The solar-assisted cascade refrigeration system includes the solar-driven vapor absorption refrigeration
unit and electricity-powered vapor compression refrigeration unit. Refrigerant water and solution
reservoirs are used as energy storage units to store solar energy, in order to keep the system operating
continuously without sunlight. COP of the cascade refrigeration system is up to 6.1 with the solar
intensity of 700W/m2, outdoor air temperature of 35℃ and chilled water supply temperature of 7℃.
Power consumption of the cascade refrigeration system is 50% lower than that of the conventional vapor
compression refrigeration (CVCS) in the cooling mode. The COP of the new vapor compression
refrigeration system (VCRS) increases as sunlight becomes intense. COP of the cascade refrigeration
system is up to the maximum when COP of the conventional vapor compression refrigeration system is
minimal.