporcompression cycle) is subcooling of a liquid refrigerant after a condenser by an external source of cooling before refrigerant throttling in a flow control valve. The author derived the expression of minimal work in refrigerating cycles using subcooling on the basis of the first and the second principles of thermodynamics; also the efficiency of application of this method for low (in terms of R134a) and high (in terms of ammonia) specific heat of evaporation is compared in the article. The subcooling efficiency depending on external conditions (condensation, boiling temperatures and initial temperature of an external source of cooling) is estimated qualitatively. The subcooling always increases the thermodynamic efficiency of the vaporcompression cycle; this increase may be of ~25% for refrigerants at low evaporation heat at that.

минимальная работа холодильного цикла с переохлаждением, термодинамическая эффективность, переохлаждение хладагента, парокомпрессионные холодильные машины