The condensation heat transfer characteristics of nonazeotropic mixtures R1234yf and R32 (mass fractions of 0.52:0.48 and 0.77:0.23, respectively) inside a horizontal smooth tube (inner diameter 4 mm) were experimentally studied at mass fluxes ranging from 100 to 300 kg/m s. A prediction model for the forced convective condensation heat transfer characteristics of nonazeotropic refrigerant mixt...

Due to the dependence of boiling heat transfer rate on heat flux, saturation pressure, mass flux and refrigerant quality, efforts made to increase heat transfer rate often cause further drop in refrigerant saturation pressure. In this study, entropy generation mechanisms associated with two-phase flow in smooth evaporator tube subject to constant surface heat flux are investigated. Refrigerant ...

The Cryogenic Carbon CaptureTM (CCC) process is a retrofit, post-combustion technology that desublimates CO2 in the flue gas and produces a separate liquid CO2 product. This project focuses on the energy-storing version of this process, CCC ESTM. During off-peak hours, CCC ESTM generates more refrigerant than is needed for the process, which is stored in an insulated vessel as a liquid at the l...

The rotary compressor accumulator with pre-charged oil has already been developed and the concept published.[I] Compared to the conventional accumulator, the new accumulator differentiates itself from the conventional one in that the new accumulator is pre-charged with a pre-determined amount of oil. It offers advantages as a conventional accumulator attached to rotary compressor. This paper no...

This paper presents the development of the low cost liquid pump. The rotary compressor developed as the gas compressor for the residential air-conditioner was converted into the liquid refrigerant pump. Problems of the liquid refrigerant pump are the reliability assessment of sliding parts and the reduction of the noise generated by discharge pulsation in this development. Therefore some modifi...

This paper presents the experimental performance analysis of a window air conditioner using two refrigerants R22 and R410A.The effect of the different parameters of performance analysis (refrigeration capacity, COP, compressor power ,pressure ratio ) were investigated for various evaporating temperature and ambient temperature. .The result shows that refrigerant R22 is better than R410A in case...

While the mass of refrigerant contained in a vapor compression cycle has a significant effect on the cycle’s power consumption, conventional cycle architectures cannot optimize energy efficiency by varying the mass as ambient conditions and operational requirements change. This paper proposes a new system architecture that allows the refrigerant mass circulating in the system to be modulated ov...

There currently exists a large number (millions) of automobiles with air conditioning systems designed to use CFC-12 as the refrigerant along with plans to produce ~uch systems into the 1992-1995 time frame. During the 1992-1995 period, new production will transition to HFC-134a refrigerant based systems or other technologleS which offer zero or llttle ozone depletion. CFC-12 based systems will...