Solar cooling technologies using ejector refrigeration system
The analysis of the solar cooling systems showed that the ERS could be competitive with the sorption
refrigeration systems when it is required to produce cold on different temperature levels. In addition, the
COP of ERS can be 5-20% higher than the COP of sorption system if air-conditioner cooling capacity is
equal or higher than refrigeration cycle cooling capacity.
It is proved that SCBERS can be 20-40% more efficient than sorption systems and SCERS because the
COP of the upper stage utmost influences the reduced COP of the whole system. The article also presents
the proofs that highest COP values of solar ERS with flat-plate collectors occurred at the generation
temperatures in a range of 90-100°C. The COP of the solar ERS with evacuated tube collectors increase
rapidly in all generation temperature range up to a critical point. It is suggested to use flat-plate collectors
with the dynamic vacuum and simultaneously produce fresh water to increase the efficiency of the
cooling system and reduce the production costs.