Jur. Khan et Sm. Zubair, Design and rating of dedicated mechanical-subcooling vapour compression refrigeration systems, P I MEC E A, 214(A5), 2000, pp. 455-471
Citations number
11
Categorie Soggetti
Mechanical Engineering
Journal title
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
Subcooling of the refrigerant at the exit of the condenser in a vapour comp
ression refrigeration system allows the refrigerant to enter the main cycle
evaporator with a lower quality and thus allows the refrigerant to absorb
more heat in the evaporator, thereby improving the coefficient of performan
ce (COP) of the system. In a dedicated mechanical-subcooling vapour compres
sion refrigeration system, the subcooling is performed by utilizing a small
dedicated vapour compression refrigeration cycle. This cycle is coupled to
the main cycle at the exit of the condenser. In this paper, thermodynamic
models of the dedicated mechanical-subcooling systems are developed to simu
late the actual performance of the system, particularly with respect to the
subcooler saturation temperature in addition to the heat exchanger areas.
It is demonstrated that the performance of the overall cycle is improved ov
er the corresponding simple cycle and this improvement is found to be relat
ed to the refrigerant saturation temperature of the subcooler. The models a
re also used to predict an optimum distribution of the total heat exchanger
area between the evaporator and condenser.