Designs of cooling systems that operate entirely on solar energy are
disclosed. Such cooling systems may be used in refrigeration and air
conditioning. According to one aspect of the designs, a solar energy
collecting device is disposed outdoor to collect solar energy. A first
heat-to-electricity pump operating on heated liquid is provided to
produce electricity. A storage tank is used to store heated water. A
second heat-to-electricity pump is disposed in the storage and operates
on the heated water to generate electricity. A cooling system operates on
at least three types of working fluids to achieve low temperature
evaporation and high temperature condensation to derive cooling effects.
A working unit powered by at least one of the first generator and the
second generator is provided to utilize the cooling effects from the
cooling system.